009starts fine checked tps and iac. changed fuel filter and tuned up and checked timing. wont idle under1200 rpm and it doesn't lunge forward when put in gear so why wont it idle down
Re: 009starts fine checked tps and iac. changed fuel...
U need to take and remove the air induction tubing and clean the throttle and butterfly w/ a toothbrush and throttle body cleaner do not use carb cleaner this will ruin sensors
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Did you check fuel pressure? New fuel filter? Clean Air Filter? Do you have vacuum leaks? Sounds like a vacuum leak because the IAC won't hold the idle steady ,because it is being told not to. Have to find out why. Also how did you do the compression test. Remember #3 is lower than the others. Why? Put a professional scanner on the TPS and also look at the spark with an oscilloscope
I faulty Idle Air Control valve (IAC) can cause these specific symptoms. You could try diconnecting the IAC valve (usually near the throttle body) and regulating the idle yourself. If the fluctuations go away and you are able to hold a constant idle position with the gas pedal (if vehicle will start), the IAC is the problem.
If you have a high idle and lunging...that usually happens when there is a leak on the intake manifold side allowing more air to get in, then the computer senses the increase in air and adds more fuel. There in turn has to be one more failure in the system to allow the idle to run away, may be a tps sensor (throttle position sensor) or something down the line.
More times than not the IAC(Idle air control)which opens further to let additional air in the compensate for increased fuel...the TPS(throttle position sensor) and the IAC work in unison...if you have a manual on your vehicle you can look up the the testing of these item before you go and buy
The IAC valve requires resetting . First locate the IAC valve located on the side of the throttle body and has 4 wires going to it .Procedure is as follows Ignition key on ,unplug the IAC ,turn key off ,reconnect the IAC .do this 3-4 times .restart the car and hold the rpm at 2000 rpm and slowly lower until it idles by it self .
recommend you check for vacuum leaks
i have and also replaced tbi base gasket
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