86 cj7 Loud squeal when idlng

[bgrinder]

I have an 86 cj7 with 4.2 inline 6. California model ( Lots of vac. lines) I just started getting a very loud squealing sound . only when idling or low rpm. Goes away when driving. Any ideas?

 

[Renzomatic]

I have an 86 cj7 with 4.2 inline 6. California model ( Lots of vac. lines) I just started getting a very loud squealing sound . only when idling or low rpm. Goes away when driving. Any ideas?

I have a 2001 wrangler, and all of a sudden, I started getting a high pitch whine/squealing that I was able to track to my pulleys. I ended up putting a bunch of silicone spray on them, and the issue went away, hasn't come back since.

 

[mark sr]

I used to have a 1990 cherokee with a 4.0 that was prone to squealing. The silicone spray was only temporary on mine. Replacing the serpentine belt would stop the squeal. I found that the better belts went longer before the squealing returned than the lower priced ones.

 

[TLCJ5]

As stated it is probably a belt squealing. Check the tension on the belts. A loose belt will slip at low RPMs causing a squeal, as the RPMs increase the squeal will often go away. Also if any mods were done that affect the pulleys(different alternator, power steering pump etc.)make sure the pulleys are straight & perfectly inline. If all else fails some spray-on belt dressing may be needed.

 

[superj]

and, to help pin point, hold a bar of soap on the underside and top of belts to see if squealing goes away on serpentine belts, or just underside, on v-belts

 

[bgrinder]

I found the problem. It is a leaking intake gasket. I am going to replace tomorrow.

 

[bgrinder]

Replaced intake/exhaust gaskets. Purrs like a kitten.