Help confirm glow plug issue
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Elder User
Joined: May 2007
Posts: 506
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Help confirm glow plug issue
Hey everyone,
I've had an engine light on for a week or so now. I need some help to just confirm my logic and see if I'm headed in the right direction. If you don't mind, read my case and let me know your thoughts.
FYI... 2002 California 7.3L
1. Check engine code came up for cylinder 5.
2. Looked procedures for checking glow plugs with multimeter... Found out my multimeter is broken. Nuts! Proceeded to change out glow plug #5. I made extra sure that my connections were good upon reassembly.
3. Cleared codes after replacing #5. Still had a #5 glow plug code...
4. Went and bought a new multimeter. Disconnected my valve cover gasket harness and tested the four pins leading to glow plugs.
Results: everything tested out at about .8-1.2 ohm except #5 (approx 8ohm).
Voltage test: all connections from the harness were approx. 11.5v
My conclusion:
I either have a bad valve cover gasket or wiring harness leading to glow plug #5?
I guess I'll need to tear the cover back off and test the internals?
Thoughts, questions, comments?
Thanks for everyone's input.
I've had an engine light on for a week or so now. I need some help to just confirm my logic and see if I'm headed in the right direction. If you don't mind, read my case and let me know your thoughts.
FYI... 2002 California 7.3L
1. Check engine code came up for cylinder 5.
2. Looked procedures for checking glow plugs with multimeter... Found out my multimeter is broken. Nuts! Proceeded to change out glow plug #5. I made extra sure that my connections were good upon reassembly.
3. Cleared codes after replacing #5. Still had a #5 glow plug code...
4. Went and bought a new multimeter. Disconnected my valve cover gasket harness and tested the four pins leading to glow plugs.
Results: everything tested out at about .8-1.2 ohm except #5 (approx 8ohm).
Voltage test: all connections from the harness were approx. 11.5v
My conclusion:
I either have a bad valve cover gasket or wiring harness leading to glow plug #5?
I guess I'll need to tear the cover back off and test the internals?
Thoughts, questions, comments?
Thanks for everyone's input.
Laughing Gas
Joined: Nov 2010
Posts: 1,193
Likes: 2
From: D.C. but heart's in TEXAS
Yeah, it sounds like you could have a bad harness, or even valve cover gasket (check the pins both inside and outside of the VC to see if any are burned looking). A new wiring harness from an International dealer will run about $30-35. I think the VC gaskets are more like $65 (it's been awhile).
I doubt this is your issue, but since you're looking at this area and state you have a CA truck...if you have a Glow Plug Control Module, check both of the wiring plugs and the inside of the GPCM as well. They are notorious for going bad. The new plug adapters with wires runs about $130 online, and you have to cut and solder the new plugs on to your original wiring harness. A new GPCM runs about $120 online...and it is the same GPCM as what the 6.0's use.
I doubt this is your issue, but since you're looking at this area and state you have a CA truck...if you have a Glow Plug Control Module, check both of the wiring plugs and the inside of the GPCM as well. They are notorious for going bad. The new plug adapters with wires runs about $130 online, and you have to cut and solder the new plugs on to your original wiring harness. A new GPCM runs about $120 online...and it is the same GPCM as what the 6.0's use.
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