Question about Toyota Corolla
Wont rev clanly from cold until over 3000 rpm very hesitant pulling away once going seams fine whilst reving. ticks over and starts fine holds back a bit when blipping throttle when warm
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Posted on Jan 02, 2017
SOURCE: not reving high on cold start
Here is the most common cause of surges and stalls and low idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk 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 Feb 06, 2009
We are having the same problem. We are right now changing the crankshaft position sensor along with the intake and manifold gaskets.
Posted on May 14, 2009
the idle air control valve may be bad or just needs cleaned out. idle air control valve acts the same as a choke. if it is messing up it will cause engine not to run right.
Posted on Jan 27, 2010
sorry but you have tried everything i would have done except that i would have checked the engine breather pipes for deterioation like perished or soft and collapsing .you would be surprised how often this is the main cause of this sort of problem
Posted on Aug 21, 2010
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