i want to remove glow plugs and controller
- Thread starter downunder
- Start date
Ansd yes you will get a check engine light once you remove them. You can use EFILIVE to disable the codes so you don't get the check engine light.
I deleted my GPCM and the truck started and ran, but like others before me I ended up putting the controller back in (2007 LBZ). I did delete the glow plugs.
Quote:
Originally Posted by jneal
Last year when I deleted my glow plugs I also deleted the glow plug controller. It will run without it, but for reasons that I can't remember I put the controller back on, the little I do remember was I could never get a good log with the controller deleted.
probably because it contains the 120ohm terminator for the HS GMLAN bus...
Quote:
Originally Posted by jneal
Last year when I deleted my glow plugs I also deleted the glow plug controller. It will run without it, but for reasons that I can't remember I put the controller back on, the little I do remember was I could never get a good log with the controller deleted.
probably because it contains the 120ohm terminator for the HS GMLAN bus...
We have the Chevelle running without any of the above fine. At first there were a few codes that caused hard starts, crazy idle, and no throttle. but once they were deleted all is good.
I deleted my glow plugs when I did my injectors. removed power wires, the control box and left the glow plugs in place.
Brian how did you get it to run without the control box? When I pulled mine after the motor build it would go into reduce power mode until I put the box back in.
I have no clue?? I turned off all the glow plug tests in the tune and never had an issue since lol. the start/run tables are all zero.
Brian how did you get it to run without the control box? When I pulled mine after the motor build it would go into reduce power mode until I put the box back in.
Codes need to be deleted in the tune, and it works fine
Like what was stated earlier the '06 and newer trucks have the GMLAN data circuits running through the glow plug control module. It also houses the terminating resistor in it. Remove that and you get no communication on the high speed data circuits if I remember correctly.
what is the highest temperature the glow plugs activate
and how do they start at 0deg C or (32Deg F)
I have seen the table on EFI live but cant remember what the cut off is
and how do they start at 0deg C or (32Deg F)
I have seen the table on EFI live but cant remember what the cut off is
Brian how did you get it to run without the control box? When I pulled mine after the motor build it would go into reduce power mode until I put the box back in.
Maybe you have a california emissions truck?
The LB7 cali trucks had a more advanced "smart" glow plug system than the federal emissions trucks. Not as smart as the LLY+ system, but it was more than just a couple basic relays like the federal LB7's.
It shouldnt have gone into reduced engine power though. Are you sure the REP problem was directly related to the glow plug module being removed? Ive never heard of that causing those sort of problems, especially on LB7's that have a very "basic" "old-school" glow plug system in comparison to the fully-solid-state/computerized glow plug control of the LLY+ duramax's.
If you remove the gpcm on a canbus system as in gmlan, than the tan and the tan and white hi and lo can circuits needs tied together witha 120 ohm resistor.
When you measure resisance at the dlc it should be 60 ohms as 2 120 ohm resistors in parrelell circuit will be half.
That doesn't mean you won't have ghost nocomm with gpcm codes in systems especially lmm.
When you measure resisance at the dlc it should be 60 ohms as 2 120 ohm resistors in parrelell circuit will be half.
That doesn't mean you won't have ghost nocomm with gpcm codes in systems especially lmm.
04-05 LLY's also have high-speed databus running between the ECM and GPCM too.
Its not "GMLAN", its J1939 high-speed CAN. Very similar, just different protocol. Still a high-speed databus, so the 04-05 LLY glow plug controller is just as "smart" and "integrated" as the 06+ GPCM.
ben