Ok, here's the short history:

1- In town driving the engine ran out of power and died (sort of slowly), restarted, died, restarted and came back to life. Next day started idling rough and throwing cyl. 2 contribution/balance code. Seemed a little low on power

2 - the rough running came and went over the next couple days - I drive 4 miles to work, so I continued to drive the truck and monitor the codes. Noticed P0232 fuel pump secondary circuit high - which also came and went but seemed to be more prevalent when idling.

3 - driving to work one morning, lost power and died. sputtered, but wouldn't start. Finally started but ran really rough. had contribution/balance fault codes for cyl 6 and 7. Also had fuel pump secondary circuit high. Finally, got it running - presumably on 7 cylinders and drove home.

3 - Pulled the FICM out and found a few wires that had been shorting on the valve cover/FICM bracket. I repaired the wires and wrapped potential abrasion areas with kevlar sock and e. tape. Looked carefully at #2 injector harness - I saw some abrasion but it didn't look like it got through to the wires, I wrapped it well. After putting everything back together the truck fired up and ran smooth. Drove it about 15 miles - it seemed sluggish off the line (maybe it was just me), but smooth and no codes. Almost home and it started to run rough again. at first had cyl. 1 contribution/balance code - then switched to cyl. 2 contribution/balance code.

4 - I drove it to work one more day (to see if it would settle on one code). At work I read that the fuel pump secondary circuit code can be caused by the ground on the firewall. Cleaned up the ground - no more fuel code, but still ran rough. consistently read cyl 2 contri/balance code.

5 - replaced cyl. 2 injector (with rebuilt injector off of ebay). I took a bunch of photos and plan to post a quick write up if anyone's interested. Put everything back together -she turned over quite a bit before starting (apparently thats normal) and still idled rough. Drove down the road about 1 mile - still cyl 2 contribution/balance fault. still rough idle, rough running and lack of power. ** get up this morning planning on taking the truck to the dealer - and she runs perfect! **

Aaaargh! am I still chasing electrical problems here? do replaced injector take a while to acquaint themselves? FICM? Help before I burn this thing!

 

I've got about the same thang going on not shur if it's electrical are not runs good some times and like crap other going to tare into it this weekend. any pointers would be nice on getting the injector out

 

Just because you put a "new" injector in it doesn't mean the injector is good. I would drive it a bit to see if it throws the code again, but be aware it could still be the same injector bad. Kind of sounds like a spool valve problem to me.

 

Has any body checked the fuel pressure?

 

Excellent question. Nothing like going back to basics when injectors are involved.

 

I have seen 3 times now where 1 of the wires in the plug to the ficm were pulled slightly back in the harness for the injectors. Truck would run fine, and all of a sudden a dead miss, especially at idle. Look very closely at the wires and pins in the ficm as well. Not bent? Wires pushed into the plug as far as possible? When I had this happen, 2 other dealers told the people they needed injectors. They didnt.

 

Thanks for the Help eveyone. Truck ran great yesterday and started missing a little today again...its a very soft miss though -not as rough. Still getting cyl. 2 contribution.

I never did check the fuel pressure. This has got to be electrical...I'll look at the plugs again. I am getting really good at getting the FICM off. I have abou t 3/4 of an injector write up complete...I am finding if very difficult to figure the pics out. Maybe I will write it in word and email to someone who is better at posting it?

Thanks,
Clint