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Just finished my head stud job...went pretty smoothly ....replaced alll 8 glow plugs and both harnesses....truck fired up and is throwing a code for all 8 glow plugs...they felt like the all snapped in when I put them in...could I be missing a ground somewhere what might I have missed....other then this truck soounds awesome which I couldn't be happier about
 

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Loose connector? Who needs glowplugs.? :D

Sent from my phone that somebody didn't help me get.
 

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You did clear the codes before retesting with a scantool right.????
 

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the connectors break and the glow plug module breaks causing the connector to not lock in. sometimes wires will pull out from the back of the connector too or dirt gets in the rubber seal. They are a pain, I avoid unplugging the gpcm at all costs.
 
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