Glow plug issue
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Glow plug issue
Ok so I am having this crazy issue. Initially, I had glow plugs 1,2,3,5,7 all throwing codes. I ordered new harnesses and plugs and called it a day. After I installed the plugs and harnesses the truck ran and started great in the cold weather. Flash forward two months later and my truck will barely start in the cold. I plugged my computer in and I got 1,2,3 and 5 all throwing codes. I replaced the GPCM and then 1 and 5 codes went away. I plugged the old GCPM back in and the codes for 1 and 5 came back. I plugged the new one back in and 1 and 5 went away. SO I ruled out that the GPCM was possibly frying out the new plugs? I did the ohm test and glow plugs 2 and 3 will not show any resistance at all. What is the issue here? The wires are all snug, there is no chafing, and they're new plugs. Did the GPCM fry out 2 and 3?
More Turbo
Joined: Feb 2005
Posts: 574
Likes: 3
From: Grand Rapids,MI
do you have anything to look at the FICM voltage , plug your block heater in and you truck will probably start fine , but I bet you need a new FICM and a set of batteries ,I went the extra mile and got a alternator and cable kit to boot price will shock you $2200 . But all my problems went away and truck runs great oh also got the 40 Atlas installed , blue elm 327 and torque pro for you phone and you'll be amazed what you can monitor
Fleet Mechanic
Joined: Nov 2006
Posts: 1,664
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From: Northwest
You could just pull everything off the truck and set it up on the bench and fire it up there... Possible you have a bad connection in one of the plug in's in the harness.... If a couple of plugs go bad, that puts all the amps on the remaining plugs. Could have over heated them. Are the glow plugs bulged ?
Hobo
Hobo
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do you have anything to look at the FICM voltage , plug your block heater in and you truck will probably start fine , but I bet you need a new FICM and a set of batteries ,I went the extra mile and got a alternator and cable kit to boot price will shock you $2200 . But all my problems went away and truck runs great oh also got the 40 Atlas installed , blue elm 327 and torque pro for you phone and you'll be amazed what you can monitor
batteries read 12.5 volts when not running in the 25-40 degree weather of NJ. FICM has never dropped below 47.5volts even when cranking. I ordered a new ficm and am waiting for it to come in the mail but I am 99% sure that this is not a power issue.
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glowplugs are Ford motor craft. GPCM is dorman.
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You could just pull everything off the truck and set it up on the bench and fire it up there... Possible you have a bad connection in one of the plug in's in the harness.... If a couple of plugs go bad, that puts all the amps on the remaining plugs. Could have over heated them. Are the glow plugs bulged ?
Hobo
Hobo
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I will do this and report back!
Hotshot
Joined: Dec 2014
Posts: 17,824
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From: Jersey Shore
You could just pull everything off the truck and set it up on the bench and fire it up there... Possible you have a bad connection in one of the plug in's in the harness.... If a couple of plugs go bad, that puts all the amps on the remaining plugs. Could have over heated them. Are the glow plugs bulged ?
Hobo
Hobo
OK, but still where did you get them?
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