Question about Jeep Grand Cherokee

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I have a 2005 Jeep with a 4.7 102,000 miles I have been having problems with random missfires. This is what I have done so far. Cleaned the fuel injectors, intake and trottle body at the dealer. I changed the spark plugs. Cleaned the air control valve on the side of the trottle body. It normally get the code when when the AC is on and driving slow in city traffic. Then it will have a rough idle. It does not like a low RMP load.

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  • paul_m_finch Sep 15, 2010

    There was no real answear. Is there a TSB for this problem? What has been the most common repair? Is there a priority for the trouble shooting?
    More detail from me it acts up mainly under low load with the AC on. The gas milage has not changed much if at all on the highway. All the spark plugs look the same, clean. Did not see much differance when the injectors, intake, trottle body and air motor were cleaned. Maybe slightly smoother idle when not misfireing.

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Symptoms:--

the engine may be harder to start.the engine may stumble / stumble, and/or hesitate.

other symptoms may also be present...There may be rough idle, sputters and stalls and jerks.

Causes:--
* Faulty spark plugs or wires
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector(s)
* Burned exhaust valve
* Faulty catalytic converter(s)
* Stuck/blocked EGR valve / passages
* Faulty camshaft position sensor
* Defective computer.

A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

As you have cleaned the injectors ,replaced spark plugs ,the air control valve etc etc so ignore that parts.But check out the other possibilities for random misfire.


check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or un-metered air getting past the airflow sensor, or an EGR valve that is stuck open.

Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Sep 15, 2010

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Since there is no "Quick" easy fix for this please read the article on random misfires and follow the diagnostics's, u should find the causes or causes using this diagnostic article. go to the link please.

http://www.random-misfire.com/

Posted on Sep 15, 2010

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