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Santos

Santos 3/23/2011

1999 Jeep Grand Cherokee Limited 6 Cyl 4.0L

Engine

Hello my jeep backfires when it's cold. Once its warm. it stops. Then if it seats for an hour it does it again

4 Answers


Team Associated

Team Associated 3/23/2011

hmmmmmm........first i need to know if the back fire is coming from the intake or exhaust...A backfire occurs when there is an imbalance in the air to fuel ratio required for your vehicle to operate properly. If the fuel mixture is too lean (not enough fuel) you may have a backfire in the intake, or too rich (too much fuel) you may get a backfire out of the exhaust system. Most backfires are easily repaired by correcting the imbalance and providing a greater or lesser percentage of fuel to the mixture.

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david

david 3/24/2011

check cam shaft and valve spring

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Team Associated

Team Associated 3/24/2011

It can be that your emission control system is not functioning properly. Your ignition timing is incorrect, faulty secondary ignition system (like cracked plugs, faulty plug wires), your fuel injection system is malfunctioning. You have vacuum leaks at the injectors, intake manifold or IACV (intake air control valve) or lastly it may be that your valve clearances have been incorrectly set or are sticking.

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vitalnetwork01

vitalnetwork01 10/7/2013

need to know the wire for spark plug for 6cyl grand ck lo 1996

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