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repairpal.com > Problems > Mercury > Sable 2002 Mercury Sable100,000Visitor. Idle control valve makes the idle high and with foot off the accelerator car runs at 40-45 MPH. I disconnected the electrical ...
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It seems like the problem lies with the engine management system, rather than the brakes. Given that you've already replaced the MAF, MAP, and TPS sensors, here are some other things to check:
1. Vacuum leaks: Inspect all vacuum lines for cracks or damage that may be causing a leak. A vacuum leak can cause erratic idling, poor acceleration, and stalling.
2. Idle air control (IAC) valve: The IAC valve controls the engine's idle speed. A malfunctioning IAC valve can cause the engine to stall during idling. Try cleaning the IAC valve with carburetor cleaner and see if the issue is resolved.
High idle is most often caused by an engine vacuum leak, use a can of carburetor spray and spray it around the intake manifolds (upper and lower), if there is a leak you will hear a change in the idle speed
TPS.....Throttle Position Sensor will normally cause this problem.....IAC....Idle Air Control sensor will also have an effect on the idling.....However I would say it is the TPS....IT is rare that both have failed but it is possible.......You should have a check engine light on...?...
sounds like either ur iac /or ur tps more then likly ur tps, throtle positioning sensor it controls ur feul intake more feul harder the engine runns, but iac idle air control it tells car more air higher idle less air tells tps less gas lower idle there all linked together have it put on a scanner that will narrow ur possiblities right down to the problem
Check IAC sensor and TPS and MAF sensors if IAC is ok. IAC will amke your idle go up and down all crazy and cause stalls when slowing down or releasing throttle but TPS and MAF also can effect this.
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