One cylinder doesn't fire on cold start. Glow plug? - Ford Powerstroke Diesel Forum
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Old 11-30-2012, 05:34 AM
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One cylinder doesn't fire on cold start. Glow plug?

Purchased the truck in summer, and as winter started to set in, when it got colder, it sounds like one of the cylinders does not fire right away on start up.

My only other experience with a diesel, winter, and glow plug failure was my 1981 VW Rabbit. Loved that thing, but it's not quite the same as the 6.0.

Wondering if someone can point me in a direction. I've done some searching and reading, and read everything from GP harness, to relay, to "meh" it's nothing really.

I'm thinking it sounds like a glow plug is not living up to standards, but I'm looking for some opinions and advice on how to identify and test.
I've scanned and there are no codes.
After about 5 to 10 seconds it clears up and runs like a champ.

Thanks all.
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Old 11-30-2012, 05:46 AM
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u can test them Glow plugs... - Ford Truck Enthusiasts Forums

they may not throw a code .. I am still unsure if once a deisel starts even if a GP was down that it would cause an issue ,, seems like that cylinder spinning 1000rpms would heat the air fast enough to cause combustion just like it was designed to do ?

in other words the cylinders with the working GP's were responsible for firing the motor but after that it's a non issue IMHO
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Old 11-30-2012, 05:56 AM
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Glow plugs will not cause a misfire, they assist cold start to improve initial combustion, usually only necessary in very cold conditions. Do you have a monitor, any codes?

Sent from my phone that somebody didn't help me get.
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Old 11-30-2012, 08:30 AM
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Quote:
Originally Posted by southend View Post
Glow plugs will not cause a misfire, they assist cold start to improve initial combustion, usually only necessary in very cold conditions. Do you have a monitor, any codes?

Sent from my phone that somebody didn't help me get.
Well that's the only real symptom. When warm, if stored inside or during the summer, fires right up on all cylinders.
When it's cold outside and it's been sitting, then on startup it fires right up after the usual 3 ~ 5 seconds of cranking, but one cylinder makes some rumbling/clacking sounds for the first 5 ~ 10 seconds of firing, then smooths out.

I was thinking one glow plug not pulling it's weight to get the fuel up to temp for combustion.

?

Oh, and 2 monitors (SCT and Edge Insight), as well as 2 OBD 2 readers.
No codes.
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Old 11-30-2012, 08:34 AM
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Ok, the only other thing that comes to mind is a weak injector or stiction. What oil are you running? Re-x may help you.

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