Join Date: Feb 2007
Location: Broomfield, CO
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Runs REALLY rough when cold, great when warm. Glow plug issue?
It's been quite a while since I've come to visit over here, mostly because my truck has been running really good. I have a small problem now though. Here are the symptoms.
The first time I start the truck each day, it runs REALLY rough for about 5-10 minutes depending on how cold it is outside. The last few days, it's been 30-40 degrees (F) overnight. If I just let it sit there idling for a while, the problem smooths right out and I don't have an issue again until the next morning. If I try to drive it right away, the truck vibrates and I have no power. I'm pretty sure that's because it's not firing on all 8 cylinders. So my question is, what could be causing this? I thought about just replacing all 8 glow plugs, because logically that seems like it would fix the issue. I just don't wanna spend the money and have it not fix the problem, and have to troubleshoot some more. I'd rather just get this done right the first time.
I haven't tried to pull codes (no scanner at home), but none of the dash lights come on while it's idling. The truck starts up without any issues, even though it runs rough. And like I said, once it's warmed up a little bit, it runs perfectly, really smooth with lots of power.
I have a 2006 F-350 6.0L with no modifications.
I have just over 100,000 miles on it (yes, JUST out of warranty)
I maintain it religiously.
Any help would really be appreciated.
2006 F-350 FX-4 Lariat