Have an '07 5.9 that was running perfectly and the next morning threw a P2146 code and is now running like crap. I ohm'd the harness and the injectors, all were well within spec with the 2nd injector being I believe .3 (others were .1). I ended up replacing the valve cover gasket (harness) and same issue.

Do I just assume it's number 2 injector, even though .3 shouldn't be an issue. All other wiring looks good, tried disconnecting the batteries a few times, batteries fully charged, etc. The truck is a garage queen and is spotless.

Thanks for any help

 

Using an IR Thermometer like

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, check the temps at each cylinder's exhaust port and you will probably see #2 much lower than the others. If so, it's probably time to pull the injector. There are several options.

1. Pull #2 and replace it, or
2. Pull all 6, send them out for testing and rebuild,
3. Replace all 6.

On my '03, I had one go bad and sent them all out. Several were borderline. I had them all rebuilt by F1. Engine ran great afterwards.
Back to morning brew . . .

 

I'll try that - It's got 98,000 on the clock and I've had a 2 micron filter on since 60,xxx - Always run extra fuel lubricant. If money were no object, I'd throw six new sticks on but I'd rather not at the moment.

 

Let us know how it goes, and good luck.

 

I did temp them and #2 was slightly cooler after running a minute or so.

I also than hooked up a better code reader. I had just pulled the first code with my Edge Monitor. When I hooked up the code reader I was able to get a code (can't recall what) for cylinder #2.

I ordered a new injector solenoid and installed it and it fired right up. Wasn't a bad install and I'm going to order an extra to keep in the tool box, just in case.

 

Great Info, thanks for posting.