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TBI really high idle

mr_blasto

1/2 ton status
Joined
Nov 8, 2004
Posts
496
Reaction score
2
Location
Irvine, CA
Just got my motor running and it idles really really high. The motor is a 406 with a 2 inch throttle body. When I first fired it up it came on at 2k rpm, after letting it warm up it slowly (and I mean really slowly) walked it's way down to 1250-1300 RPM and that is about as low as the idle has been. If I unplug the advance plug in that goes to the distributor it will drop to 700-800 rpm. We synched the distributor with 0 advance so all the advance should be coming from my ECM, right?

I called AFI (the guys that put the kit/ecm together for me) and they said it just needed to go into closed loop and the motor just needs to get warmed up. I have a 195 degree thermostat, so once it is up to operating temp, I would imagine it should go closed loop. After driving 45 miles, it would still idle really really high. When I am talking about idle, I mean when it is in park or nuetral... in gear it drops down a bit, but still seems it could go lower. I don't have a tach, but just after getting it started I had an "engine analyzer" tool from sears hooked up to the coil and the battery and it had a tach on it.

Any ideas?
 
In case anyone cares or has a similar problem... it turned out I was sent the wrong gasket for the throttle body and it was causing a vacuum leak. A fellow ck5'er figured out the right one, and sure enough it idles great now.
 
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