What causes the romps?
Postmaster
Joined: Dec 2008
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re
I'd say it's caused by the speed of the software's feedback loop. Under normal oil viscosity conditions, the software is slow enough to just regulate the pressure, but when the oil is thicker, the software is too fast for the conditions, and the pressures undershoot, and the loop isn't stable and out of control.
Pop
Pop
I'm wonder if they made software changes to the pcm in later years. Maybe a poll would be in order to find out what years are commonly affected.
Postmaster
Joined: Dec 2008
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re
That could be....My only thought what would be the difference between syn. and dino in that case? There is a check valve in there. I can see the lighter oil flowing better.
Hotshot
Joined: Jan 2002
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From: La La Land
Might make an interesting specific survey.
Pop
Postmaster
Joined: Dec 2008
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re
Maybe you could do the survey; I don't even know how.........
Postmaster
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re
They would probably put a greenhouse carbon tax on it.
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Hotshot
Joined: Jan 2002
Posts: 17,988
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From: La La Land
Pop
Posting Guru
Joined: Mar 2007
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From: East Peoria, IL
Although I do agree with Dan with software being an issue, I am willing to bet its oil related.
Lets think about this. The system is using high pressure oil, from the engine lube pump, to fire the injector. What happens when that oil is thick and cold? Will it fire correctly? I think not.
Therefore, sythetic oil woudl not be a bandaid as much as a fix to the problem of thick dino oil.
Lets think about this. The system is using high pressure oil, from the engine lube pump, to fire the injector. What happens when that oil is thick and cold? Will it fire correctly? I think not.
Therefore, sythetic oil woudl not be a bandaid as much as a fix to the problem of thick dino oil.
Cargo Master
Joined: Oct 2008
Posts: 3,330
Likes: 13
From: Eaton, CO
Why does my truck not experience the romps in the low twenties and the OP is experiencing the romps in the low fifties? We're both running 15W40 dino oil. Doesn't sound like an oil issue, sounds like an electrical/mechanical issue. Maybe thinner oil masks the electrical/mechanical issue, IDK.
Postmaster
Joined: Dec 2008
Posts: 3,340
Likes: 2
re
Although I do agree with Dan with software being an issue, I am willing to bet its oil related.
Lets think about this. The system is using high pressure oil, from the engine lube pump, to fire the injector. What happens when that oil is thick and cold? Will it fire correctly? I think not.
Therefore, sythetic oil woudl not be a bandaid as much as a fix to the problem of thick dino oil.
Lets think about this. The system is using high pressure oil, from the engine lube pump, to fire the injector. What happens when that oil is thick and cold? Will it fire correctly? I think not.
Therefore, sythetic oil woudl not be a bandaid as much as a fix to the problem of thick dino oil.
What you are saying makes total sense to me. Just seems to me that a lot of the newer vehicles don't have this problem. When I told my Dad about the "romps" ; he acted like I had two heads! (He has a 2002 7.3 with 200k)
Postmaster
Joined: Dec 2008
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re
Try rotella 5/40 syn. and you can run it all year long.