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12-31-2010
So I have a 1999 grand prix GT and It has a few problems. I get real crummy gas mileage and it lopes all the time. When it's cold it runs fine but as it heats up it lopes after touching the gas a few times before it fines it's idle. I've thought vacuum leaks, MAF, or fuel pressure regulator,but I don't know. Anyone have some advice?
12-31-2010
Unplug the MAF...if that changes anything then you need a new one.
Vacuum leak...spray carb cleaner around the motor when its running...if the idle changes then you've found your vacuum leak.
12-31-2010
Edit, Blue mirrored what i was typing.
http://www.streetfire.net/video/2001...ynp_208097.htm
12-31-2010
Iz psychic.
12-31-2010
Wait unplug the MAF while the cars running or off?
12-31-2010
While its running.
12-31-2010
So I unplugged the MAF sensor while it's running and nothing happened..
12-31-2010
Ok...so then the MAF is good...check for a vacuum leak with some carb cleaner while its running...do you have any check engine lights?
12-31-2010
I will go get some a look around with that
And yes I do I scanned it and It came back as mass volume air low(or something like that cant remember fOr sure) and running lean in bank 1
12-31-2010
Alright I'll look around with carb cleaner and see what I find
12-31-2010
Anything most of the time bank one lean is 99.999999999999999% a vacuum leak...most of the time your factory lines and rubber "T" fittings around shot around the fuel rail, throttle body, lower intake manifold, upper intake...etc.
01-03-2011
Update*
I sprayed with carb cleaner and found a leak. I replaced the vacuum fittings and t fittings. Turned the car on and it continued to lope>I then scanned the car again and had two different codes. I musta fixed the leak but now the codes both say MAF is bad... So new MAF?
01-03-2011
yes
01-05-2011
Replaced the MAF and its perfect thamks for the help guys
01-05-2011
Funny thing here is I think we got lucky.
When you unplugged the maf, you were destined to have a maf code.
01-05-2011
Dang if thats true I might have LOL
Luckily everythings fine now runs like 5X better now
01-08-2011
i kinda have the same problem.......
when i turn the car off, you hear woosh sound..?? is that a vac leak???
01-08-2011
intake?
01-13-2011
my intake does the same thing its not a problem
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