91 tempo gl 4 cyl. 175,000 miles...I have a hesitation while driving..it's fine when accelerating and idling. .some say TPS but not sure..my power wire on alternator was broke but it's fixed now

Asked by Oct 29, 2014 at 07:42 PM about the 1991 Ford Tempo 4 Dr GL Sedan

Question type: Maintenance & Repair

3 Answers

96,685

TPS is a common failure, also ITS, you should have the codes checked It could help with further diagnosis, it could save you a few bucks.

What is an ITS and there is no light on for code

96,685

ITS is the idle tracing switch, it's built into the ISC Idle speed control. The check engine light does not have to be on for there to be a problem, that is one of the drawbacks with OBD1 Fords, a sensor can be way out specs but show changes in readings as the vehicle is driven so the ECM see the changes, thinks it is accurate so it won't set a code, also wiring degradation can cause drive ability issues and not set codes. a breakout box is very necessary when tracking down erroneous sensor readings or internal wiring problems. Hope I didn't rattle you too much.

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