Hey guys, been awhile since I been around.. been terrible busy lately with school.
Well my uncle is having the above problems with his 01 CC dually. I don't have too much information to go on but here is what I know...

166,000 miles

he changed the fuel filter two months ago, was worried because of how much "slime" was in it.

Now all of the sudden it runs rough... he had the codes read and they say #1 and #4 injector need to be replaced. I laughed.

He also said somebody told him to pull those injectors and wire brush them thinking that maybe they are clogged. I don't think this will help at all.. correct me if I am wrong.

I'll look at it for him this weekend, but my best guess right now is uvc harness.
unless the vc gasket/harness/connector itself is bad, i can reuse it right?
I'll probly have a spare on hand just in case anyway though.

He is very limited on cash, so we are trying not to spend much money unless absolutely necessary, which means staying away from diagnostics from a shop.. i.e buzz and contribution tests, unless they arent really that expensive, or someone lives close to Northern Virginia and has one that is willing to help.

let me know what you think...
thanks

 

I have to agree with the guy that looked at your uncle's truck. Most likely the injectors are internally clogged and there is no recourse but to get them rebuilt.

 

Thanks Kwik for the reply. Well I finally got to look at it earlier today. No evidience of wiring problems.
When you floor the truck in neutral I can only get 1800 rpms and plenty of blue smoke

pulled the vc's and started testing injectors one by one pulling the connector off then starting truck up.

the mechanic that my uncle took it too ran contribution test and found 1 and 4 to be the problem.

I found #1 dead but when I disconect #4 and restart- truck barely stays running. so i think that one's ok

on the other side same process and found 6 and 7 to be dead.

Is this a correct process for me to be able to tell which ones are bad? If I unhook 1,6,7 truck runs exaclty the same as when I hook them all back up.

I assume a breakout test does exactly what I am doing only it can keep the truck running correct?

Well any thoughts are appreciated...I wish I hadn't agreed to work on this thing at all now.. but kinda late to change my mind. Thanks
Ryan

 

Yes, replace the ones that make no difference when you unplug them. You are basically doing the same thing by unplugging them as the breakout box would do.
Also, if the owner can afford it, I highly recommend replacing them all. With three out of eight gone already, the other five have to be in bad shape as well.

 

I totally agree, and the o-rings actually look bad on those three, another reason they all need to be pulled... I'll see what I can talk him into.. sad to see such a nice truck not taken care of...
thanks for the help
Ryan