inconsistent hesitation
04-04-2008, 12:45 PM
#21
Originally Posted by S2Kart,Apr 4 2008, 12:20 PM
Mine was doing nearly exactly the same thing, never threw a code either. I checked the TPS voltage, plugs, oil, MAP, cleaned the IAC. Not heak soak either.
It would idle fine and hard acceleration or boost runs were fine, but from 2700-3000 rpms there would be an occasional hesitation. My AFR gauge would show a little lean when it happened. I checked air and fuel delivery next - all good.
Turned out to be the IAC, the reference voltage in or out of the IAC motor must have drifted out of range over time. I adjusted the motor position relative to the valve body (cut slots in the tamper-proof screws that hold the motor so I could use a screwdriver) and it works fine now, hesitiation gone.
It would idle fine and hard acceleration or boost runs were fine, but from 2700-3000 rpms there would be an occasional hesitation. My AFR gauge would show a little lean when it happened. I checked air and fuel delivery next - all good.
Turned out to be the IAC, the reference voltage in or out of the IAC motor must have drifted out of range over time. I adjusted the motor position relative to the valve body (cut slots in the tamper-proof screws that hold the motor so I could use a screwdriver) and it works fine now, hesitiation gone.
Its been a little wile since my car has done this, but I thought mine went rich. Like 10. afr. it would continue to stumble until I pushed in the clutch and cleaned it out. It only seems to do this when at a slow 5-10mph crawl in a line of traffic for a long wile, more in the heat I noticed. I can feel the car start to get poopy and then if I step on the gas to go it doesn't do anything and then all of the sudden it lurches hard and takes off sometimes. Or it will just sit there and spit until i rev it up and clean it out, but then its totaly fine again. Reminds me of what a old carborated engine could do. Weird
04-04-2008, 08:50 PM
#22
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do you have an aftermarket intake? even if u dont.. take your map sensor out and the port that the map sensor gets its reading from ..spray some carb/ throttle body in it
make sure it doesnt have anything clogging it keeping the map sensor from reading 100%
make sure it doesnt have anything clogging it keeping the map sensor from reading 100%
04-05-2008, 05:05 PM
#23
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Originally Posted by R3DS2K,Apr 4 2008, 08:50 PM
do you have an aftermarket intake? even if u dont.. take your map sensor out and the port that the map sensor gets its reading from ..spray some carb/ throttle body in it
make sure it doesnt have anything clogging it keeping the map sensor from reading 100%
make sure it doesnt have anything clogging it keeping the map sensor from reading 100%
~tina~
04-05-2008, 07:56 PM
#24
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Originally Posted by teanza,Apr 5 2008, 05:05 PM
did something to this degree ~a week ago. did the zip tie, as well.
~tina~
~tina~
04-06-2008, 10:23 PM
#26
I have had the zip tie fix for years as well, but doesn't matter. No codes. Stock box, just KN/gutted with ram air for direct cool air. Nothing jumps out at me to what the issue could be, or if there is a problem to fix.
04-07-2008, 01:21 PM
#27
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Originally Posted by frofro24,Apr 6 2008, 12:55 PM
~tina~
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