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more high idle issues


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On another thread: http://www.comancheclub.com/forums/viewtopic.php?f=2&t=21523&p=222210#p222210, I thought I had found a vacuum leak at the brake booster. I plugged the vacuum line today (and replaced the check valve) but the engine is still idling high. I cleaned the IAC sensor and the throttle body, so I don't think those aren't the issue.

Is there another vacuum line to check? :hmm:

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one thing to check is the adjustment on the TPS (throttle position sensor)

you'll need a voltmeter to backprobe the wires at the connector and find out if it's reading properly. see this website for more details. http://www.lunghd.com/Tech_Articles/Engine/Basic_Sensors_Diagnostics.htm

 

if that sensor is adjusted correctly then we can move towards a manual adjustment, it's possible someone was screwing with it before you bought it.

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check the bolts/nuts that hold on your intake and exhaust manifolds, i had some loose ones on mine. as soon as i tightened them up my high idle went away.

 

The front bolt was loose. The idle is much better now. I should have thought about that. My old Honda CB350 had bad leaks around the intake boots. :doh: I got wrapped up in the idea of a vacuum line issue. Thanks guys! :bowdown: A few test laps around the neighborhood and it's running well. Now I can get back to the wiring issues!

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