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Glow plug light staying on too long, hard start.
Hey guys. Got a customer truck with a hard start condition. The glow plug light comes on, and stays on for about 10 mins until the truck has reached operating temp...something I've never seen in a 6.0 before.
I know the Beru glow plugs never fail, and even if one did, I don't think it would cause the extended wait to start light illumination...so I've kind of ruled out a glow plug failing.
So of course the next step would be to look at the Glow Plug Control Module, again, something I've never had to replace, but is what I'm leaning to as the culprit of this issue, what do you guys think?
I leaning on the GPCM on the assumption that the glow plug system is contained to the GPCM only, and not other sensors. Basically what I'm asking is: could it be maybe just a faulty ambient air temp sensor causing the glow plugs to stay on for too long? But then again, this wouldn't cause a hard start...
Either way, let me know what you guys think, haven't run into this one before!