Question about 1992 Toyota Paseo
Here are the common cause of surges, 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.
Posted on Oct 01, 2009
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Posted on Jan 02, 2017
Sounds like a plugged up catalytic converter. The only way to tell is have it hooked up to a code reader( at most part stores or small town shop) and it will show if the O2 sensor is getting a bad reading behind the cat.
Posted on Jul 17, 2011
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