Jeep running horribly, please help!

JHKNIGHT404

MEMBER
2004 JEEP GRAND CHEROKEE
103,000 MILES

My Jeep GC a while back was showing a camshaft pos. Sensor fault so I replaced it and it made it a lil better then it was showing faulty coil pack codes (P0351,0352,0353) so I changed the coil pack with a new one but to no avail its still missing. Can anyone help!

Friday, September 16th, 2011 AT 5:03 AM

4 Replies

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

The codes you mention indicate a misfire on cylinders 1, 2, and 3. Have you checked the plugs and wires? Also, let me know what engine size the vehicle has.

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Friday, September 16th, 2011 AT 5:10 AM

JHKNIGHT404

MEMBER
11 POSTS

The jeep has a 4.0L V6 I have replace the plugs, camshaft positioning sensor, the crakshaft sensor and I have put two coil packs on it(it doesnt have wires). Just put the second coil on it and its still missing with a code of P0352 which I the #2 coil please help me im getting so ****ed off at this thing cause I can't figure it out.I even took it to the dealership and they told me that the crankshaft sensor and that the brand new coil I put in it was bad so of course I replaced them but no fix!

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Tuesday, September 20th, 2011 AT 8:45 PM

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

Since you replaced the parts, we will assume they are good. The last thing left, other than the PCM, is the wiring to the coil. It could have too much resistance cutting power to the coil.

Sorry about the plug wires. Things have changed to much over the past 10 years. Just for curiosity, did the new coil come with new splug boots? Did you check to see if #2 is arcing? I have had coil packs that work good show bad because they arced through the boot. There were small gray spots on the boot where it was happening. It's just a thought.

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Wednesday, September 21st, 2011 AT 1:49 AM

JHKNIGHT404

MEMBER
11 POSTS

The coil pack comes with boots and springs already installed on it and u just put it on and plug it in. How do I check about the resistance. Also sometimes when I try to start it and it doesn't want to start I check the codes after this and it shows P1490 & P1489 which is the high and low speed relays for the fan does this have anything to do with it?

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Wednesday, September 21st, 2011 AT 8:38 PM