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High Idle
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Author:  TDC720 [ Mon May 30, 2011 7:08 pm ]
Post subject:  High Idle
I have a 5.7 GSI. After I throttle down and put it in neutral the RPMS stay between 1500 and 2000. Bangs like hell when shifting into gear. If I open the hatch and push on the the linkage it goes back down. Sounds like my throttle cable is sticking. But what makes me think it's not sticking is if I restart the motor it goes back to idling normally. Anyone have this same problem?
Author:  jeepman [ Wed Jun 08, 2011 8:31 pm ]
Post subject:  Re: High Idle
If it is not your throttle linkage, then it is most likely your Idle Air Control Motor. This stepper motor is controlled by the EFI computer and regulates the amount of air fed into the intake manifold when the engine is idling. In my experience, when this device is dying, it usually will not let enough air in an causes the engine to choke off at idle. Does it reset to a normal idle after every start or is it intermittent?

The idle air control motor looks something like this:
http://www.carolinaboatoutfitters.com/catalog/product_info.php/idle-air-control-valve-43505774l-volvo-penta-8343751-p-78710

If I were you, I would disconnect the throttle linkage from the engine, start it up, and operate the throttle lever on the engine by hand. When you let go, the built-in spring should snap it back to idle and you should get something around 600-700 RPM when the engine is warm. If it does not behave correctly, then swap the IAC motor and try again.
Author:  TDC720 [ Wed Jun 08, 2011 9:07 pm ]
Post subject:  Re: High Idle
Thanks Jim. I'll give it a shot.
Author:  TDC720 [ Thu Sep 08, 2011 8:59 pm ]
Post subject:  Re: High Idle
Nothing but a slight amount of play in the cable. A few turns on the eye connector to snug it up.
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