Q: I went to an autoparts store and checked why my check engine lights on, they connected the machine and said 4 things could be wrong...... the spark plugs, vacuum leak, injector fault, or high or low fuel pressure. I have never heard of the 2 and 4th one so I just wanted to see what these are and if they're expensive to fix if it ends up being one of those.
A: You need to find out what the actual trouble codes are. It may be that there is only one code and the the faults they specified are the generic descriptions that could refer to several different vehicles. Find out the code numbers and join http://www.jeepforum.com Post up the codes in the Grand cherokee forum and you will get good advice about how to rectify your problem(s) from people who's had the same problems. Make sure you include as much info as you can in the post as it will help people answer - like how it drives, what speeds or revs any problems manifest, engine cold,hot etc. A forum is better for questions like this as people can ask you questions, make suggestions, and you can give feedback about things they've suggested.
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