Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Other than injectors, is there any reason that a 01' Duramax 6.6 LB7, would be putting out more than 40cc of fuel, during the 15 second crank test, from the small fuel line?
Oil level is perfect.
Yes, being measured from the return, at the rear of the driver side head.
I should add that prior to changing the injectors the fuel measurement was 130+ cc, per 15 sec crank. Now it is 80cc, per 15 sec crank.
I'd also like to add that the ECM has been swapped out, with a security disabled ECM, with no change to the crank- no start issue.
Actual is 38-51/52 MPa
Desired is 42 MPa
We did a test the rail pressure with the FRP plugged in, as well as unplugged, there was no change. The scanner that is being used is a Modis.
No codes at all, at this point. Original code on the truck was the FICM (U1800)
None running upon arrival. Owner stated she was driving down the road and it just died, hasn't started since. She said as far as she knows, there was no hard start or any type of miss/white smoke, prior to it shutting down. She has owned the truck for 8 years, claims this is the 1st problem she has ever had. Has done regular maintenance, as far as oil changes go, but has only done 2 fuel filter changes. We put a new AC-Delco filter on it, replacing the napa filter she was running.
No sir. The code was cleared and didn't return, upon changing the FICM.
To my knowledge the scanner is communicating with the FICM. Could you give some detail as to what type of communication you are looking for?
No sir. It was a used FICM (came off a running truck) & I don't know that we've ever had to program one. Going out a limb here and guessing that only a dealership can do that?
Okay. I will make some calls and see what I can get done. In the mean time, I have ordered the FRP sensor, just to be on the safe side. It will be here later this afternoon. I will let you know what I find out next.
Bad news. Per the VIN & build date(01/01) this FICM does not have to be programmed to the truck. Back to square 1. =(
Thank you!! 😆
Hi Cam! Amanda. Yes sir, 8 brand spankin new Injectors. They are direct from Bosch.
I'd also like to add that we just replaced the black fuel line, with clear line, from the CP3 to the metal return line, on the driver side, which appears to have constant bubbles & squirted a lot of fuel.
Yes sir. Hold please.
Main return line, from the back, has no fuel coming out of it.
Correct. However there is a ton of fuel coming from the CP3 line
Changed the pump, crank no start. Changed the FRP sensor, crank no start. Any more ideas?
It has a Duramaximizer, which we unhooked.
Just wanted to give an update on this vehicle. Replaced the FRPV, still will not start. Truck has now been transferred to a different shop. Thanks for your help, even though we were unable to determine the issue.
Will do!! We know the people that own the shop that it is now going to(We were the 2nd shop to work on this truck) so I'll be sure to ask them what they find out with it!! Thanks again!!