1999 Jeep Cherokee XJ, in my opinion one of the toughest engines in American car history... that…

ForrestsXJ

1999 Jeep Cherokee XJ, in my opinion one of the toughest engines in American car history... that being said it has its issues. Recently I drove about 45 minutes on the freeway, got off and stopped at a drive through. The jeep then heated up after sitting in the drive through line so the mechanical fan kicked on. Then I parked and shut off the jeep for about 12 minutes while I ate. When I stated the jeep to leave, it began running really rough, shaking the motor and whole vehicle. I shut it off and tried to start again and the same thing! After popping the hood and looking at it do its thing for a good minute I slammed the hood and it stopped (coincidence?) It then had no further issues. I read it could be "heat bake" where heat from the manifold causes the gas in the 3 injector to boil because of its location and it stopped because eventually fresh cooler fuel flushed it out.

I've had the jeep for 6 years and it hasn't done anything like this before.

While on the subject of fuel injectors, a lot of folks upgrade their injectors from the old 1 port OEM to 4 port injectors, often from the 5.0 mustang for better efficiency. Is this a worth wile upgrade or a waste?

What do you think about the 4.0 inline 6 on the Cherokees, what are the best ways to take care of it?

Comments (1)
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ScottyKilmer
ScottyKilmer

Editor

it's a worthwhile upgrade. those 6s are very good engines if you take care of them. Unfortunately the rest of the vehicle is not as well made