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my sister gave me her Jeep Cherokee Laredo circa 2000. She said the engine was rebuilt last year, but now the check engine light is on and it's running rough. Computer says cylinder #6. Should I just get a tune-up or should I suspect a chronic problem with this model?

Answers from the Automotive Experts

Amanda J. Pierce, MBA Liesl, You may need to replace spark plugs, or have your coil pack checked in relation to #6 cylinder for further diagnosis.

Audra Fordin, Owner at Great Bear Auto Shop Hello Liesel, Your sister is very nice for giving you her car. The check engine light is not a great disaster that should cause you to condemn the car. If your codes came up indicating your in need of a tune-up, sounds like an easy fix to me. Go for it. It's alot less to fix than it is to get another car. Becides, after tuning it up you will probably save money in gas too. Mechanically yours, Audra

Laurie Sarno, Co-Owner at Super Girls Auto Hello Liesl- the issue could be a very simple fix ie./ spark plug, plug wire or fuel injector on that cylinder - the 4.0 engine is one of the most reliable engines ever made- hope this helps ; thanks Super Girls Auto.

Lori Johnson, Owner and Instructor at Ladies Start Your Engines Dear Liesl, See if you can find out where the engine was rebuilt. There may still be a warranty. If this is the case they can check out the problem. Otherwise I would suggest having a technician do a diagnosis. Just doing a tune up may not fix your problem. You need to know what the problem is with cylinder 6. Then you can decide if the problem is worth fixing. Lori Johnson

Suzanne Grego, Technician at City of Philadelphia Fleet Management Liesl Wulff, I suggest that you do not do either. You can look into the exact year and model and find out what glitches are known of for that vehicle - almost all makes and models have a few known faults. As far as a tune-up, that may or may not fix the problem. First, you need to find out exactly what is going on in cylinder #6. Is it just a bad spark plug, or are you loosing compression? In this case, a little diagnostics will definitely be worth the time and money to correct the issue. Suzanne

Kathryn van der Pol, Owner/Manager at Adolf Hoepfl & Son Garage Dear Ms. Wulff, Jeep Cherokees are generally long-lived and enduring but a check engine light with a rough running problem should not be ignored. First, the light indicates an emissions failure. Next, by driving it with it running rough, you could be damaging more of the emissions system. A tune-up could be a solution, but you need a technician with diagnostic knowledge and the proper scanning equipment to determine why cylinder #6 is misfiring. He will do inspecting and testing. There are so many causes of misfires ranging from fouled spark plugs to clogged fuel injectors that it is impossible without seeing the vehicle. My best advice is to take it to your technician before you do any further damage. If the check engine light starts FLASHING, do not drive the vehicle. I wish you the very best in a quick and complete repair. Kathryn van der Pol

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