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Old 08-06-2010, 05:49 AM   #1
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A/F problems.

ok so for the past few weeks now i have been seeing crazy A/F numbers it is jumping around like a nerrowband. and driving me up the wall.. every so often i get a cel i check it and it says SYS to lean and a seciond one that says O2 Left bank slow responce or something like that.. i have no idea on whats going on. all i know is normally my car runs at 14.5 to 15.3 when crusing and when i get on it it drops to 11.3 and stays fairly stedy. when i kinda goose the gas it jumps up past 18 and then drops down to 13 or 12.2 and kinda stays their .i have been thinking my tune is the cause of the problem. and that the guy could have tuned it to wenter gas and now it's throwing everything off. or is it the 110* weather we have been getting. i have noticed the car is slugish right now. but i figured that was caused by me taking the UDP off so i could by pass my broken AC compressor. just need some advise on what to do.. and don't just say get toms tune. im planning on it but im poor and have rent to pay till my girl starts her new job. thanks.


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Old 08-06-2010, 09:39 AM   #2
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my AF acts crazy when I got AC on or lights. Did you try to drive without AC on ?? and how did you hook up your AF wideband ?
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Old 08-06-2010, 09:49 AM   #3
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my AF acts crazy when I got AC on or lights. Did you try to drive without AC on ?? and how did you hook up your AF wideband ?
it's the AEM wideband so it's a kit i just installed it in the second O2 hole. since im not running a cat. and i don't/can't drive with the ac on. i don't have AC right now. hence why i said i have to remove my UDP to bypass the AC compressor.
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Old 08-07-2010, 01:58 AM   #4
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bump...
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Old 08-07-2010, 05:14 PM   #5
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I would contact your tuner , Octane has little effect on the AF

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Old 08-09-2010, 04:46 AM   #6
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well im sure that wont happen he is a huge flake so thats why im trying to get the money to get a tune from you.
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Old 08-09-2010, 12:49 PM   #7
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if your o2 is showing a slow response code change it. the ecu tries to compensate for the slow reading and when it does it gets another reading from the slow o2 causing the bounce you see in your wideband. this is also where your suddenly leaning out under hard acceleration then settling to where it should be.
Try replacing the upstream o2 before blaming the tune totally.
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Old 08-09-2010, 03:06 PM   #8
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well the o2 thats on their doesn't even have probably 20K on it... i go through O2's on this car so much.
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Old 08-09-2010, 03:56 PM   #9
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lol, join the crowd. It's sad when the parts store stocks them now...
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