I was thinking injector also but like I said I don't have to much knowledge of Diesel engines. Thanks


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Can these injectors be rebuilt? Rock auto has them for $800 and I think that's a piece but i was in hurry when I looked and I havnt priced them anywhere else.


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I'm pretty sure they can.
Once you get the injectors out, take them to a shop that specializes in diesel injectors and pumps and have them tested. Then ask if they can be rebuilt.

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U.S. Army Retired

The number of CRDs that have had injector failures that I've heard about is very low - like one. These injectors are VERY durable, and are used in lots of other CP3 applications with many thousands more hours on them than any CRD has or most likely will ever have.

I wouldn't waste the money getting them tested unless there is a compelling reason to suggest that they might be bad. The potential for misfueling could certainly be causing some goofy things, but that is where the "IV bottle" test will clear out the fuel pump and you will be running (at least briefly) on known-good-fuel and then see if anything changes.

I got a code off of the liberty today, cylinder 3 misfire. P0303. You rev it up past 2000 rpms and the problem is completely gone so I'm thinking fuel injector at this point, any one have any reason for me to look at something else? Thanks for your time!


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hmm, since the injectors are super reliable, it's probably already been mentioned, but if anyone has been into the system down stream of the filter, then maybe that injector got some debris lodged in it? I'm mostly asking the experts, because I'm not that familiar with this system yet. But, has it always been #3? If not, I'd suspect air. I didn't read this entire post, do you have a lift pump, or have you eliminated all the usual air sucking devices?

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05 CRD: H.D.S2 stat,WW Ironrock trilink&LCA's, OX rear,ARB front, 4.10's, ARB bumper, Suncoast,OME 3.5, JBA UCA,rock rails, Moabs&265/75 Duratracs, GDE tunes ,FFD fan,ARP's, 2 micron fuel, new valves,sasquatch battery tray & grid heater, tensioner relocated
Mech fan, VH & AC delete

And if it is determined to be #3, also might be worth a shot to clean the connector for that injector.

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05 CRD: H.D.S2 stat,WW Ironrock trilink&LCA's, OX rear,ARB front, 4.10's, ARB bumper, Suncoast,OME 3.5, JBA UCA,rock rails, Moabs&265/75 Duratracs, GDE tunes ,FFD fan,ARP's, 2 micron fuel, new valves,sasquatch battery tray & grid heater, tensioner relocated
Mech fan, VH & AC delete

Not positive if it's always been number 3, this was first time to pull codes.


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Someone will probably chime in to let you know if the air sucking can get better with more suction (higher RPMs). Makes sense that the quick connects back at the tank might get sucked "shut" with more suction. If you're feeling froggy, you can drop the tank when empty, and cut out the quick connector on the supply side, and put in marine grade fuel line with steel hose clamps. I think you just need 18" of the line and two hose clamps, but they can also suck air at the fuel filter head and other places.

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05 CRD: H.D.S2 stat,WW Ironrock trilink&LCA's, OX rear,ARB front, 4.10's, ARB bumper, Suncoast,OME 3.5, JBA UCA,rock rails, Moabs&265/75 Duratracs, GDE tunes ,FFD fan,ARP's, 2 micron fuel, new valves,sasquatch battery tray & grid heater, tensioner relocated
Mech fan, VH & AC delete

Ok I'll check it out!


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Well I havnt made it any further with this problem. I found a dealership here in Tulsa that said they would diagnose it for free even if I plan on repairing it myself.


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Ok so the dealer tried a new injector and that wasn't the problem. They called me this morning saying they think it's the pcm that's bad but are not 100%. Told me it would be 1200 plus tax to replace this and if it isn't the issue i would be out the cost of the pcm. Any advice? I'm really hating this jeep at the moment!!


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$1200 is way too much to spend on something that might fix it.
I doubt its the PCM.

So which injector did he swap? Just #3?
Did he do any kind of test or inspection of the other injectors?
Was there any damage to the old injector?
Did he look down the injector hole to see if there was any kind of damage to the top of the piston?
Its entirely possible that the problem is not in cyl #3.

Have the glow plugs been removed and inspected? A piece of broken glow plug bouncing around in the cylinder definitely wont sound right. (this doesn't see likely but its worth a look)

Here is a quick test to perform:
1. start the engine and let it idle
2. pull the wire connector off one injector.
3. The engine should still idle, badly, but listen closely to see if the bad sounds went away.
4. reconnect that injector and try the same thing on the next one. Do each injector one at a time.
5. record your results.
Also, if you pull the plug on one of the injectors and the engine dies, there is most likely a problem with one of the other three injectors.
The engine should be able to run at idle on only three cylinders. It will be rough and the engine wont be happy about it but it can help narrow down the problem.

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U.S. Army Retired

The injector driver circuit can and does fail. The good news is that it's a cheap and readily available part. The bad news is that you need to have good soldering skills and the confidence to work on your ECU. There are repair services that can fix this for you for a fee much less than a new one.

...but first you need a proper diagnosis. Agreed $1200 is way too much for something that the dealer should be able to diagnose properly and with a high degree of confidence.

Ideally you need to find someone that can look at that signal on an oscilloscope to determine if it is present/good.

...in the absence of this the suggestion of disconnecting injectors one by one is a fair starting point.

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does it smoke badly ? if so remove exhaust heat shield ,get laser temperature gun to measure exhaust ports temp , if one of them runs hot , check that injector

also check injectors fuel returne flow , very easy to make home made tool 4 small fuel lines and 4 cups , run engine for 2 min check fuel level in all 4 cups must be almost same

I checked the injectors my self before I took it in by unplugging one at a time and it didn't matter which injector I unplugged the engine would die. When I unplugged the suspected bad injector it died in the same fashion at unplugging all the other injectors one at a time. I'm leaning towards a bad pcm just because it went from running perfect, straight to crap. But I'm not going have my daughter dump 1200+ on something they ain't sure about. I'm kinda pissed that they don't know for sure. I took it to the dealer cause I figured they would be able to diagnose without a doubt, wrong! I like the fact the aint charging me for all the diagnosis but still!


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ok injectors pass performance test , hope pcm will fix your problem ,good luck

Thanks for your input guys! You have been a great help! I did find an article on Oregon diesel about these crd's and one of the sections that popes out to me was a multiple injector misfire code, and TSB that went with it saying the pcm should be reflashed by dealer before anything else is done to see if that's the problem. So I called the dealer and they had no clue about that TSB but we're willing to do a reflash with current software. They are suppose to let me no something today. When I checked the code my self I got a injector 3 misfire when the dealer check it they got a 4 and then a 1 on the second check.


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This may sound dumb, but have they (or you) tried replacing the cam or crank sensors? If the engine doesn't know where it is in the cycle, it might inject at the wrong time and that could cause it to detect the misfire.