Idle Speed Seems Low

[fossilfool]

Hi
Could anyone let me know what the normal idle speed is for the 4.0 sohc. Mines a 2000 year and once really warmed up, it idles about 500 to 600 rpm.

Seems a bit low. I'm planning on doing the OOM12 timing chain tensioner mod and am hoping the new gaskets on the intake manifold might help.

I'm hoping also that the low rpm is contributing to the timing chain noise at warm idle.. If I hold my foot on the gas and keep 800 rpm, theres no timing chain noise at all.

Any help or guidance would be much appreciated.

Great website guys - loads of good stuff.

Regards

Barry

 

[Turdle]

Have you tried this?

http://www.explorerforum.com/forums/showthread.php?t=84220&highlight=IAC+valve

I think that idle speed is fine-in fact the tach may be a bit off.

 

[aldive]

Hi
Could anyone let me know what the normal idle speed is for the 4.0 sohc.

With Automatic Transmission
Hot Idle 750 - 830 RPM

With Manual Transmission
Hot Idle 716 - 810 RPM

 

[calisoundmix]

just another POV, my 98 SOHC explorer idles around 600 RPM, the gauge shows it closer to 500 but my computer shows an idle between 615-700 at most.

 

[SideWardPrune]

When i start the car. It runs but when it begins to idle it acts like it wants to putter out. It has never stalled but it just seams to be running to low of RPM's when it is cold or hot. Any Quick Fix's?

Best Regards,
Landon