PlEASE HELP. Hesitation after Header Install and Tune??
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Teching In
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PlEASE HELP. Hesitation after Header Install and Tune?? I have a 2001 A4 Camaro SS with American Racing Headers just installed with a set of Richmond 373 gears, a K and N cold air unit and a 160 degree thermostat. I gained some nice HP to the rear wheels. I went from a baseline (stock) 305 hp to 340 hp on the dyno. Great numbers in my opinion for the $. Anyhow, I am noticing some hesitation in acceleration when I mash the pedal to the floor while cruising at speeds between 35 and 60 mph. There seems to be a half second delay from the time I floor-it until the car puts me back into the seat. The car drives fine other than this issue. I called the guy who installed and tuned the car. He is saying it is because I need a bigger stall converter. Well, shouldn't my stock stall be locked up when driving at these speeds and it shouldn't matter? Is this a bad tune? Is this normal for an A4? Why would he say I need a bigger stall? I am not having any idling issues, my car responds great from a standstill, and there are no lights on my dash going-off. I hope to recieve some feedback from anyone this might have happened to. Thanks.
Last edited by mawilso24; Jul 17, 2011 at 09:20 PM.
sounds like its transmission related IMO. Does it seem like it hesitates while downshifting? I know the 4l60 in my truck sometimes takes a second to downshift into 1st at certain speeds when i punch it. Almost like its unsure if it really wants to downshift or not lol.
Thread Starter
Teching In
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Not quite sure if hesitation or a dead spot. Not really sure what a dead spot is. But all I know is, I didn't notice it before the install of the headers and other equipment and tune.
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Thread Starter
Teching In
Joined: Jun 2010
Posts: 25
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Thread Starter
Teching In
Joined: Jun 2010
Posts: 25
Likes: 0
Thread Starter
Teching In
Joined: Jun 2010
Posts: 25
Likes: 0
When you say stumbling, are you referring to what I explained during 30 - 50 mph driving?
Descreening an MAF can introduce air stream turbulence, which in turn can cause throttle response issues.
If you oiled that K&N filter when you installed the K&N CAI you may have oil fouled the sensing wires in the MAF. (If you did not oil it, of course it is not the issue.) If so, you can clean with some CRC MAF cleaner which is supposed to be safe. (Cleaning the MAF sensing wires with the worng chemical can ruin them).
The problem could be a number of things including the tune.
(I just do not believe that adding headers to an otherwise stock motor necessitates a higher stall.)
If you oiled that K&N filter when you installed the K&N CAI you may have oil fouled the sensing wires in the MAF. (If you did not oil it, of course it is not the issue.) If so, you can clean with some CRC MAF cleaner which is supposed to be safe. (Cleaning the MAF sensing wires with the worng chemical can ruin them).
The problem could be a number of things including the tune.
(I just do not believe that adding headers to an otherwise stock motor necessitates a higher stall.)
Thread Starter
Teching In
Joined: Jun 2010
Posts: 25
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Descreening an MAF can introduce air stream turbulence, which in turn can cause throttle response issues.
If you oiled that K&N filter when you installed the K&N CAI you may have oil fouled the sensing wires in the MAF. (If you did not oil it, of course it is not the issue.) If so, you can clean with some CRC MAF cleaner which is supposed to be safe. (Cleaning the MAF sensing wires with the worng chemical can ruin them).
The problem could be a number of things including the tune.
(I just do not believe that adding headers to an otherwise stock motor necessitates a higher stall.)
If you oiled that K&N filter when you installed the K&N CAI you may have oil fouled the sensing wires in the MAF. (If you did not oil it, of course it is not the issue.) If so, you can clean with some CRC MAF cleaner which is supposed to be safe. (Cleaning the MAF sensing wires with the worng chemical can ruin them).
The problem could be a number of things including the tune.
(I just do not believe that adding headers to an otherwise stock motor necessitates a higher stall.)
