Hey guys, so I've got 2003 lb7 with about 126k on it. was putting out a little white smoke so had it tested. Said I had 2 bad injectors. Replaced full set and now it's knocking hard and blowing a lot of smoke. I've heard the engine harness can be an issue. Any direction would be great!
pretty much lost
- Thread starter morris.aaron87
- Start date
Its all white smoke. Haven't had the rates checked yet. The guy didn't clean the lines from what I know. I paid a guy that works on my dad's semis to install them. Fired it up and he thought it was electrical.
Who's injectors were they? O.E. Bosch or a set of eBay specials? If he wasn't surgical clean when installing them you may have some pinned open. Doesn't take much grit at all to stick a brand new tight injector.
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They honestly were eBay specials. Trying to pay for a wedding so I went cheap. But there's more than one not firing. Pours white smoke when I start it. Then lopes when I come off the throttle. Not sure if it's bad injectors or a connector. Had good pressure to the rail. 5200
They were'nt from Pensacola Fuel Injection where they??? I had injectors done on my truck and thats something I did'nt want to cheap on, too much of a job for one injector to mess up.. Too much money too..
Probably bad shotty injectors. Sorry bud, return them and get oem Bosch remans
You shouldn't try to save money when it comes to the fuel system on a common rail diesel
You shouldn't try to save money when it comes to the fuel system on a common rail diesel
Yeah, it's my first diesel. For these ones from diesel care out of Tennessee. Guess they'll be headed back. But is there a possibility of it being the wiring harness before I pull these injectors?
Check the balance rates first.
Then command 160Mpa and see if the pump can hold it. 5,200psi (35Mpa) at idle is good. If it was pegged and the truck was loping then somehow your FPR got unhooked. No reason to unhook it for injectors but who knows. Doesn't sound like that is the case.
Run a cylinder cut out test. If you saw one with high balance rates before pay attention to that cylinder. See if the smoke clears up when a specific cylinder is turned off.
If the truck cannot hold rail pressure and/or balance rates seem off you can run a return rate test. More on that later if you have to.
Do you know if he drained the coolant at all before starting? Reason I ask is because an injector cup could have stuck to an injector and filled a cylinder with coolant when removed if the coolant wasnt drained. Then when you go to start it, bad things happen. Bent rod can explain smoke and knocking sound if you ruled out any of the injectors being bad. Compression test would show this.
More than likely its a bad injector either due to poor rebuilding or possibly installation. The high pressure lines need to be checked when replacing the injectors. They tend to corrode and sometimes need to be replaced.
You do not have to spend the money on Bosch remans if you want, GM remans are fine and half the money online. You can get GM remans for $200 from GM wholesalers. Bosch remans are double and not worth it. Plenty of GM remans doing great on here.
Were your injectors no name remans? Reason I ask is because "eBay" doesn't mean much. Maybe someone is on there selling GM remans. If they wont take them back or warranty anything, I would just replace the bad one(s) yourself. If you have other stuff to pay for, no need to waste money in fear of something possibly not happening. They are not very hard to replace with a little time and basic tools.
Awesome information. I'll get some tests run and see what happens. They were no name injectors. Said they used Bosch specs. Apparently not. But lots to learn about these toys.
Did you buy remans or were they refurbished?
I wouldn't touch a set of refurbished with a 10 foot pole.
I wouldn't touch a set of refurbished with a 10 foot pole.
They were remans, so they said. We used an ohms meter to check them and they tested fine. But that doesn't mean much if they're junk.
If he didn't clean the lines then it's the installers fault, not the injectors. As soon as you started the truck with the debris not removed from the high pressure lines you destroyed the new injectors...
So is there any possibility of it being electrical? If not I'm gonna go ahead and put new injectors in and make sure the lines get cleaned for sure!
THIS ^^^^
The injectors failed not the cp3, so why would the lines/rails be contaminated unless the tech threw them in the dirt...
Do what Durallymax advised above... Unless you got money burning a hole in your pocket...
See Quote from earlier...
Replacing parts for no reason is worse than buying cheaper parts and having them fail. Run some diagnostics first and then decide what to do. Odds of it being electrical are slim to none, that doesn't mean replace everything though. Did you see what the companies policy was on the injectors where you got them?
Not necessarily.
Ummm, not sure where to start here? Your very lost...
Not cleaning the high pressure lines is a BIG time no no. Can lead to instant injector failure...
Ummm, not sure where to start here? Your very lost...
Not cleaning the high pressure lines is a BIG time no no. Can lead to instant injector failure...
X2. they could be perfectly clean until you loosen them and let all the crap built up around the fittings fall into the lines. Install the old lines without cleaning them and there's a good chance you will be replacing injectors again.