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Discussion Starter · #1 ·
I have a sentra 95 with a 94 ga16de and i have idle problems.. I start the car and it idles correctly, but sometimes, if i just press and release the throttle, the idle increases and stay at about 1500-2000 rpm. sometimes it decrease to normal speed after 5 seconds, and other times it never drop down. when it stay a this rpm, i unplug the tps, wait and replug it and it drop down and the problem never recome for the time i drive it. but when i restart the car next time the problem reappear. the tps seem to be ok, and i adjust it to 0.45v close throttle and about 4v full throttle.
any ideas about the way to fix this trouble??
 

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huh... I know sometimes a bad coolant temp sensor can cause a high idle. I'd check that. also, check your vacuum lines for cracking. if you still haven't narrowed it down, try doing a self-diagnosis on the ECU. when I had my 88 max, it'd idle around 1500. I drove myself nuts checking this and replacing that. turns out it was a cracked vacuum line.

good luck.

Dan
 

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Discussion Starter · #3 ·
blackmaxima88 said:
huh... I know sometimes a bad coolant temp sensor can cause a high idle. I'd check that. also, check your vacuum lines for cracking. if you still haven't narrowed it down, try doing a self-diagnosis on the ECU. when I had my 88 max, it'd idle around 1500. I drove myself nuts checking this and replacing that. turns out it was a cracked vacuum line.

good luck.

Dan
I test the coolant temp sensor and it's ok. don't seem to have any vacuum hose cracked. i heard that it could be to program the ecu for the idle and the tps. anybody know how? thanks
 

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Have you checked to see if the throttle cable is sticking? Otherwise you have done what I would do in terms of checking the TPS. Next time it does it try loosening the screws on the TPS and turning it "down" or the direction that will lower the TPS voltage. See if that fixes it rather than unplugging the TPS.
 

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mine is doing that at the moment... it is the throttle cable, cuz when its idling at ~2K, i put my foot underneath the gas and kinda kick the pedal back up, and the rpms drop down to ~800rpms...

anyone know if changing the throttle/clutch cables (if applicable) is a difficult task?
 
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