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Old 06-28-2010, 02:05 PM   #1
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ok.. so i need to know everything that effects af ratios

Just like it says.. im having a problem with my car running lean and the only diagnosis i can find or see is a/f are off. and when it runs lean it runs bad.. it doesn't run lean all the time just every now and then.. then goes back to normal then will go lean again.. then go back to normal... all in the same driving.. the only thing consistent about it is that it does this every time... and its only lean for a split second and then goes back to normal... i have tried everything i can think of to fix this... so i need to know everything that you can think of that could change that can effect a/f ratios.. heres my list so far.
vacuum leak
o2 sensor
maf sensor
spark plugs

any other ideas.. remember its got to be something that changes so a tune cant be it.. it doesnt change.. nothing on my car has changed setup wise or tune wise.. but i have changed those things with no luck.. need more ideas..


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Old 06-28-2010, 02:32 PM   #2
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is there any consistency to when it changes? like hard on the gas, braking, coasting, slow accel, or cruising? how old is your fuel filter?
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Old 06-28-2010, 02:42 PM   #3
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Sure it can be tune related , why would you rule that out , log your wideband to the xcal and see what happening and at what point its happening

Tom
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Old 06-28-2010, 05:38 PM   #4
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maybe you have a vacuum leak?
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Old 06-29-2010, 11:20 AM   #5
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how could it be tune related when the tune hasnt changed.. you have told me a million times tom that a tune doesnt change.. and filter is brand new i tried changing that. i have checked for vacuum leaks several times with no luck finding one.. and it does it all the time.. doesnt run as rich as it used to under wot (so i try to stay out of boost) cruising it will run between 13-15 then suddenly spike to 17 stumble for a split second and go back to 13-15 and it does this consistently every few seconds or so.. same with idle.. itll sit there when idling and run between 13-15 and then suddenly spike to 16-17 and stumble then right back to 13-15. i dont use my iac valve either so i know thats not it.. havent for years.. and also tom i still cannot get my car to data log.. not sure why i have called them and asked them and still no luck..
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Old 06-29-2010, 03:52 PM   #6
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When you say you cant find a vacuum leak are you also talking about a leak after the MAF? And when it goes lean does the car stumble all over itself or if you werent watching your a/f gauge would you notice that the car just went lean?
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Old 06-29-2010, 03:56 PM   #7
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its a slight stumble its not bad because it doesnt stay lean for long enough to but i notice it.. and yes all after maf and before maf.. i know a leak before the maf would do nothing but i looked anyways due to i cant fivgure it out.. i look at all vacuum lines intake, mani, tb, and anything else i can think of or see that is a vacuum line
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Old 06-29-2010, 05:11 PM   #8
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yep. mine done it to. always did. i just drove it like that, lol. good lucks with the fix.
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Old 06-29-2010, 05:49 PM   #9
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it has been getting gradually worse.. thats what worries me..
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Old 06-29-2010, 06:32 PM   #10
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Fuel system failing, not turning off adpative learning, dirty MAF or worn MAF wires, theres a long list of stuff it can be.

FWIW I'm still running the same old fuel system, still making over 365whp, that I've been running for years........ and it still works flawlessly
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