Quote:
Originally Posted by nxm10
Ok just replaced the IAC and no change! I also noticed along with the above problems sometimes when im driving and i accelerate hard to pass someone i can hear a small backfire sound.
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Uh boy. You normally clean the port in the throttle body first, then you test it, then change it if it tests bad. Well, anyway you've eliminated a good possibility so what's next?
Just a list of possibilities and nothing to really latch onto:
> I'll assume it backfired out the intake. That can be an indication of a lean fuel condition. Fuel pump, injectors etc. You can connect a fuel pressure gauge to the fuel rail test port and measure the pressure off the pump. Could try a can of injector cleaner or have the injectors flushed. Lack of acceleration can indicate a weak pump.
> Could be a vacuum leak. EGR valve, vacuum line, intake gasket etc.
> Chance of a weak igntion spark. Weak battery, alternator output, loose/corroded connection, weak coil output, worn plugs or wires or both. Have the alternator and battery tested. Best battery test is a load test. You can test alternator output as stated in my first post.