Q: Hi Ryan,
My warranty is about to run out on my 2005 Jeep Liberty. Previously, the dealership worked on my vehicle and broke off the crank shaft bolt in the crank. They had to rebuild my engine. About a year later, my engine started running poorly and was misfiring badly. I took it back to have the dealership check it out, and they found a piece of shop towel they had left in my fuel rail. The shop towel was keeping fuel from getting to my number six injector. Now that my warranty is almost up, what should I have them check to make sure I don't have any more issues? I am thinking about having them do a compression check. What else should I have them do in your opinion?
A: Hi Amy,
A compression check is a good starting point, but I would recommend a cylinder leak-down test. The leak-down test will be more helpful in pinpointing mechanical issues with your engine. This test does a better job of measuring the sealing ability of your engine and will tell you if you have a) leaking rings, b) leaking valves or c) other valve issues.
Thanks for your question!