1989 Jeep Cherokee

You may need to run the engine at a higher rpm when you first start it (put it in neutral and run it at about 1500 rpm) until it warms up. If your jeep cherokee has a power outlet at the front end (should be located under your bumper, it has a very short cord), your engine is equipped with an engine block heater. Plugging this into an outlet via extension cord will warm up your engine (give it a few hours to work, like plug it in before you go to bed) before you start it. If you don't have one installed, I believe you can have them installed aftermarket, but they're pretty pricy. I'm not exactly how much they are though.