Question about 1998 Mitsubishi Galant
Get a Haynes repair manual and look up idle speed control sensor. I would advise you to go to your local auto recycling yard because the price of that sensor is about $300.00 bucks.
Posted on Mar 26, 2009
Check vacuum line--egr valve
Posted on Feb 22, 2009
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Posted on Jan 02, 2017
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Here are the most common causes of idle surge, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake
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