problem when car warms up
03-28-04, 05:49 PM
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problem when car warms up
1991 T2, Ok the problem i am having is once the car warms up it wont rev and keeps sputtering, the thing is it starts up right away and idles perfectly rev's fine but once the car is heated up and you try to drive it it just looses all power stuppters and backfires alot, i have swapped MAF, computer, just to check if that was the problem but it didn't help the car has all new plugs and wires and everything seems to be working fine i am thinking about swaping the TPS next but really i am just guessing any help would be great
04-01-04, 01:09 PM
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Hmm. Have you tried testing and setting the TPS? Once the car is warm is moves the position of the throttle a little bit which affects the TPS setting so make sure it is warm when you set it. When it is running like garbage try unplugging the TPS and see if anything happens.
04-01-04, 01:15 PM
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Hesitation - random fuel cuts?
Copied from my little FAQ file:
One possible cause- You could have a worn out TPS resistor.
-The definitive test:
Pull the TPS connector off.
Get an analog (needle type) VOM set to the 1K scale.
Connect it to the pins for the orange & green wires.
Open the throttle enough so you can test the TPS plunger through its full stroke.
As you work the TPS plunger in & out, the meter needle must swing smoothly from ~0 to ~5K ohms.
As the TPS wears, it can give non-linear or inconsistent signals to the ECU.
A worn out TPS may give 1K ohms at idle, but have a drop out or short further up the scale.
A drop out at mid scale will tell the ECU to idle at that point & give a fuel cut hesitation.
I had one go open at the top which made the S5 ECU go nuts, giving random fuel cuts.
One possible cause- You could have a worn out TPS resistor.
-The definitive test:
Pull the TPS connector off.
Get an analog (needle type) VOM set to the 1K scale.
Connect it to the pins for the orange & green wires.
Open the throttle enough so you can test the TPS plunger through its full stroke.
As you work the TPS plunger in & out, the meter needle must swing smoothly from ~0 to ~5K ohms.
As the TPS wears, it can give non-linear or inconsistent signals to the ECU.
A worn out TPS may give 1K ohms at idle, but have a drop out or short further up the scale.
A drop out at mid scale will tell the ECU to idle at that point & give a fuel cut hesitation.
I had one go open at the top which made the S5 ECU go nuts, giving random fuel cuts.
Last edited by SureShot; 04-01-04 at 01:17 PM.
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