I just bought a 2000 grand Cherokee with 141,xxx miles. I got a decent deal on it as my buddy was having troubles with gas in the oil. So researching I figured it was either rings or injectors. I did a compression test and talked to a popular mechanic in my area and he said that isn’t the problem. He has replaced the injectors, but I just figured it was a faulty one from Napa. I just pulled them and did a leak down test with newspaper under neath them and that doesn’t seem to be the problem. Do you guys have any idea in what direction I should head now? Thanks in advance.

Bump

I took it to a mechanic yesterday, he has a top of the line scanner, will he be able to tell if they are spraying continually through that?

So far he has checked fuel pressure he said it’s at 53. He said it calls for 49 but there is a +/- 5 psi. I’ll let you guys know what he finds. He is the only
mechanic at his shop so it may take a few days.

Ok I’ll give him a couple days and if he doesn’t get around to it I’ll go pick it up and do it myself.

I called mechanic yesterday, he said he think an injector is firing on the exhaust strokes. You guys heard of this happening?

I wouldn’t think that a plug wasn’t firing at all the jeep runs really good