Quote:
Originally Posted by fkemmerer
Is your idle air control motor connected to the same plenium that you MAP sensor is connected into? If so, this is your problem. The IAC needs a seperately feed plenium from the MAP sensor. Otherwise, when you IAC opens at idle, you map sensor will give a false reading due to the vacumn leak created in the plenium to let idle air into the motor. If you think this is the problem, shut off (close) your IAC and see if you MAP readings stablize. I bet they will. If this is the problem, let me know and I can give you some suggestions to get you motor to idle well without the IAC.
- Fred
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Fred is correct, the newer 302 and 351 manifolds are plumbed for the IAC, they don't use the main plenum. Al