Question about 2005 Jeep Grand Cherokee

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2005 jeep grand cherokee is missing at 35mph to 45mph giving code 300 have changed spark plugs tested vaccumm and tested compresion also coils everything seems ok what else could it be

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Upper an lower cam sensor

Posted on Jul 31, 2010

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Have a 2004 jeep grand cherokee larado miss firing.changed spark plugs and coil pack. Still have misfire. Any suggestions?


misfires are more from faulty injectors than plugs
check/ clean the injectors and run a can of quality cleaner through the system
run the fault codes

Jul 02, 2017 | Jeep Cars & Trucks

1 Answer

I have a 2005 Jeep Grand Cherokee Laredo it misfires when idleing I changed the plugs yesterday it didn't start doing that until I changed the plugs


Carefully check your routing and make sure that all spark plug wires are attached to the correct spark plugs otherwise your firing order will be mixed up and cause the issue you are having. Also make sure that the wires are firmly seated on the coil packs or distributor, whichever is on your vehicle.

May 28, 2015 | 2005 Jeep Grand Cherokee Laredo

2 Answers

My 1999 jeep grand cherokee skips after changing the coil and spark plug,what could be the problem


get plug wire tester at parts store and test plug and coil wires if there bad change them to also did you check plug gap?

Nov 21, 2014 | 1999 Jeep Grand Cherokee

1 Answer

2005 jeep grand cherokee 3.7 liter p0303 code


Most likely ,even though you have a 303 code, that
it wasn't that cylinders coil that failed

Need to put the old coil back & walk new one to different
cylinder or use a professional scan tool in Mode $06 ,to see
the misfire counts on all cyl's

Unrelated,I would loose the front O2 sensors after 7 years
& 100,000 miles

Never need to do plugs to diagnose problems
Only do plugs every 3 years a preventative maintenance

May 26, 2012 | 2005 Jeep Grand Cherokee

1 Answer

Ok I have 2002 Jeep Grand Cherokee, I have replaced the spark plugs and the coil rail but still getting the code P0351 and I was wondering if this could be caused by some kind of sensor?


The code indicates the coil pack or spark plug is malfunctioning. You can test this using an additional person. by removing the coil pack and spark plug, place the spark plug into the coil pack and ground the tang on the spark plug to the engine. Have someone start the engine and watch for a blue spark. if there is no spark, then the coil pack is malfunctioning. There is also ways to check the coil packs using a multimeter.

also, bee sure you didnt crack the ceramic part of the plug during initial installation.

Aug 01, 2010 | 2002 Jeep Grand Cherokee

2 Answers

91 jeep no spark


wd 40 your flywheel sensor plug

Sep 02, 2009 | 1996 Jeep Grand Cherokee

2 Answers

2002 Jeep Grand Cherokee Lardo misfiring


You say you changed the cam sensor. A1391 code is a crank sensor on the top of the trans. bell housing.

Feb 22, 2009 | 2002 Jeep Grand Cherokee

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