The old rough idle problem
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Elder User
Joined: Nov 2003
Posts: 723
Likes: 1
From: Spring, Texas
The old rough idle problem
I have read ten pages of rough idle threads in the search engine and can't seem to find a remedy. There are lots of suggestions but I can't find where anyone has posted a solution.
Here are my symptoms. Motor runs fine. At a stop light I notice a reverberation thru the truck. The tach does not move. The motor does not die. i just have this vibration. No smoke. No loss of power. It does it in drive, park and neutral. I recently changed the motor oil. It started after that. Today I changed the tranny fluid and screen/filter. No change.
What do you think?
Thanks.
Here are my symptoms. Motor runs fine. At a stop light I notice a reverberation thru the truck. The tach does not move. The motor does not die. i just have this vibration. No smoke. No loss of power. It does it in drive, park and neutral. I recently changed the motor oil. It started after that. Today I changed the tranny fluid and screen/filter. No change.
What do you think?
Thanks.
Senior User
Joined: Mar 2004
Posts: 343
Likes: 0
What type of motor oil did you use? I recently "tonite" had the same thing happen. To nite i changed my oil usung delo 400 le. Big mistake! My truck hates the stuff. So immediately change the oil again using motorcraft 15-40 powerstroke oil. Now all is well. I will never use delo 400 LE again.
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Hmmmm. I have used Rotella religiously since 02 in my truck. In April I changed it to Delo for some Molybdenum or whatever it is called for cleaning in the injectors. I am on my second change of Delo and no real problems to speak of. Dyno and drag strip #s were good there too.
I am not saying that the oil cannot be a problem, I am saying it is OK in my rig.
I am not saying that the oil cannot be a problem, I am saying it is OK in my rig.
Senior User
Joined: Mar 2004
Posts: 343
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Originally Posted by Tenn01PSD350
Hmmmm. I have used Rotella religiously since 02 in my truck. In April I changed it to Delo for some Molybdenum or whatever it is called for cleaning in the injectors. I am on my second change of Delo and no real problems to speak of. Dyno and drag strip #s were good there too.
I am not saying that the oil cannot be a problem, I am saying it is OK in my rig.
I am not saying that the oil cannot be a problem, I am saying it is OK in my rig.
I too have used the delo 400 before without any probs, but that delo 400 LE (low emissions) stuff was no good for my truck.
Lead Driver
Joined: May 2007
Posts: 8,608
Likes: 13
From: Belair md
i have the 400 le in my rig to experiment an dnoticed the imediate drop in performance and mileage, i am going back to the mobil delvac, much better, and in my opinion the delvac is better then the rottela as far as longevity. not saying rotella is bad, i have run both in my truck but i like the delvac better
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Senior User
Joined: Jul 2006
Posts: 226
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From: Brighton, CO
I'm with Mr. Bob - sounds like exhaust to me. Maybe just coincidence about the oil change? Maybe just now noticed it? I know my 5 exhaust does exactly what you are describing. If you idle up a bit, does it go away?
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Thread Starter
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Elder User
Joined: Nov 2003
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From: Spring, Texas
I used Delo 400LE. I have used Delo in the past, not sure if it is LE though. The vibration does go away when I accelerate or click into the high idle mod on my tuner. Which part of the exhaust should I be looking at? I had it installed over a year ago. Think it would be showing up now?
Senior User
Joined: Mar 2004
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Maybe your problem is different, but mine was the Delo 400 LE! Like i said, as soon as i got rid of it, truck ran perfectly! I would hate for you to change your oil (because of me) and it didnt help, but then again, what if it does help...tuff call.
Senior User
Joined: Jul 2006
Posts: 226
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From: Brighton, CO
Originally Posted by haulingboat
Which part of the exhaust should I be looking at? I had it installed over a year ago. Think it would be showing up now?
Maybe one of your hangers moved or loosened?
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