Glow Plug Issue

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Nov 10, 2011 | 10:13 AM

BuddyB

Thread Starter

Mountain Pass

Joined: Jan 2003

Posts: 140

Likes: 0

From: Tucson US

Glow Plug Issue

Started about a month ago. Get the CEL, check the codes and its the #6 glow plug. Just been clearing the code so I don't have the CEL light staring back at me going down the road.

I've researched some on the forum and I understand that it could be the GP, the harness, or the module. However,

I don't get the code everytime I start the truck. Truck can be cold or warm, doesn't matter. Another clue is when I start the truck and don't wait for the glow plug light to go out I don't immediately get the CEL but it will sometimes (but not always) light up after a few seconds.

Any ideas to reduce the options of the failing part.

Thanks

Buddy

Nov 10, 2011 | 10:21 AM

bpounds

Hotshot

Joined: Aug 2006

Posts: 17,399

Likes: 318

From: Whittier, CA

You want to check resistance through the suspect GP to find whether it is bad. If the GP checks good, then probably it is the module. There has been a couple of recent threads on how to test the GP.

Regarding the code and CEL, I found that if I cleared the CEL, the code didn't come back on the first hot engine start, then the code came back on a cold start without CEL, and the third start set the CEL.

In other words, it took more than one restart for the CEL to come back.