Ls1 afr at idle. but also to temperature.

  • Ls1 afr at idle doesn't matter R to D, or 1, 2,3,D,3,2,1. My car is a '99 M6 LS1 pretty much stock with 45k miles on the odometer. 6, that number doesnt even move from Park to Drive or at RPM. 641whp/550tq on just 12lbs and 17*. Top. AFR. 6 - it can't adjust anymore than that and will throw a code. com is a forum community dedicated to the LS1 Pontiac GTO. reset everything again, to no avail. At startup the AFR will be the richest and then leans out as the coolant temperature increases. i had tried many things to legitimately lower it eg afr timing lean cruise etc. It starts great but after ~20 seconds the STFT's start to climb then in starts to surge, then the surging grows until it stalls. 40psi - 19. Just wondering what people have their target idle AFRs set to, with a large aggressive cam with overlap. Now it surges almost right at startup. I have my personal car set at 1175 at cold idle just to help the motor warm up a bit quicker. 7 afr. Come discuss mods, horsepower Hi All. I am really pleased with the throttle response and performance of the LS1 TB except for when I first start the car after it's been sitting overnight. Jack the timing up to 20* idle advance and trim the long term idle trims. 3 87*F AFR was 13. 0, then upon returning to idle in this state the remember value would be 2. The question is whether you are lean under load as that is when there can be a problem. I have a 3600 Fuddle converter in a I've tuned a couple of cars besides mine, and they all had similar cams, kpa at idle has been between 50-52kpa so far, at around 800rpm, base timing set at 17* on the idle cells. At idle it did seem to help the 'smoothness' of the idle (I know, very subjective). 644/. Right now in open loop, my AFR will vary from 13. Set Abuse Mode RPM, Abuse Mode TPS and Abuse Mode I think added somewhere on the order of 60* to the 500, 1000, and 1500 RPM areas. The afr at idle is 8. As you lean out the cruise and idle mixture, you will find that the engine's torque production drops off. Today i just finished another Goat with dart 225 heads and a 232/236 111lsa cam. Thanks for your input. Are you/lt1 map sensors comparable with ls1 map sensors? Offsets any different? At idle he's around 40-50kpa but at cruise with hardly any throttle he is at 80-90kpa. I'm working on dialing back the min injector pulsewidth to get the idle When logging you will see this as a jagged spark advance chart, most noticeable with cams at lower idle RPM’s where the spark advance generally oscillates between its My experience has me running between 12. Ignore this step for a standard transmission (M6) and continue to step 2. 5FDP. 5:1-18:1 at WOT. Why wasnt it maintaining the 14. 22753 I also notice that the AFR goes very rich Taking this course will give you a solid understanding of how and where to set the air fuel ratio when tuning any engine. 8. Use a delay of about 1/2 to 1 second. Then Advance timing at idle from 16-18* upwards to find the highest MAP while getting the lowest idle. 614"/. 588 on a 112 lobe sep, dual valve springs, LS1 intake, Hooker full length headers, qtp 3 inch Y, 3 inch Flowmaster cat back with 40 series muffler. My car was having idle issues. Because they are significantly different. When i had it tune the idle was 10. You want a steady idle range before going too far. A. 7 I also see your VE% Table numbers are a little high in the idle area. im not sure if that would make a difference or not. I see my wideband reading bounce into the 15's at idle on our car from time to time. Idle targets are typically 13. 624, the A/F at idle is around 17:1 A/F, I'm thinking it won't get much better, I believe it is not burning all the way, giving me the "lean" reading, although it stinks of fuel. Any ideas would be much appreciated. 7 AFR at idle. Wideband vs Narrowband sensors - A narrowband O2 sensor is only I would start by commanding a richer AFR under 1500 for the moment, try something around 14. At part throttle if you were running rich you would get a trouble code--the car's computer adjusts the AFR to 14. (edit to fix my mistake here, these are my map numbers currently) Remember your startup tune shouldn’t leave the garage without tweaking. It didn't do this in summer or autumn. who here has done a head swap only. View Profile The surge and inability to change my AFR is the major issue however. 576" 113+2 Usually if the duration is significant, you can't really go by the afr at idle. Black smoke = too rich afr Re: AFR Correction 1; what is the normal value @ idle? It's not an OTS map, it's a custom tune by Matt Miner. 3. Pulled plugs and they were black. 85 for WOT. I would then set the target idle speed to 1300rpm in the tune and manually tune the fuel table in that vertical column. Read EVERYTHING in this link, it applies to us. I used the VCM scanner to command 14. It has the coil pack conversion on his tpi motor. Sitting at idle, my timing was around 20 degrees retarded, and if I brought the RPM's up it got worse, as high as -35 or so. When the car was stock 10. The timer can vary from 50 seconds (hot engine) to 300 seconds (cold engine). A cammed car with a stock OFLA table will try to idle at an afr of 9:1 or richer. also, what are the best heads to get for an ls1? i heard trickflow or On a cold start the idle is very lean and eventually once the car heats up returns to normal. 7:1+- 06-25-2014 #3. This is my first large cam, I got the car to idle, but it likes the 17 AFR range. Target AFR at idle still at 13:6 but the shown (and Hello guys, I found that there is a huge split in air/fuel ratio bitween hood open (iat reading 60*F) and hood closed (iat reading 130*F) here are some readings i wrote done: IAT vs AFR @ idle 80*F AFR was 13. View Profile View Forum Posts Private Message Tuner Join Date Jun 2007 Posts 165. Depends on the fuel being used but idle AFR should be 14. 383--AFR Heads--12. 6 all the time at part throttle-- the LTFT's will adjust the AFR up to a point of -25/ +25 % in order to correct it to 14. Thinking of changing the Target AFR to something very lean (14. With enough duration, it can be off by almost a whole point, if using auto tune, you'll likely want to set it around 13. 1. No codes are being thrown and I have checked the fuel pressure and it holds steady at around 60-65 psi at idle and under load. At lower pressure (when revving in park or driving) it's stuck at about 10. I say AFR last because most people use closed loop, and closed loop keeps the AFR near stoich. 7 although i do see the changes Start aiming rich e. Fueling is fueling though. Adding a bunch of spark advance is just a STIT will move higher than this to maintain idle speed however, remembered idle value will not exceed this value (eg. When I come to a stop with the gear shifter in neutral the rpms will sometimes drop to 400 then raise to commanded 850 and back down again before it settles . Comp repaired or replaced that cam Ported LS1 intake (for now) Ported LS1 TB (I edited the IAC effective area to be the same as my 2000 TA). Running pure open loop with around a 16 AFR at idle on my wideband the car will come to a stop and idle perfectly. Here's why and What should my idle AFR be? Mostly stock LS1, seems to be idling about 10 to 1 which seems rich. Naturally aspirated LS1 with AFR 215 heads, Comp Cams 54-444-11 cam, FAST 92mm intake and NW 92mm TB, long tube headers with Dynomax race mufflers. 2 at cruise on all engines and 12. 6 to 14. Even after the AFR comes back to what I am commanding, the car still will not idle on its own like it was. It's possible the wideband is wrong. 7, cruise AFR 14 07-05-2007 #9. 7 at idle and cruise. n150w bassani catbk. 5 or so. 3L needs 7-8 lb/hr in the idle area. 5 at I have experimented with a lot of idle tuning on my 224/230° cam'd LS1, and have found combinations that smelled pig rich and ones that smell clean. 2) Idle to 1600rpms the engine is running pig rich, but as I take fuel away it becomes more and more difficult to 383 Callies Crank and billet 4 bolts mains, Howards Billet Rods, Comp Cams, MSD Ing & Opti Spark, BBK, SLP H\headers, JE Pistons, AFR/TPIS ported Heads, selling ProCharger 600b to help fund TT58's , 3000 Stall 5 disc lock up, 3. 0-12. 7 LS1 GMC Custom KBracing front mounted, BW S480, intercooled turbo . Like Baaa stated earlier as well the second issue is the idle. I also notice that the AFR drops down to low 12's as well. Noticed though everytime I change gear on the selector the idle drops down a few hundred then climbs back up. At idle and cruise a given engine tends to operate considerably cooler than at greater loads, but the intake air and I recently installed an LS1 TB and LS6 MAF on my L67. 2 and 12. I had a local tuner tune it for me about 4-5 months ago and he said he tuned it 1) Clutch in rolling to a stop, the idle drops to almost nothing. LT1/LS1/EFI Tech. i have seen the afr heads gain 40hp on a stock ls1. This time, you have your airflow minimum relative to gear and engine coolant temperature. Leans way out at idle, way rich on throttle, VE table looks rediculous I was facing similar issues where one minute a cell would read one AFR and if I were to revisit the cell later it might read a totally different AFR. AFR at idle is 11. Running closed loop will make fueling at idle very difficult to get right. Thanks . No help. 5", free-air calibrated NGK AFX after the y-pipe, transform function based on logging raw voltages during it's startup routine, OTR intake with a MAF/IAT setup, saxonpc honeycomb, Ford red top 30# injectors, Supra TT fuel pump, Corvette regulator/filter (58PSI 29* here. Had a very slight stumble at idle. The wideband is installed after the cat however. 9-15. Big cams idle AFR 13-14, WOT AFR 12. 77 kHz and . you idle stumbling tho is probably your Base Air Flow (or Running Air Flow). CAI, TTS LTs, AFR 205s, 220 224 581 581 114, Z6 Int. 598 112* lsa disabled LTFT's, 0-ed out the idle overspeed and underspeed tables, bumped up BRAF by 2 g/sec, bumped up timing to 23*. the car idles at 900rpm at around 51-52kpa pretty good, so i wanted to lower that a tad to get a little bit more Well if you are doing a SD tune you got some work ahead of you. 5. I also did notice the idle AFR appear more rich, so i figure it must have had some impact. You need to be asking for 12. 2 afr. There was a guy with a LS1 Camaro with a transplanted LS6 crate motor at the tuner the Stock bottom end ls1 on e85-force fed air via a tc7875. At WOT the stock I'm helping a friend get his 91 z28 running with a ls1 ECU, 1bar SD OS. 34 lb/min where as the other reads lower at 2. Jump to Latest 7. 5) because apparently with a large cam with overlap, what the WBO2 sensor is seeing Lumpy idles will burn fuel inefficiently. , put in gear the idle drops then climbs back upafr goes to 16(max on sensor). Then when it is warmed up, it still very often wants to stall when I come to stop (auto tranny). The AFR is what the PCM is telling the engine to be at (not at all what the engine is) you will see that number change when you adjust the fuel tables with Edit. of twist with an A4 trans. When shifting into neutral and stopping, the idle will drop to 400 and swing back up to the commanded 850 and then drop back down before it finally settles. When I force the AFR to 16:1, it idles perfectly. Set Abuse Mode Enable = False C. g. Stoich according to your narrow-band O2's is not going to be what the engine wants at idle. Not connected to each other. 1 afr. Oxygen (O2) Sensor - Is an electronic device that measures the proportion of oxygen (O2) in the exhaust gas. 6:1 AFR that is going to give you the best/strongest idle with a cam like this. 1 at idle, Around town inc plenty of small trips and stop start 16l/100- 30l/100 highway 9-9. 5, any higher and you start getting knock on third gear and sometimes on 2nd gear too, and dont go higher than 22-23 on timing either or you will get knock at any A/F, but if you I have a 94 camaro I swaped an LS1 into. Working on getting low speed/idle dialed in, it's working about as good as it could get with a monster cam, 253/261, . 050--3800 Edge Stall--TH400 w/RMVB trans brake--3. Jump to Latest 1. 5 below peak From what ive been reading, everyone suggests an idle AFR target of 14. All this a competent tuner should have done for you before you parted with your hard earned cash. It is the ratio between the mass of air and the mass of fuel in the air-fuel mix at any given moment. 0 and the STIT would have to make a quick learn to the previous value of 3. 72 Rockers 7. 613 . Hi, Ive been adjusting my VE tables and have the LTFT pretty close to the 0 to -6 range. I have mine set to 13. i used HPT real time tuning to adjust it until the idle in the hystogram quit hunting so much. They can bump cold idle speed only to help combat this. Smooth the idle up and make sure its not running too lean or rich at idle by logging the STFTs. So, my AFR is set to be 12. I have my idle timing readlly low (about 4 degrees BTDC) and the regular adv table it around 10-12 for the first two rpm rows. Right now I have it set to run open loop all the time and it runs good Set the AFR first and get it to idle close using the preset fuel base map and learning features if needed. LSx, LS1, LS2 LS7 GM Performance & Technical Information 04 GTO LS1, ported 243 heads, 227/230 . I took pictures of what my scan tool said and see if it means anything to anyone. The only problem I saw yesterday on a dyno was at idle it was reading 18, then once the rpm's went up above the 800 idle the A/F ratio started going down to the 14. i want to replace my heads and cam, and i know i will need a tune after that. 550 BTR Pushrods BTR Stage II NA Cam 227/234 . 7 afr until warm. Ben Charles. 0 and 0. 0. Both times the wide band O2 was showing ~ 14. it took a lot of fooling with that trying different things to get it so it was stable especially coming to a stop. My LTFT's at idle go from matching at 14. 3K views 3 Just installed AEM wideband AFR and at idle I am seeing 14. 73s, GMMG, ASP, 160 stat, Rapid tune, STB, LCAs, Brkts, SFCs, SLP 1LE control" affect or hanging idle in either-you went too far and start subtr. Hello everyone, I'm looking for some advice on how to resolve the idle hunting that I'm experiencing on my cammed M6 ls1 C5 vette. SOLD '09 AWD 3SS - IEATSRT8 intake, PCM4LESS tune, LS1 EFANS, 160 stat, vette servo, Pypes Violator muffler w/ res delete. 0, intake, heads) (LS1-PCM, O2s, injectors) I have been using the LS1 tables since I am using LS1 electronics but the electronics are calibrated for LS1 cubic inch, heads, intake, manifolds etc. AFR in open loop--for cold start up--From 68* on--what worked best for me was to start the AFR's at about 13. 1 varying on Welcome to the LS1. I'm not sure what has been changed on the car since its purchase since I recently purchased the car. 7, and WOT 12. You want 15 to 1 at idle you could do 14. 5 95*F AFR was 13. 90 Trickflow heads Comp Ultra-gold Arc 1. 7 but idling does not build enough heat to damage anything and will be running hot long story short. 17 kHz and 1. No epoxy in the IAC entrance So I am starting to make some progress I think. Open the VCM Editor>Edit>Transmission>Torque Management B. 44 and the maximum memory value was 2. Fitech EFI mysteries, high AFR. I have seen tunes cheat and make it look better then it is tweaking Set the idle advance and set it to be active under 1500-1600 rpm and under . Cleaned tb and maf. VJCX stall and NGK TR6's sitting on the shelf. Ft. This will help with the idle stability until you finish the tuning process. my question is this; the only place i know to get it tuned at is about an hour and a half away. p. It also happens when backing out of a parking space or driveway. it still likes to surge when trying to correct the AF. During the first few minutes after starting the car the idle varies widely from 400 - 1000 rpms. Bought a new coil pack and swapped and checked them one by one. This excludes older inefficient larger engines that are very inefficient and usually want around 12. March 20th, 2008 #5. I try to adjust the idle. Keep in mind this isn't actual VE, but calculated VE, based on the fuel flow table that is under the VE% Table. I am using a 2000 Camaro A4 harness and computer. So I Most engines can tolerate 1. I havent driven her yet, because Im worried about the lean mixture. I'm thinking injector or 02 sensor. 6 was the best it would get on highway. I did make a WOT pull in third gear, car is fine. After a WOT blast and coming back down to idle, ~980+rpm, the oil pressure hangs between 17. From some information i found it suggests for medium cams , try within the range of 18-22 degrees of advance for a steady idle. LS1 running 220 3. 44). 73's--Next up 150 Shot and 9"(after I twist the 10 bolt in half):lol: A forum community dedicated to PCM Tuning Process Flow . View Profile View Forum Posts Lifetime Member Join Date i apologize if this has been went ove before. So there's no simple answer to your question. I tried searching, couldn't find what I'm looking for, does this sound right? LS1/LS2 Engine Tech. You don't just pick some AFR, the PCM PICKS IT (based on O2 switch voltage) and tries to maintain it. 08" wall. It doesn't have cats or any of the emissions stuff on it. The o2's see the extra air in the exhaust We just did afr 225 heads ms4 cam and fast 102/102 setup with 100 maf and tuned by frost and it is surging between 1200 and 1400 at idle I can't find any vacuum leaks and we have torqued the manifold 3 times now. If I change the stoich AFR will I be in for a major change to the MAF or VE tables? I was thinking that since I tuned based on lambda that there should be minimal to no change to these tables with a change in the stoich AFR. 00 lambda but my car idles much better at a leaner AFR, typically around 16. 595/. 2% to the right bank at 16% then back to 14%. No way a little 5. started with wires, nope, plugs, made the stumble much worse! Ngk iridium gaped to . 7 while in closed loop, using my ve table to make this changes, instead my ltft's wil encrease or decrease depending which way i go with the ve. is it safe to drive it that far after the r&r? any tips on that or the replacement would be appreciated. What is your BLM at idle? and what does the stock O2 If you are tuning a factory LS engine using the technique of reflashing, idle speed tuning may not be something you give too much consideration tobut it probably should be. I had also added 3/8" diameter rods w/ . catless with ls7clutch Just rebuilt a LS1 with a Comp Torquer v2, 232/234 . with the w/b connected no matter what changes i make to the ve afr's remain at aournd 14. I was holding the throttle steady at 2000rpms and wideband It was enriching the mixture for cold start/warm up and the AFR (FWIW) were in the 10 range. LS1408. redhardsupra has a blog with a sreadsheet on there that will help you find the right numbers -LS1 stock short block-AFR Enforcer heads, 1501 (flow somewhat better than 243 heads)-JBA shorty headers and high flowing cats-FAST 102 intake and NW 92mm TB But the power & idle quality were very impressive 431 HP & 427 Lbs. I'm incredibly new to tuning so please bear with me I may sound like an idiot but with a 2001-2002 P01 (LS1 CAR) PCM I should only have one VE table and for some reason no matter what changes I make it doesn't Hello All, I'm looking for some advice on how to solve my idle hunting issues in my cammed LS1 C5 vette. White smoke = somethings buggered up. 50 and scale up to about 13. 5 I can smell the fuel, waiting on my pro link cable to come in so I can actually read the AFR in the scanner. View Profile View Forum Posts Private Message Tuning Addict And for sure with a commanded AFR all the way down into the 11's. As weather got colder (below 40F) and very humid, I started to have terrible idle on my 383ci LS1. I ended up leaving all idle settings stock (stock cam). Just remember that he asking about a trailblazer SS that its quite heavy and that truck has an LS2 and in my experience those trucks in stock form or with with mild mods like an A/F of 12. Save Share Weird thing is I played around with the idle afr with closed loop and stft's disabled completely. That didnt affect AFR whatsoever. 5:1 and is out of my widebands range. List of mods: ID1000cc injectors DW65C Fuel Pump Cobb FPR fix Cobb Intake Cobb Catted DP Invidia Q300 Perrin EL Headers Perrin Turbo Blanket Shouldn't a good AFR Correction 1 reading be the same regardless of mods though? i have a w/b fuel meter and efi live, it seems i can't bring down my afr from 14. Make sure the MAF and VE table for fueling is good too, Idle speed remains consistant at 550 rpm in "D", which is in spec. Idle AFR in open loop varies with coolant temperature. 1K views at 20. 40. 5% over what your TPS is when closed ( if your tps read 2. 5%, set to 3%). and a slipping trans. 7:1 when not in power enrinch mode or The ECM looks at the O2 sensor and adjust the BLM to make the idle AFR correct. 8, the car has a TVS 2300, LTs catless, stock heads, full tune is this in range? When I am able to get the car out, spring has not arrived in MN what ranges should I see while on the road? Logged while hot and at a steady cruise oil pressure is at 31-33psi @ 2200+rpm. 5 at idle and 14. I have played with the throttle set screw; bumped it up a little and then did the TPS re-learn procedure, but if For the most part, you don't pick stoich or part throttle for the car, or idle, etc. If it’s spiking to 20-30 it’s running lean. The LS1 has stock 241 heads, rebuilt stock bottom end, AFR Comp cam 224/228 . 82 lb/min. Afr is 10 at wot. The car will always fight to achieve 14. Why would VE tables only work under those conditions? So do I start with truck closed loop O2 tables or LS1 tables. I did fire it up and it idled great at 1200 rpm and a perfect 14. 5, 1000 RPM, but it doesn't seem to like it. That seems way lean to me, I have not sprayed yet because I want to make sure all is well first. 5% at a time back B3605-Comm. So still back in square one still. 7 at idle, also at idle it has that poping sound which I thought it meant it was Open Loop Idle Fueling The VCM Editor>Edit>Engine>Idle>Base Running Airflow>Idle Airflow vs. Eventually it comes back up to half of what commanded idle is (900-950) and it never comes back fully. 5 and not mid 11's. However, it hesitates at WOT and runs around 16 + afr. 7:1. if the STIT was 3. As a part of tuning for a car like yours, lockup in third is disabled, and sometimes the lock/unlock settings are tweaked to keep it Welcome to the LS1. 38@135mph, 1. I went driving around with my predator and monitored AFR which is 14. if you can trust dash 233/233 . It did not happen all of the time, but even it happened only once during a drive was too much in my opinion. reason i ask is because i still want a sleeper look and when at idle i want it to be nice and smooth with the stock cam. It currently runs fine for cruising and holds around 14. After cold start, it won't idle without throttle. Now i can't get the idle back up to 10. I can't find much good info on what AFR is healthy across the board. 600 lift 4-4. You want it a little richer around peak torque and leaned out a little around peak h. I have noticed however that when it's not surging in park changing VE table data does indeed change AFR. Welcome to the LS1. DISABLE ALL TORQUE MANAGEMENT – This will eliminate all torque management within the PCM. 7 or 1. Its literally Depending on the camshaft it may want 18-20 degrees or even 22-24ish degrees for a base idle timing to be happy. 0 AFR. 0 after revving up to about 1200 it kicks it down to about 14. 2l/100 on cruise. Didnt register a single degree of knock retard, and AFR's are right at 12. Its all in the tune. View Profile View Forum Posts Private Message Tuner in Training Join Date Jun 2014 On average at idle one reads 3. By nothing I mean 200-250rpms and the engine shakes like crazy. 85 up to around 200*--accross to 18 MAP B4317 throttle follower in gear---adding % gets rid of hainging No exhaust leaks and my Air fuel ratio at idle is at 16. 1-12. That said, something in your Fuel Injector Information is not right or not flowing as it should be. 8 WOT on FI engines depending on boost. I have my open loop pretty much dialed in and want to switch back to closed loop. Only time afr is normal is at idle. 23 gears I've messed with O2 settings and switchpoints, the best I got in CL was 15. I'd like however to run open loop with STFTs except in the 400-1,200 RPM range where I want it to be open loop without trims. 01 ECSB 1/2 ton 4x4 Forged 5. WHYTRYZ06. 581/. While looking in the engine bay with the car in idle you can see the engine pretty steady but i have a 94 lt1 with AFR 180cc heads, ported intake and cc305, shorty headers i have leaned out PE mode to 13:1 and added 3 degrees across the tables for timing and idle at 30 degrees when i reprogram my pcm it takes a while for the idle to return to 800 rpm i noticed the iac position is too low and mass air flow dives to 5 or so grams per Welcome to the LS1. 25 lambda or 18:1 gas AFR before misfiring at idle. You are currently viewing our boards as a guest which gives you limited access to view most discussions and access to our other features. It is coded into the 02 switch points. Since you have white smoke at idle and black smoke on wots there has to be two separate issues. 75:1 at anything below WOT and anywhere from 15. 72psi. 5-11. At idle there is fairly low cylinder pressure during the ignition event, running closer to TDC means there is more cylinder pressure and compression heat, so ignition is a lot easier. LS1GTO. (Truck-6. 230/242/113 cam. I'm fairly familiar with ls1 tuning, but the LS2 seems a little different than the ls1. 12-19-2017 #5. Adaptive idle control is used to control the idle speed using the ignition timing. At that point the engine seemed to idle but I think it would still stall if left to run past say 15-20 seconds Air-Fuel Ratio (AFR) - The most common reference term used for mixtures in internal combustion engines. Then finally set the cold cells to one, across the board. No codes. 10. 6-14. I run 16. Once it is stable then you can Save Tune As and you have a known starting point to work from. 5 even though commanded is 14. 0/1. Hopefully Sunday i will be able to log it and tune it. & clutch, 3. Last edited by ericbedd; 12-19-2017 at 10:32 AM. When the closed loop timer times out, the ECM goes into closed loop. You aren't "returning to your stock a/f ratio" or making any change to that, or running anything other 14. It made 520rwhp a couple weeks ago but he's been complaining about the pinging (it doesn't ping with Torco in it) (and I know New to hp tuning and I?m working on getting the idle dialed in, ls1 ms3 cam headers, nothing specail, 4k stall 07-04-2021 #8. Runs great if I reset the fuel trims every 20 one thing I found that is odd is in idle is 15. It is an 02 camaro with headers and a 231 237 / 592 602 at 112. digger Guru Posts: 2795 Joined: Sun Jan 27, 2008 11:39 am Location: Re: high kPa map reading at idle but also to temperature. 4-12. I had it hooked to a wide band and for what ever reason, that is where it idled the best at 900 rpm. 6 and running is 14. I'm using an LS1 MAP, MAF, O2 sensors, 0411 PCM with lingenfelter box 1994 Trans Am: LS3 Crate Swap - Cam Motion 216/ What should my idle AFR be? Mostly stock LS1, seems to be idling about 10 to 1 which seems rich I can't find much good info on what AFR is healthy across the board. AFR/Oil psi at idle. Any suggestions are welcome thak you ahead of time Welcome to the LS1. Once it warmed up and the idle kicked down it started to surge slowly up and down and then surged so low it died. And the car has 123,000 mile so i figured a new top end may help freshing things up a bit, and from the article i read the heads only can give you a little mpg cruising. After some 20 minutes of city driving everything is normal again, drives and idles fine. 6-15. 18* timing 11. 2:1 scr--58mm TB--LT w/X TDs--23X/24X @ . ECT table is like a software choke that is used to control the mixture at idle when the engine is in open loop. 13. Im going to do a fresh, free air calibration on the car tomorrow and see if that changes anything. Currently, I am running in open loop because I was going to try a little leaded C16 fuel for some high boost stock internal applications. I decided to figure out the issue. 2000 Camaro Z28, LS1 M6, Custom Tq Cam, FAST 102/NW102, 42# LS1 injectors, 243 heads. 8 n/a at WOT and 11. I'll check the plugs and pull wideband sensor later in the week when I have time. Edit: When I disable idle proportional it will stay near stioch, but smells much worse (no cats). When I first got it running it would idle fairly smooth then start surging as it warmed up. It controls AFR by opening or closing the throttle blade slightly to meet the values in the cells at a given coolant temperature. 0, cruising around 14. Well I got the coupler and hooked up the intake but no time to get the laptop out and log it. . After startup the AFR plumits to the 18-19:1 range. Also, do fuel trims impact idle AFR? I did the tune with a wideband based on a lambda of 1. It idles and runs okay. Problem: The cars idle is a bit rough/shaky at idle, but the RPMs are always steady at I would say a 800 range or so. Sometimes its even so lean that it goes leaner than 19. 0 AFR or richer depending on your cam. 7. That way it enters closed loop very quickly. I'm concerned with some backfiring through the exhaust. 67 60'ft. Since we need a certain amount of engine torque to maintain a steady cruise speed on the road you reach a point where a leaner AFR reduces torque so far that you need to open the throttle further to maintain speed and hence you end up using more fuel anyway - LS1/LS2 Engine Tech Idle Surge Issue Fixed After the completion of Project Punisher Goat, I was having some issues with idle surging. For example, below is the equivalent graph from a Gen 3 LS1. cthulu. Usually white smoke on start up,idle and under deceleration has to do with the valves,white smoke on wot runs has to do with rings. After about a minute, it comes back and runs at about 14. Afr is at 10 when steady throttle cruising, doesn't matter the rpm. A wideband is more helpful, but here still it's not 14. Lean afr's, well that's going to be an argument between tuners as everyone has their own opinion. 5:1 gas AFR at idle and usually misfire over 14:1 gas afr. Not sure why, but it was like magic. com forums. Well, I made some adjustments. 608 Comp cam, longtube headers into a single 3. does it every time. 3-12. jkrvznq owvugk edjk vqspa mjui uspx guamv ynpsc ciu nudhv