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Cylinder 3 and 4 misfire, vehicle goes into limp mode.

Customer Question
Hi cylinder 3 and...

Hi cylinder 3 and 4 misfire, vehicle goes into limp mode

Mechanic's Assistant: How many miles are on the car? Is it a steady misfire? Or random?

Random misfire , 81K

Mechanic's Assistant: What is the model/year of your Jeep?

04 grand cherokee 4.0

Mechanic's Assistant: Are you fixing your Grand Cherokee yourself? What have you tried so far?

New injectors,coil packs,map sensor,plugs,cam and crank sensor all parts mopar

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Nothing i can think of right now

Submitted: 7 months ago.Category: Jeep
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Answered in 29 minutes by:
11/27/2017
Jeep Mechanic: roybelding, ASE Certified Technician replied 7 months ago
roybelding
roybelding, ASE Certified Technician
Category: Jeep
Satisfied Customers: 7,767
Experience: My knowledge of Jeeps from the early 60's till present. Love to help people with there issues.
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hello, my name is ***** ***** I will be glad to assist you. please allow me a couple of minutes to gather some basic info.

Roy

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Jeep Mechanic: roybelding, ASE Certified Technician replied 7 months ago

ok

goes into limp mode?? please explain

did you check the compression???

Roy

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Customer reply replied 7 months ago
Hi Roy, compression is 155-160 for all 6 cylinders, vehicle has a a random cylinder misfire, and cylinder 3 and 4 misfire codes. checked the wires behind the valve cover as many people say that there is a bolt back there that can rub thru over time. Those were all good, It only seems to go into "limp mode" when the engine is cold. When this happens the engine light blinks at you and the jeep can not rev over 3000 rpm but is still somewhat driveable. I can clear the codes and sometimes will be fine for a day or 2 then it will happen again.
Jeep Mechanic: roybelding, ASE Certified Technician replied 7 months ago

good morning

is 303 and 304 the only codes???

have you checked the fuel pressure

Roy

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