If you don't find any vacuum leaks, try this. If the engine will idle high one day and not the next, or it idles high until you turn the engine off and start it again, you might have an electrical prob. Try this, while it is idling high, pop the hood and unplug the IAB valve. If the engine idles low when you unplug it, you know it's not a vacuum leak because the computer is intentionally opening that valve(or the valve is dirty and needs cleaning). If it idles low when IAB is unplugged try setting your TPS. If you've set your TPS and it still idles high, check wiring connections.(two big connectors behind intake, they should be cleaned) I had a bad ground to my TPS for a while and it caused my idle to stay high randomly. Cleaned the connectors and it helped, finally I ran new wires for the TPS and it works great now.
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Michael Black
Quantum Motorsports
Norman, Oklahoma
1988 Merc Cougar 5.0 HO, Ported and Polished E7TEs, 2.25" duals w/ 2 chamber flowmasters, T5 tranny
New E/T!!!
14.626 @ 94.94mph, 2.194 60' time, a little better than last time. Keep in mind this thang is heavy (3590lbs) Finally 14s!!!!
[This message has been edited by QuantumMotorsports (edited 03-19-2001).]
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