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  #13  
Old 01-04-2014, 07:31 PM
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Re: V8 Miss-behaving....

Is your key in the "on" position when your checking the reverse lamps? If it is not they will not illuminate. Before you go digging for grounds, check your bulbs! besides, its MUCH easier to check for power and ground at the connector at the lamp housing than climbing under the jeep.

By your symptoms I would venture to guess that you have 1 or 2 rocker arms spit out. I would lean away from an electrical issue for the simple fact that all 3 hit at the same time, they ALL use the same power source, and each has its own ground driver in the PCM. I would pop the valve covers off and give it a look-n-see.
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  #14  
Old 01-05-2014, 09:52 AM
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Re: V8 Miss-behaving....

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Originally Posted by 2005JGC View Post

By your symptoms I would venture to guess that you have 1 or 2 rocker arms spit out. I would lean away from an electrical issue for the simple fact that all 3 hit at the same time, they ALL use the same power source, and each has its own ground driver in the PCM. I would pop the valve covers off and give it a look-n-see.
Was thinking about this, but OP mentioned that he drove 1000 km without problems in between.
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  #15  
Old 01-05-2014, 09:05 PM
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Re: V8 Miss-behaving....

Hey frank, you could be right but the way he worded that made it sound like the 1k mile trip was prior to any failure. The way I read what he wrote was that he drove 800km and it runs like crap, and still runs like crap, but he drove 1000km the day before with no issues. Again, I was having a bit of a difficult time following.
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  #16  
Old 01-06-2014, 04:15 AM
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Exclamation Re: V8 Miss-behaving....

HI Guys,

It went like this:

The day before I plugged the traior in, I returned from a 1000km round trip with no hastles what so ever.

The next day I plugged the trailer into the trailor plug to make the trailor lights etc work. Didn't check weather the trailor lights worked as I was in a hurry, Jeep started normal, all 100%. Then 800 meters (1/5 mile) down the the road, she started missfiring and died on me.

Managed to pull to the side of the road, immediatey thought of the trailor, and unplugged it. Started the Jeep and had the misfiring happening since then.

Checked so far:
  • Swopped coils with firing cylinders - Coils are fine
  • Misfires are only on cylinders 1,2 & 4.
  • Checked indicated ground connecton under passenger seat - 100%
  • Found a loose connection on the EVIC power line, repaired, Overhead display works 100% again.
  • Reset the PCM, misfire continues and codes return.
  • Checked Reverse light globes - All Good, cant see issues with the lights wiring...
Codes remaining now:
  • P0300
  • P0301
  • P0302
Any Ideas...?
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  #17  
Old 01-06-2014, 05:52 AM
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Re: V8 Miss-behaving....

As the EVIC was a separate problem, the reverse lights probably are as well. Could be the fuse, a wire problem, or the reverse lights switch in the TRS/solenoid block. Check fuse 20 on the junction block first. If ok,
you could remove the large connector on the left side of the tranny and connect point 1 (12V) to point 6 (ignition should be in run, take care to not make a short). If lights come on now, the TRS/solenoid block should be changed.
Then regarding the misfires, it doesn´t show #4 to be misfiring. But what 2005JGC mentioned is still a possibility, that rockers have fallen off. Could happen due to sticking valves, or after overheating (could drop a valve seat)
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  #18  
Old 01-06-2014, 05:56 AM
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Exclamation Re: V8 Miss-behaving....

Quote:
Originally Posted by Frango100 View Post
But what 2005JGC mentioned is still a possibility, that rockers have fallen off. Could happen due to sticking valves, or after overheating (could drop a valve seat)
I Will look into it thanks Frank!

I just have one concern here, and that is the fact that there is no spark on the coils...?

Would fallen rockers cause a 'no spark' situation? Sorry for all the questions!
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Old 01-06-2014, 02:53 PM
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Re: V8 Miss-behaving....

No, fallen rocker arms will have no effect on the sparks. I would check all the wire bundles in the engine bay for chaving. If ok, i would suspect the PCM.
But did you actually check for no spark on the respective cylinders? It could be fuel injector related as well.
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  #20  
Old 01-06-2014, 11:25 PM
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Re: V8 Miss-behaving....

How did you test for spark... more times than not people do it wrong so I just want to verify your doing it right. you MUST ground the spark plug, If you dont have it grounded your going to burn the coil up right quick and 15k volts is going to go finding whatever path to ground it can find (yikes!).
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  #21  
Old 01-07-2014, 02:53 AM
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Quote:
Originally Posted by 2005JGC View Post
How did you test for spark... more times than not people do it wrong so I just want to verify your doing it right. you MUST ground the spark plug, If you dont have it grounded your going to burn the coil up right quick and 15k volts is going to go finding whatever path to ground it can find (yikes!).
Ive been zapped with spark plug voltage on a motorcycle and it's not something one soon forgets!
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Old 01-07-2014, 05:42 AM
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Exclamation Re: V8 Miss-behaving....

What I did:

I frist unplugged the coils one by one, listening for change in the idle, this lead me to believe that cylinders #1,2 & 4 where not firing because when I unplugged their coils, there was no change in the misfiring idle.

I then took the coil from cylinder #1 and swopped it with cylinder #5 and started the Jeep, again unplugging coils while idling, no change when unplugging #1, but change when unplugging #5, leading me to believe that the coils are fine.

I did not take the plugs out thou. I dont believe it to be injector related as you can smell the overfueling of the unburnt fuel.

Hopes it makes sense? This has me baffled. I need to spend some time under the bonnet going through the harness.
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Old 01-07-2014, 06:31 AM
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Re: V8 Miss-behaving....

Did you remove the respective plugs and check for condition?
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  #24  
Old 01-07-2014, 06:36 AM
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Re: V8 Miss-behaving....

Quote:
Originally Posted by Frango100 View Post
Did you remove the respective plugs and check for condition?
No I didnt.
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