Question about 1989 Ford Mustang

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Hi, i have a 2.3 l 1990 mustang it failed smog cause of instability. it at 2000 rpm it will raise and fall it wont stabilize. i cleaned the i.a.c throttle position sensor. egr throttle body map sensor. compression hot #1 160 #2 165 #3 150 #4 160 so compression is all good. o2 sensor also is good. so im at a loss has a complete tune up. timing set at 10 btdc help me plz.

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  • Dave  C
    Dave C May 11, 2010

    You have a vacuum leak, check the hose between the intake and PCV valve.


1 Answer

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

Posted on Feb 07, 2010

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