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Old 01-23-2008, 10:09 PM
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Engine Runs Rough when Cold

Ok so it starts cold no problem. But it runs real rough when it is cold.

Even if it has been plugged in before starting. It still runs rough when the engine temp is cold. Now I have not done any trouble shooting of my own yet. I scanned for codes, I did check the outside connection of the UVC. I got no codes and the connections are fine. I talked to a couple friends and they suggested Injector O-rings. So what are your thoughts on this. I thought it maybe an injector but it after it gets to normal operating temp. It runs fine. So does it sound like injector O-rings, or could it be something else.
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Old 01-24-2008, 09:32 AM
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bump this up for some other ideas.
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Old 01-24-2008, 09:38 AM
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my brothers truck would run rough when it was cold and he had a bad injector..
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Old 01-24-2008, 09:50 AM
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injectors are sticking cold scott, have to pinpoint which ones , cylinder contribution test
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Old 01-24-2008, 10:30 AM
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Could it possibly be injector oil pressure issue when cold?
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Old 01-24-2008, 10:33 AM
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Quote:
Originally Posted by dirk0 View Post
Could it possibly be injector oil pressure issue when cold?
not very likely
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Old 01-24-2008, 10:45 AM
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Quote:
Originally Posted by SCUFFY828 View Post
injectors are sticking cold scott, have to pinpoint which ones , cylinder contribution test
So it is not the o-rings. I will get that done as soon as I can.
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Old 01-24-2008, 11:09 AM
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Originally Posted by bigcountrysg View Post
So it is not the o-rings. I will get that done as soon as I can.
it very well may need o-rings but thats not gona fix your problem
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Old 01-24-2008, 01:20 PM
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I figure if it needs O-rings it would smoke like it is burning oil. But that is not the case. I also am not loosing any oil. I will get the contribution test done next week and go from there. As well as an oil change, when I have the oil change I will go from 15w40 to 10w30. Because of the winter temps I think that may have something to do with it.
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Old 01-24-2008, 07:41 PM
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Thumbs up Big Country

I was having the start issue and I went with Rotella 5w40 synt and starts and runs good as it warms up. It made a BIG difference. Before it would run rough at 40 above and now things are good at 5 above. I don't like to start it when it's that cold without plugging it in. Just wanted to test it to make sure it would if I had to have it. I think it will run the same below the zero.I will go back to the 15w40 when the weather warms up as it gets kinda warm here in the summer. Hope this helps and there is a lot of good info on here about the lighter oil.
99 Red Stroker
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