4.0 OHC idle

[Michael Rogge]

Recently purchased 93 ranger with the 4.0 OHV, manual trans. The engine idles somewhere above 1500 rpm at startup (tach gets stuck above 1500) and only drops to 1400-1500-ish once warm. This seems kind of high, every time I change gears when it feels right the revs don't drop enough to make a smooth gear change. What are the most common issues to cause this?

 

[Michael Rogge]

Could a loose PCV valve cause this?

 

[Uncle Gump]

93 4.0L would be an OHV... not the SOHC. Unless someone swapped in a newer engine.

Anything that creates a vacuum leak will cause a high and or erratic idle speed.

 

[Michael Rogge]

93 4.0L would be an OHV... not the SOHC. Unless someone swapped in a newer engine.

Anything that creates a vacuum leak will cause a high and or erratic idle speed.

Thanks, I hit the wrong letter on my keyboard