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Faulty fuel injector?
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=86101		 Page 1 of 1
Author:  Jferg [ Mon Feb 06, 2017 9:20 pm ]
Post subject:  Faulty fuel injector?
Hello Everyone,

I had bought my Liberty CRD back in September and have put about 5000 trouble free miles on it and was really starting the enjoy this vehicle. Then the other day as I was driving down the highway it started running very rough, I lost power, the check engine light came on, and white smoke with a strong diesel smell was pouring out of the exhaust. I pulled over and shut it down. After letting it sit for 10-15 minutes, I restarted it and same thing, very rough sounding and white smoke out the exhaust. I shut it back down and had it towed to the local diesel shop that has done most of the work on this jeep for the PO and the "cylinder #2 misfire" code came up. The mechanic thinks that it is a fuel injector that is stuck open, pouring fuel into the cylinder. After researching this forum, the symptoms seem to point to this as well. However, several posts point out that fuel injector failure is rare for these vehicles so I wanted to get some opinions on what else it might be before spending a lot of money on new injectors.

Secondly, if it is a faulty injector that is stuck open, would this have caused harm to the cylinder or any other internal parts?

Thirdly, can I replace just the one injector or would I need to replace all four?

Thanks guys for all of your help. This site is really amazing.
Author:  racertracer [ Mon Feb 06, 2017 9:57 pm ]
Post subject:  Re: Faulty fuel injector?
Well, you will need to pull the injector and inspect it. It's easy to do especially since the engine code points to Cylinder number 2, that location is the easiest one to access.

Remove the nut and the claw foot that is holding the injector in place and the fuel line. Then begin to twist the injector left to right while pulling upward.

Inspect the injector and If it has not been trashed by blunt force impact, then I would send it out to get inspected and cleaned or replaced. I'd send them all out for inspection at this point.
Author:  joe_ [ Mon Feb 06, 2017 10:23 pm ]
Post subject:  Re: Faulty fuel injector?
Also number them 1 - 4 before you remove them so you know which one goes where. They're supposed to go back in the same place they came from because they all flow fuel a bit differently and the PCM is programmed to account for those differences.
Author:  Jay ne Ohio [ Mon Feb 06, 2017 11:19 pm ]
Post subject:  Re: Faulty fuel injector?
One way to diagnose is to swap injectors and see if the problem follows the injector.

When I bought my red CRD, it was running very poorly. Scanner said cyl 4 misfire. I swapped injectors and it still showed cyl 4 misfire. Turned out to be a couple bad rockers.
Author:  olypopper [ Mon Feb 06, 2017 11:42 pm ]
Post subject:  Re: Faulty fuel injector?
Jferg wrote:
Hello Everyone,

I had bought my Liberty CRD back in September and have put about 5000 trouble free miles on it and was really starting the enjoy this vehicle. Then the other day as I was driving down the highway it started running very rough, I lost power, the check engine light came on, and white smoke with a strong diesel smell was pouring out of the exhaust. I pulled over and shut it down. After letting it sit for 10-15 minutes, I restarted it and same thing, very rough sounding and white smoke out the exhaust. I shut it back down and had it towed to the local diesel shop that has done most of the work on this jeep for the PO and the "cylinder #2 misfire" code came up. The mechanic thinks that it is a fuel injector that is stuck open, pouring fuel into the cylinder. After researching this forum, the symptoms seem to point to this as well. However, several posts point out that fuel injector failure is rare for these vehicles so I wanted to get some opinions on what else it might be before spending a lot of money on new injectors.

Secondly, if it is a faulty injector that is stuck open, would this have caused harm to the cylinder or any other internal parts?

Thirdly, can I replace just the one injector or would I need to replace all four?

Thanks guys for all of your help. This site is really amazing.


Don't let anyone start changing expensive parts like injectors until you do basics like a compression test.
Author:  Jferg [ Tue Feb 07, 2017 12:59 am ]
Post subject:  Re: Faulty fuel injector?
Thanks for the replies. I had planned on pulling the injector and doing a compression test as the next step. If nothing is obviously wrong, I will try to swap injectors to see if problem follows it. The timing belt and rockers were replaced just a few years ago so I'm hoping that isn't it.
Author:  GordnadoCRD [ Tue Feb 07, 2017 4:29 am ]
Post subject:  Re: Faulty fuel injector?
Jferg wrote:
Hello Everyone,

I had bought my Liberty CRD back in September and have put about 5000 trouble free miles on it and was really starting the enjoy this vehicle. Then the other day as I was driving down the highway it started running very rough, I lost power, the check engine light came on, and white smoke with a strong diesel smell was pouring out of the exhaust. I pulled over and shut it down. After letting it sit for 10-15 minutes, I restarted it and same thing, very rough sounding and white smoke out the exhaust. I shut it back down and had it towed to the local diesel shop that has done most of the work on this jeep for the PO and the "cylinder #2 misfire" code came up. The mechanic thinks that it is a fuel injector that is stuck open, pouring fuel into the cylinder. After researching this forum, the symptoms seem to point to this as well. However, several posts point out that fuel injector failure is rare for these vehicles so I wanted to get some opinions on what else it might be before spending a lot of money on new injectors.

Secondly, if it is a faulty injector that is stuck open, would this have caused harm to the cylinder or any other internal parts?

Thirdly, can I replace just the one injector or would I need to replace all four?

Thanks guys for all of your help. This site is really amazing.


It sounds as if you are on the right track with your trouble shooting. It's good to know the possibilities but don't let them distract you from systematically troubleshooting and following what you find, rather than what might be.

Your second question: No, a stuck injector will not harm any other internal components, but when you pull the injector be aware of whether any exterior physical damage has happened to the injector tip, as this would indicate other internal components have failed or been damaged as well.

Your third question: Yes, one injector may be replaced or rebuilt. However if rebuilding / repairing will solve the issue with this injector, you should consider having all four done so they can continue to function as a set.

<edited for spelling errors>
Author:  WWDiesel [ Tue Feb 07, 2017 10:10 am ]
Post subject:  Re: Faulty fuel injector?
Just as others have advised, remove questionable injector and look for any physical damage to tip, if none is found, all four (4) injectors need to be pulled and taken to a fuel injector shop for inspection, rebuild, or replacement as needed.
VERY IMPORTANT! Mark each injector cylinder location by scribing ID marks on them as they are matched to each cylinder from the factory. Marking them by any method that is not permanent i.e paint pen etc... may get removed by the injector shop as another poster on here found out when he sent his out for rebuild and his ID markings were washed off!!! :roll:

IF physical damage is found on injector tip; time to pull head for further diagnosis and inspection... :(
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