Question about Hyundai Sonata
Have u cleaned the idle speed control valve and the throttle valve? this is the number cause of this next is the ECT sensor, try the cleaning, 90% of time it works. if this doesn't clear the problem have the idle speed control air-bypass valve replaced (IAC for short)
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 Dec 11, 2009
The two major problem are intake manifold gasket leak and vacuum line leak. This will make the car ran lean.
Rich running can cause by old air filter,old injectors,worn injector o-rings.
I would ran two tank full of Chevron with Lucus fuel injector cleaner.
This is take care of uneven injector spray pattern.
Lucus FI will take care of the carbon deposit inside the engine head.
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Posted on Dec 11, 2009
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Posted on Jan 02, 2017
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