Another running rough on cold startup - Ford Powerstroke Diesel Forum
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Old 04-17-2014, 02:20 PM
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Another running rough on cold startup

This is my symptoms:

On cold start ups engine runs rough. Idling in the yard she runs ok but when I get out on the road she runs really rough. If I get on here she smooths out ( but still runs rough a bit) but normal driving at between 1200 -2000 rpm she runs so rough it shakes the whole truck. Feels like its on the passenger side but its hard to know for sure.It will do this until she gets up to operating temp & then it goes away. The more she warms up the better she runs. Once up to temp she will run perfectly. The colder it is outside the worse it is & the longer it takes for it to go away. No surprise there I guess.

I have recently replaced all glow plugs, IPR, did the 50 cent mod on the passenger side( haven't had time to the drivers), replaced CPS( Grey one), changed the oil( running 15-40 Rotella) & cleaned air filter.

Stating the obvious it must be an injector issue. From what I have read it acts like stiction. I have read that this is more common with the 6.0 but the 7.3 can do it as well. That's what my money is on so far.

So my questions are:

1. How do I determine what's the cause?
2. If it is an injector issue how I determine which one or ones?
3. If it is stiction short of replacing injectors is there anything that can be done? I have read that are some products ( rev X) that may work. Is there any products that anyone has used that worked??
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