Too fast an idle... what could it be?

[Scruffy]

My '88 Grand Wagoneer idles too fast I've noticed. There's no forward play in the throttle linkage, so the throttle isn't binding up. The throttle return spring is working fine. The high RPM continues well after the Jeep warms up, so I don't think it could be the choke (electric). I can't figure out what might be causing this. :confused:

My '82 Jeep Wagoneer has the exact same intake and carb (Edelbrock 4V 650 CFM 1406 and performer series intake) as the '88 and the same AMC 360 engine. The only real difference is that the former owner of the '88 GW installed an Edelbrock high-performance camshaft kit. The '82 starts with the same idle, but a quick rev of the gas slows the idle, this is not the case with the '88. The Jeep runs smooth and has plenty of power, but I am concerned about the excessive RPMs during idle. The gas consumption of the 360 is bad enough as is, the high idle isn't helping (I am also concerned with the life of my breaks with this problem).

[Jeep Jeep]

Scruffy, Have you checked the choke? Sounds like something is restricting the fast idle cam.

[jeepjake]

Check for vac leaks or too much advance.

[64Trvlr]

You did try lowering the idle with the idle screw? Is the throttle linkage binding on anything? Are you sure the choke is pulling off ok? Nothing under the pedal in the cab? These are things that I've found that have caused high idle on other vehicles.
:cool:

[No_Ecm]

My high idle speed was caused by a vacuum leak between the carb and the intake manifold. I found the leak by spraying carb cleaner between the intake manifold and the carb.


Good luck!!!