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Old 07-12-2016, 06:15 PM
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Problems ha!

Ok so a little background. First im newish here. I have a 2007 jeep grand cherokee 4.7l v8.

It has roughly 145k miles. For the past couple weeks it has been idling rough, hesitating on acceleration, misfiring etc. Now it only does this in the afternoon when the outside temp is hot. Morning time i can start it up run it no problems.

The codes that pop up are p0300 random misfire, p0202, p0204, p0206 (injector circuit open # 2 4 and 6) and most recently p2314.

Things i have done/troubleshot:

Fuel pressure is good around 55-60.

All injectors measure within the resistance and "click"

Spark plugs changed less then 1k miles ago.

Egr valve changed (broke connector off it).

Battery and alternator are good. Fuses all check out.

Anyone have any ideas?

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  #2  
Old 07-15-2016, 09:32 AM
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Re: Problems ha!

Have you replaced the coil packs?

Do you have a vacuum leak?

Water in your fuel system?
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Old 07-21-2016, 08:29 AM
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Re: Problems ha!

No vacuum leaks (ran the vacuum guage on it). Holds steady at 21". "Snap test" shows good. And also 3k rpm test shows good vacuum.

Have not replaced the coil packs due to it being a random misfire and not a "specific" cylinder. (Yes one of the codes is for a certain cylinder) however, there are a total of 4 electrical codes.

No water in the system. Drained tank and checked the fuel.

Im starting to think the issue is electrical based.

Some more observations:

Pcm is very hot to touch when this is happening. Engine is not overheating nor is there coolant in the oil etc..

Obd readings are showing kind of weird on the fuel trims. Short term on bank 1 will read between 10 and 5 at idle. I noticed the LTB1 was reading 0 at idle yesterday. Bank 2 trims are about the same.

Egr pct is 7.1 at idle and fluctuates while moving.

Gonna do a compression test but i dont think thats going to give me any answers.
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