Question about 1990 Jeep Wrangler
1990 jeep yj 2.5L engine blows oil from under oil filler cap. when I remove the cap while engine is running it lets air out.appears to be building back pressure. replaced pcv no help. big oily mess under hood. engine does not smoke the usual blue smoke if rings were bad also dosen,t smoke when cranked after sitting over nite.
I had the same problem. I changed the pcv valve and checked the hose. It still did the same thing. Then I checked the metal tubing that the hose connects to and found it was full of hardened gunk. I sprayed PB Blaster into the tube let it soak for awhile. Then took an old choke cable, put it on a drill and ran it into the tube like a drain snake. It took a while of doing this over and over but eventually got it cleared out. Now, no more oil all over the engine and hood compartment.
Posted on Mar 21, 2009
If you have changed the pvc valve with no success you should check the breather hose to the manifold. Also check that the hole is clear in the fitting on the manifold that the hose goes onto. Failing that its most likely the rings I'm afraid. A cylinder leakage test would be the best way to check this but is specialist equipment. No more than 15% leakage is normal
Posted on Dec 12, 2008
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Dec 08, 2013 | 1994 Jeep Wrangler
Nov 29, 2010 | 1987 Jeep Wrangler
Oct 27, 2009 | 1992 Volvo 940
Oct 26, 2009 | 1988 Mitsubishi Galant
Sep 26, 2009 | 1990 Nissan Maxima
May 17, 2009 | 1990 Jeep Wrangler
1,111 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: