glow plug help
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Senior User
Joined: Dec 2005
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glow plug help
Truck has been hard to start on cold mornings, with some white smoke on start up. First thing I did was change the factory batteries out, then I changed out the factory GPR to the Stancor one suggested on this site. I was still having hard starting issues. I then borrowed a multimeter from my electrician buddy. I disconnected the plug on the driver-side valve cover. I then conducted a OHMs test on the glow-plug pins. All of them on the driver-side read 0.0. This leads me to believe that the harness under the valve cover is shot or disconnected some how.. Is this correct? On the passenger-side valve cover, I disconnected the plug and conducted a OHMs test on the glow-plug pins. They all read between .8 and 1.1. so this leads me to believe that the passenger-side glow plugs and harness are fine. Is this correct?
Hotshot
Joined: Jul 2003
Posts: 12,177
Likes: 40
From: Newport, WA
Sounds like a good assessment to me. But remember, the injectors are also on the same harness, so if your truck is running okay then the harness is probably fine. The wires going to the glow plugs have been known to rub through before, but having all 4 on one side go sounds out of the ordinary. Time to pull the valve covers and see what is going on.
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
If you are going to take the VC's off, I would go ahead and change the GPs at the same time. I did that when I changed my injectors, they all tested good, but I wanted to change them at the time.
Don't forget to torque down the injector hold down bolts, and the rocker bolts.
Don't forget to torque down the injector hold down bolts, and the rocker bolts.
Hotshot
Joined: Jul 2003
Posts: 12,177
Likes: 40
From: Newport, WA
Valve covers aren't too bad to pull, there is just a lot of stuff in the way on the pass. side. You need several extensions in varying lengths and a wobble joint to git 'r dun. Gasket is re-usable, torque spec for the VC bolts is goodentight. For the injectors the spec is 120 in/lbs (10ft/lbs) and the rocker arm pedestal bolts get 20ft/lbs.
Lead Driver
Joined: Jan 2007
Posts: 6,708
Likes: 5
From: Kiowa CO
Yes, the v/c's are pretty easy to remove. Depending on the side you are working on, you need to clear away all the stuff that crosses over the top of the v/c. On the driver's side, this means removing the air intake hose, and disconnecting the main wire harness that is attached to the bracket. Then it's just getting to the v/c bolts. You need a variety of extensions and a wobble socket to get to the ones in the back. Yes, the gasket is re-useable.
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Hotshot
Joined: Jul 2003
Posts: 12,177
Likes: 40
From: Newport, WA
Almost forgot- unscrew the oil fill tube on the passenger side to make the valve cover easier to remove.
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Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
Thats a good tip. When Chris grabbed mine and started twisting on it, I was like
. But it came right off. I also had the MASTER right there when I did the quarter mod.EDIT: When Chris grabbed my oil filler tube.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
They call it the 50c mod because it is one quarter per side.
And your really do want to go into the driver's side, take care of business in there, then you know it's done and no worries.
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