So my 99 tahoe has an engine with maybe 40k miles on it. I remember this being an issue last year. It's warming up here in central VA and the hoe is reacting. It likes to putter along at low RPM's. Unless I get on it, it really is choppy and acts like its being suffocated. It has a CAI and high flow MAF. Any help!
Stutter when hot
- Thread starter RAWVORTEC
- Start date
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SunlitComet
OBS Jedi-Do Good
the regular oem maf is more then good enough. the high flows may sometime alter the data output based on design. put the original back in and run a test of you fuel pressures. also ensure no leak thru in the induction system piping.
SunlitComet
OBS Jedi-Do Good
Get some live data that tells you things like the airflow and sorts then get a fuel pressure tester on it as well at the same time. I don't doubt and after market maf could fail after 2 years at all. bad fuel pressure would starve you when on it a bad maf, map could make thing difficult when just idling or under light power but gets worse with more power as well. Iac is something else to test. Is the filter clogged at all?Do you get not codes at all about any like bad sensor data or misfiring because of possible loos or corroded terminals in the ignition system.
SunlitComet
OBS Jedi-Do Good
If no damage to connector parts on maf wiring on maf side to pcm sie then get a delphi maf back in here. Is your original around. How about cleaning the either of them and trying again after codes are clear.
P0101 the maf is not outputting the predicted frequencies based on data from other sensors.
This is why you does you high flows. The oem can handle more then you think a high flow does.
p0442 Start with making sure gas cap i on correctly and secure. Look under the hood for broken or leaking vapor lines. The pcm put a vacuum in the evap system but it did not hold it for the few seconds that was expected.
Start with that and we will go from there.
Curious tho, you had a the warning light up first correct? or was it burned out when you pulled the codes?
P0101 the maf is not outputting the predicted frequencies based on data from other sensors.
This is why you does you high flows. The oem can handle more then you think a high flow does.
p0442 Start with making sure gas cap i on correctly and secure. Look under the hood for broken or leaking vapor lines. The pcm put a vacuum in the evap system but it did not hold it for the few seconds that was expected.
Start with that and we will go from there.
Curious tho, you had a the warning light up first correct? or was it burned out when you pulled the codes?
No Check Engine light ever came on. And how do I check vapor lines? Where do they run?
"The pcm put a vacuum in the evap system but it did not hold it for the few seconds that was expected."
What did you mean by this^?
Ill prob have to wait around a month to pay for that $100 OEM MAF.
"The pcm put a vacuum in the evap system but it did not hold it for the few seconds that was expected."
What did you mean by this^?
Ill prob have to wait around a month to pay for that $100 OEM MAF.
SunlitComet
OBS Jedi-Do Good
you are looking at all the plastic or rubber vapor lines that run all over the engine bay for tears, cracks, and breaks etc. There light be a simple chart on your cooling fan shroud that point them out.
The system used the vacuum from the intake to create a vacuum in the evap line system. It then isolated the system and a sensor in the system noticed it did not maintain the vacuum level it was suppose to before working normally again.
The system used the vacuum from the intake to create a vacuum in the evap line system. It then isolated the system and a sensor in the system noticed it did not maintain the vacuum level it was suppose to before working normally again.
SunlitComet
OBS Jedi-Do Good
If it effecting the mixture ratio enough then yes.
