Question about 1989 Toyota Tercel Liftback
Best way is to have a mechanic hook a oil pressure tester to the motor and see if the readings are within specs.
Posted on Aug 26, 2010
Yes, I think you are thinking right, it can be that the oil pump pressure is down.
If the oil was changed recently with the oil filter then there is no question of a possible clogging of the oil from the sump.
But you can check the oil pressure switch point for the ildling pressure with an external oil pressure guage. If this is low then the engine has to be taken out to confirm the drop in the pumping.
It must be done without the car being used at all as you might end up damaging the crankshaft and bearings with poor oil pressure.
Hope this advice helps you to decide.
Posted on Aug 26, 2010
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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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