Question about Jeep Grand Cherokee

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Jeep Cherokee 1999 4.0 L 130K miles, I put new S. Plugs. Still the same problem and now the engine wile driving shuts down. I get engine code 171 and 174, what should i do? Thank you very much if you can help!

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I'd have a fuel pressure and delivery test done (with the proper gauges) Likely you have a blocked filter, or failing pump. If you are a tech or do a lot of repair work the gauges are a good investment...if you only work on your own cars, gauges are expensive and you may get to use them once every five years, though one hour shop labor charge for testing will generally cover gauge cost, but likely shop will do other tests as well. How you go on this is your call.
Since I'm here and you are there, my answer is my best educated guess. If actually working on your vehicle I would never change the pump or anything else unless I tested it first.
Good luck!

Posted on Sep 25, 2009


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