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Unread 04-06-2015, 05:37 AM   #1
Buster11
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2007 CRD Misfire

I'm the new owner of a 2007, CRD Grand Cherokee. It's got an annoying problem of an occasional misfire. No codes thrown. Medium RPM (1500 to 1700) Would say more prone when accelerating or climbing a hill but not always. The Jeep always starts and idles fine.

I first thought it was the crank position sensor. Had that replaced but misfire continues. Then added the 4.7 ohm resistor to the swirl motor plug but that didn't solve the problem either. Anyone else experience this or have a most probable cause? I anticipate a trip the dealer soon but would like to have this narrowed down to a short list of probable causes.

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Unread 04-06-2015, 02:59 PM   #2
TangoTango
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Do you mean an engine miss? IF so I would start with a new fuel filter. Add some PowerService-White fuel additve for a tank or 2, and see if it still occurs.

Worst case is loose chain if it's a high mileage vehicle.
Most likely it's fuel starvation or dirty injector. Recreate the issue with while hooked up to a scanner.
usually an engine miss with throw a code.
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Unread 04-06-2015, 09:52 PM   #3
jediknight
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I would also check for a leaking injector just in case you have a seal that is going bad.
Note : Do not unplug the injector connector while the engine is runing! This is something very very bad to do. This could lock the injector into position (close or open) depending on the moment you unplugged it.
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Unread 04-07-2015, 11:27 AM   #4
Buster11
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Thanks for the tips. Mine's a low-mileage vehicle at 68,000. I haven't noticed any leaks. The engine is clean as a whistle. I'm going to re-connect the swirl motor since I know that's not the problem. I'll try replacing the fuel filter since that seems to be a low cost option and I don't know the age and mileage of the present filter. I've read a few good posts about changing the filter on this forum. I do wonder though, if the fuel filter is clogging, why the misfire would happen infrequently. Seems there would be fuel starvation problems all the time, particularly at high demand power settings. If the filter doesn't do the trick, I'll try a fuel additive. If that doesn't help, I'll be making a trip to the dealer.

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Unread 04-07-2015, 06:46 PM   #5
TangoTango
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Suggestion for changing the filter is something you need to do anyways, and it gets the possibility of a floating chunk of rust, or something blocking the fuel flow out of the equation.

Is it's a miss or a stumble? The engine could be also going into temporary limp mode for a second (if it's not a miss) in which case it's more of an engine stumble (and you will see the tack drop) then you'll need a scanner to determine what signal it's getting to shut down.
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Unread 04-09-2015, 11:09 AM   #6
Buster11
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Can't say it's either a miss or a stumble. The engine has quit several times but only when at idle. If it's got some RPM it will only stumble. Don't notice any movement in the tach. Today the ETC (lightning bolt) started to flash in conjunction with a stumble. Then got a check engine light. ETC goes off when I shut down and restart the engine but the CEL remains. I haven't yet pulled the code.

I do notice, when it stalls completely at idle, it takes a little extra cranking before it starts. As in 4 seconds versus 2 seconds, ordinarily. Do these extra symptoms provide any further clues?

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Unread 04-09-2015, 11:58 AM   #7
TangoTango
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Yes, it does mean you'll need to take a scanner and see what is going on from reading the codes.
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Unread 04-09-2015, 04:28 PM   #8
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Honeslty, i think there needs to be a rule that if your CEL come on you pull the codes before asking for advice. I mean, i think that's respectful to the community instead of us trying to guess what the problem could be.
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Unread 04-10-2015, 09:29 AM   #9
oldsmoke
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Quote:
Originally Posted by Red_liner740 View Post
Honeslty, i think there needs to be a rule that if your CEL come on you pull the codes before asking for advice. I mean, i think that's respectful to the community instead of us trying to guess what the problem could be.
I will second that. We can help you but you have to give us a chance.
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Unread 04-13-2015, 09:45 AM   #10
Buster11
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Forum,

The situation is getting worse. I've got the Jeep into the dealer today. On the way to the dealer I started with just a CEL. Then after a few engine misfires the electronic throttle control (lightning bolt) began to flash. A few more stumbles and one stall at a traffic light and the ESC/BAS lights came on. I had pulled the codes earlier as P2008 (intake manifold runner) and P0336 (crank position sensor).

The dealer service guy is implicating the wiring harness and the flex plate. He admits it's speculative and he's advocating some expensive exploratory mechanic work. I'm at a loss but would appreciate some help from this forum.

1. Anyone work with a shop in the Atlanta area that knows these vehicles and can more quickly resolve the problem? Maybe a Jeep exclusive or a Sprinter shop?

2. I'm considering trying the Green Eco Tune myself in the theory that the codes are thrown from problems solved by the Green tune (swirl motor or EGR valve).

Any recommendations or words of advice?

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Unread 04-13-2015, 11:26 AM   #11
jediknight
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I'd start with the less expensive method trials, Swirl resistor mod first. (I just saw you did it... I'd leave it there for now... Its one less code to deal with) What have you done with the crank sensor ? Flex plate (like in where the converter bolts on?) !!!! Wow !!!! Dealers are becoming more and more clueless ! Lol.
Do you have anything to log data ? Maybe this is good info here :
http://sprinter-source.com/forum/arc...hp/t-4086.html
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Unread 04-13-2015, 08:05 PM   #12
TangoTango
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Flex Plate LOL... Don't go back there...
Any good diesel mechanic can work on these.
Leave the resistor mod inplace. the p2008 is likely the swirl motor. Are you sure you conected the resistor correctly? Best to use the spade connectors just cut off one leg.
They are right about the wire harness being a possible reason. Could be the wire harness plug is loose or could be the CPS is bad or a bad wire. or just the resistor not hooked up right.
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Unread 04-30-2015, 09:20 AM   #13
Buster11
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Bought the Green Diesel Engineering Eco tune in hopes of solving the problem. This tune ignores some trouble signals from the swirl motor and EGR. Didn't fix my problem. The engine still stumbles but now it's worse. The Jeep totally stalled on me a couple of times yesterday within 1/4 mile of my driveway. The engine always re-starts promptly but twice would stall again as soon as I shifted into drive and put some load on the engine. Finally got it to carry the load and get me back home. No CEL or other codes thrown.

I'm quite perplexed. The local Chrysler dealer didn't really have a clue of the root cause. All solutions offered were quite speculative. I'm planning to take it to a Sprinter specialist to see if they can offer anything.

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Unread 04-30-2015, 11:10 AM   #14
Red_liner740
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Replace the crank position sensor.

In a diesel, there are very few things that will make it not run. Even if one cylinder was not firing you'd still run and idle without stalling. A low fuel line pressure would have given you a different CEL light.
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Unread 04-30-2015, 04:11 PM   #15
fishinbama
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I agree, replace crank sensor. I can't imagine anyone starting anywhere else. Keep the GDE tune. You might also check to see if your battery is weak or is leaking acid onto your pcm. Another thing to check is your shift bezel.
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