Why you shouldn't drive around with injector codes!

[southend]

Haven't driven my truck but a few times in months, just very short distances. Shortly after I got my early 04 6.0 CC KR swb 4x4 FX4, I started to notice a very slight stumble down the interstate, hardly noticeable. Not long after, my truck started to shudder at around 55-65 mph. I could get on it and it would get up and go, then start to stumble again. This now included rough idle. No unusual smoke, started fine.
Pulled P0270 - #4 injector circuit low and P0272 - #4 injector balance/contribution
I ohm tested both sets of pins #1-2 @ 51.69 ohm and #3-4 @ 0.7 ohm. I knew then that one of the coils was bad. Fast forward to today......

Pulled it out today and found the coil screw nut backed off and the screw was hanging loose. I found the nut. I'll try to post pics, apparently I can't do that from my phone.



Sent from my SCH-I500

[Deere Diesel Man]

Please post when you can. Thanks

[southend]

Here is the pictures.

[Tuscany]

you know i have been having the same problem with mine since i bought it almost 2 years ago. For the life of me I couldn't figure out what the problem was. I know when I bought the truck we took it to the dealership about this problem and they said it had blown hg's and bad oil cooler and was throwing contribution codes for the injectors but i haven't been able to get codes to pop up for the injectors. I still have a feeling that some are on their way out but time will tell when I rip it apart for the hg's.

[southend]

Yea, I posted this so it might help other guys having similar problems. Ohm testing the injectors is fairly easy and can tell you alot.

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[Tuscany]

do you have to pull them to ohm test them? if so that will have to wait til i rip into it to do the hg's lol. I have had the top end of this motor ripped apart 3 times already and now its going to be a forth lol I dont want to do it again.

[southend]

Originally Posted by Tuscany

do you have to pull them to ohm test them? if so that will have to wait til i rip into it to do the hg's lol. I have had the top end of this motor ripped apart 3 times already and now its going to be a forth lol I dont want to do it again.

No, you just disconnect the injector. The hardest part is making sure you get on the pins correctly. They are small. It should be .4-.6 ohm at ambient temp. The corresponding pin #'s are printed on the plug. #1-2 and #3-4. At least with this check you can know if it is an electrical failure vs mechanical.

Edit: the new injector ohmed out at .8 for both coils at ambient temp.

Sent from my SCH-I500

[Tuscany]

Good deal, that said if its electrical is it repairable or would I still have to replace them?

[southend]

Originally Posted by Tuscany

Good deal, that said if its electrical is it repairable or would I still have to replace them?

Replace them as far as I know, those coils are finicky.

Sent from my SCH-I500

[Tuscany]

lol well that said before i rip mine apart for the hg's i'll get my buddy to bring the dealership computer scanner home and run injector tests to tell me which ones are bad or are going then get some new ones to stick in their places.