Idle woes, even after RTFM
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Senior Member
Joined: Dec 2004
Posts: 1,278
Total Cats: 37
From: Brisbane, Australia
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My idle a/f's were running a little rich this weekend. I think it has to do with the cooler temps and running the car in open loop. I never had any a/f problems at idle or cruise in closed loop fueling
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well over here it has been anything but cold and my a/fs are crazy rich, if i lean them out to where they read 14-15 on my tuning tab, once in a while whatever is adding fuel at idle turns off so it reads whatever is in the map and it dies because it has almost 0 fuel at that point.
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Anyone else get random fuel changes in the other section? Its been a while since I looked at it, but I remember an other change of like 300% that was counteracting another change of almost the same value.
Is it possible the air temp correction values are not what they need to be? I'm using what I've seen in every other map, but maybe we actually need something different than what is theoretically right?
Is it possible the air temp correction values are not what they need to be? I'm using what I've seen in every other map, but maybe we actually need something different than what is theoretically right?
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today my a/fs were 11 in the am, and on the way back home just an hr ago they were switching between 12 and 14 at idle.. i dont get it. Something else is when i am giving it some gas at idle and slowly increasing it increases slow, as soon as it hits 2k, it revs up quickly. Does not make any sense at all. Everything over 2k is perfectly fine.
Auto what temp sensor are you using? the GM one or the stock push in one?
Auto what temp sensor are you using? the GM one or the stock push in one?
Last edited by triple88a; Sep 7, 2010 at 04:10 PM.
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well after some more driving today i kept my eye on those fans, when the 1st fan turns on my a/fs go up 3-4 points so if its 10-11 it goes up to 13-15. When the 2nd fan turns on my a/fs get even leaner and the car dies at that point and wont start unless i 50% gas it and keep it above 2.5-3k rpm until the 2nd fan turns off as at that point (only) at idle i'm at 19-20 a/f. Makes no sense to me as its not reading whats on the tuning map.
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Open loop idle effort should taper down to 0 once the engine is warmed up. Also noticed you map prediction gain is set to 0 - should be 150-200 from what I've read.
If you haven't already check out Travis's idle tuning guide. Step by step makes it pretty easy to get it close.
If you haven't already check out Travis's idle tuning guide. Step by step makes it pretty easy to get it close.
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well i've kinda experimented a bit. both windows at the same time up/down, a/fs go lean and it dies...
it appears that its going the opposite way of how its suppose to be. lean vs rich...
as far as the open loop idle efford you're talking about the graphical representation in the idle tab right? The only way to lower these things that i know of is by turning all the base idle value all to 0s after let say 30 degrees? or is there another way i'm not familiar with?
i'll try 150 for the % gain in the map prediction.
it appears that its going the opposite way of how its suppose to be. lean vs rich...
as far as the open loop idle efford you're talking about the graphical representation in the idle tab right? The only way to lower these things that i know of is by turning all the base idle value all to 0s after let say 30 degrees? or is there another way i'm not familiar with?
i'll try 150 for the % gain in the map prediction.
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