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Old 08-31-2013, 03:41 AM
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Test glow plugs at harness?

I'm chasing down a cold start issue and was thinking that, assuming the harnesses are good, you should be able to test the plugs individually from the GPCM side of the harness to the block. Thoughts?
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Old 08-31-2013, 01:13 PM
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yes you can. I find it easier to resistance test the plugs where the glow plug harness connects into the main engine harness. Good glow plug resistance is low, 1-2 ohms typically

BUT if you're not throwing any glow plug DTCs then you probably are not going to find anything by testing resistance. You would need to test the draw of a bank of glowplugs with an inductive ammeter to really know anything.

I will say that usually cold start problems are due to a failing FICM or sludged up injectors.
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Old 08-31-2013, 07:34 PM
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Thanks; I needed an excuse to upgrade my DVM anyway.

As a little background, I've got a recent ficmrepair unit, solid hpo, and good batteries. I'd been tracking hpo and FICM voltage during cold cranking but noticed for the first time this morning that cranking speed was ~110 rpm during several failed attempts. My starter went out this afternoon (although in a different failure mode), so it'll be interesting to see how it behaves now. The new starter is already much more quiet...
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Old 09-01-2013, 05:52 AM
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yeah good cranking speed varies but is definitely more than that. I've seen some trucks with all conditions right have cranking speed near 200 RPM.
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