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Old 04-04-2019, 07:51 AM
Matt Matt is offline
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Default Fuel injectors

2011 RAM 3500 6.7L cummins. Customer wants a new set of injectors. I just wanted to do some background research before committing to this job. Do the replacement injectors require software install or any re-calibration procedures that I need to be aware of? I've replaced injectors in earlier cummins without any problems, I just haven't done any 6.7Ls yet. Please advise. Thank you.
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Old 04-04-2019, 08:50 AM
Glide Glide is offline
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You will have to enter the flow numbers that are on the side of the injectors(each injector has a specific number).Snapon scan tools have the capability to do this.

Edit: when I refer to injector number I am talking about the six digit alpha numeric correction code.

Last edited by Glide; 04-04-2019 at 08:58 AM.. Reason: to avoid confusion
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Old 04-04-2019, 03:23 PM
Matt Matt is offline
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Thank you Glide. This is exactly the info I was looking for. I assume I just enter this info before I fire it up for the first time after the injectors are installed? Thanks again.
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Old 04-04-2019, 04:20 PM
Glide Glide is offline
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Yes.Go to ECM then special functions,follow the prompts and enter each six digit code in the position it is installed in,1-6.After you have completed this cycle the ignition off then on.
The truck will run even if you don't enter the correction codes,but it will set fault codes and will not run right.
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Old 04-05-2019, 04:53 PM
Matt Matt is offline
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Thank you.
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Old 04-16-2019, 11:52 AM
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Ok, so ends up this guy is severely budget limited. Only DTC is P0191- fuel rail pressure sensor circuit. Doesn't misfire. Starts great. The only symptom is intermittent heavy smoke at idle and crank case over full with fuel. Is there any diagnostic strategies I can employ to locate the worst injector and replace just one for now. Any live data/PIDs to observe. Very random. I know this usually ends up bad and I need to say all 6 injectors or go somewhere else! Any suggestions, thank you.
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Old 04-17-2019, 03:10 AM
kirkbarrow.garage kirkbarrow.garage is offline
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Only way forward, doing worst one, would be a leakoff test to see worse result and move forward slowly.
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Old Yesterday, 07:18 AM
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Quote:
Originally Posted by kirkbarrow.garage View Post
Only way forward, doing worst one, would be a leakoff test to see worse result and move forward slowly.
Will do.
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Old Yesterday, 09:53 AM
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Quote:
Originally Posted by Matt View Post
Ok, so ends up this guy is severely budget limited. Only DTC is P0191- fuel rail pressure sensor circuit. Doesn't misfire. Starts great. The only symptom is intermittent heavy smoke at idle and crank case over full with fuel. Is there any diagnostic strategies I can employ to locate the worst injector and replace just one for now. Any live data/PIDs to observe. Very random. I know this usually ends up bad and I need to say all 6 injectors or go somewhere else! Any suggestions, thank you.
I have 2 thoughts.

1) Don't let his budget become your problem. If you put a single injector in it you'll probably be blamed when the next one goes. Perform your diagnosis and repair independent of customer funds. In the end, the truck needs what it needs, and it's not your fault.

2) You can do a return flow test on it, but it's not easy on a Cummins, and you'll have to replace all the feed pipes to do it. If he's got no money, he won't want to do this either. If it was me, as soon as he said he didn't have the money to fix it, I'd cut him loose.

Joe
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