Car is lean at idle and it will not richen up!
Thread Starter
Launching!
Joined: Jan 2003
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From: IRVINE,CA
Car is lean at idle and it will not richen up! My car runs lean at idle LTFT's 14-18; however, I cannot get the LTFT's to come down at idle. Tried changing VE table, etc. but no change, or if they do change, they eventually go right back to lean condition. I have an ATI P series supercharger. Is the charger keeping me from riching up the car at idle? Or do I have a air leak somewhere?
Thanks
Thanks
Thread Starter
Launching!
Joined: Jan 2003
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From: IRVINE,CA
Originally Posted by wait4me
yah, could be a vac leak, or possibly a miss adjusted maf table. 
try changing the maf where you idle, that should bring it back. "if not a leak"
try changing the maf where you idle, that should bring it back. "if not a leak"Can I take my intake off and put some kind of sealant on it, and then put it back in just to be safe?
My manifold air pressure is at 40 KP(spelling) at idle. Does that sound ok. That means no boost, right?
Thanks for the input guys!
Originally Posted by IRVINEWS6
I had a Granatelli MAFS in the car, so tonight I changed it back to the stock one. Tomorrow I will do some logging to see if anything changed.
Can I take my intake off and put some kind of sealant on it, and then put it back in just to be safe?
My manifold air pressure is at 40 KP(spelling) at idle. Does that sound ok. That means no boost, right?
Thanks for the input guys!
Can I take my intake off and put some kind of sealant on it, and then put it back in just to be safe?
My manifold air pressure is at 40 KP(spelling) at idle. Does that sound ok. That means no boost, right?
Thanks for the input guys!
More than likely it was the Granatelli.The stock unscreened meter will idle better because the air doesn't swirl around the meter.
Thread Starter
Launching!
Joined: Jan 2003
Posts: 203
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From: IRVINE,CA
Originally Posted by Slowhawk
More than likely it was the Granatelli.The stock unscreened meter will idle better because the air doesn't swirl around the meter.
Should I take off the intake and put sealant on it and reinstall it? Or is there a way to check the vacuum lines? My Autometer gauge reads about 15 to 17 vac at idle.
TECH Addict
Joined: Feb 2004
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Always nobody listens to me. Your intake has drastically changed before your MAF. Your MAF table is wrong. And raising your VE table isn't really helping. You end up with rich VE fueling and lean MAF fueling, so at idle and low-rpm it is poopie. Try the Holden MAF table. The intake design is probably much closer to what you have. Then adjust your VE a little, if needed.
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Thread Starter
Launching!
Joined: Jan 2003
Posts: 203
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From: IRVINE,CA
Originally Posted by Another_User
Always nobody listens to me. Your intake has drastically changed before your MAF. Your MAF table is wrong. And raising your VE table isn't really helping. You end up with rich VE fueling and lean MAF fueling, so at idle and low-rpm it is poopie. Try the Holden MAF table. The intake design is probably much closer to what you have. Then adjust your VE a little, if needed.
Thanks!
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I had a similar experience... At idle, the car is calculating your air flow based on the ve table and maf table. To get the ltft right, disconnnect the MAF and log your trims at warm/hot idle. You will need to make changes to your backup VE table to get the trim in the -4 - 0 range. When the LTFT is right, copy this data to your main VE table. You will need to hand smooth the x5 cells (back up ve is lower resolution than the main ve).
At this point, plug your MAF back in and map your LTFT's against the maf raw frequency. You can adjust your MAF table as necessary to get your LTFT back in line.
At this point, plug your MAF back in and map your LTFT's against the maf raw frequency. You can adjust your MAF table as necessary to get your LTFT back in line.
Last edited by TAQuickness; Feb 12, 2005 at 03:02 PM.
i sayt its prolly the MAF-but wouldnt the Procharger have something to do with that because it probably flows better then your exhaust-wouldnt it richin up if there was more leaving through the exhaust-so MAYBE lol you could get a cam with more exhaust duration?
JMO
-Adam-
JMO
-Adam-
1. calibrate your MAF first(pm/aim/whatever me if you want a spreadsheet to do it)
2. only THEN it makes sense to adjust ve
3. running lean at idle is fine, you're not putting any load on it anyway, so it's not gonna detonate, but you don't eat up gas without a reason either. if it idles fine, leave it lean.
2. only THEN it makes sense to adjust ve
3. running lean at idle is fine, you're not putting any load on it anyway, so it's not gonna detonate, but you don't eat up gas without a reason either. if it idles fine, leave it lean.
TECH Apprentice
Joined: Jan 2003
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From: Mission Viejo CA
Thread Starter
Launching!
Joined: Jan 2003
Posts: 203
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From: IRVINE,CA
Originally Posted by Honez
Would someone please look at my files (test run 1 and test run 2) on the above site, and let me know what you think. I am lean at idle and rich elsewhere. This has caused me to fail smog.
Thanks
James
man, all the pinging... 18 degrees of knock... 
It looks like the calculated air is not correct. It isnt using the timing tables like it should. When you floor it and make boost it should be showing the cells being used lower on the timing tables, but you are in the middle no matter what????? So it is getting way more timing than it should. just a thought, jes
It looks like the calculated air is not correct. It isnt using the timing tables like it should. When you floor it and make boost it should be showing the cells being used lower on the timing tables, but you are in the middle no matter what????? So it is getting way more timing than it should. just a thought, jes TECH Apprentice
Joined: Jan 2003
Posts: 308
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From: Mission Viejo CA
Don't jump to conclusions about the pinging, when I was doing the log runs I struggled with the Spec-3 racing clutch and most of it was caused by me being in the wrong gear for the speed I was doing. It's not pinging as bad as the log files make it look. The focus here should be on the Fuel Trims.
