Engine Vibration
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Senior User
Joined: May 2009
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From: Colorado Springs Colorado
Engine Vibration
Need a little insight. The truck starts ok, runs good, and accelarates fine. The only thing I have going on is some major vibration and humming noises at idle. I though maybe it was the power steering pump, but I can't see how that would make the whole engine vibrate. This vibration clears up as soon as you give it a little pedal, or flip on the high idle, and this all started about two weeks ago. I've tried searching for some info, but everything I found doesn't really seem to fit. Oil was changed back in November. Fuel filters have about 4000 on them.
Post Fiend
Joined: Oct 2005
Posts: 10,626
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From: Plano TX and Brentwood TN
Need a little insight. The truck starts ok, runs good, and accelarates fine. The only thing I have going on is some major vibration and humming noises at idle. I though maybe it was the power steering pump, but I can't see how that would make the whole engine vibrate. This vibration clears up as soon as you give it a little pedal, or flip on the high idle, and this all started about two weeks ago. I've tried searching for some info, but everything I found doesn't really seem to fit. Oil was changed back in November. Fuel filters have about 4000 on them.
You sure it's not a miss from an injector? I've been in some trucks where an injector going bad caused a miss that made the truck shake at a stoplight.
Also, with regard to fuel filters especially, sometimes things happen and it doesn't matter if there are only 20 miles(or less) on the filters and they could still need replacing. I'm not saying that that is the case here, just that it still could be no matter how short of a time it's been since they were swapped.
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Senior User
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From: Colorado Springs Colorado
Also, with regard to fuel filters especially, sometimes things happen and it doesn't matter if there are only 20 miles(or less) on the filters and they could still need replacing. I'm not saying that that is the case here, just that it still could be no matter how short of a time it's been since they were swapped.
The only thing I can read codes with at this point is my Insight, and it reports no codes. How bad of an imbalance before a code is thrown? Also could a sticky injector cause such issues?
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Senior User
Joined: May 2009
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From: Colorado Springs Colorado
Took the truck in for service, and they found a very small miss on two injectors. They also found that the fuel pump is only putting out 40-42 PSI, and what to start with replacing the HFCM, and wire harness, do the upgraded fuel pressure regulator, and new filters. How much can low fuel pressue affect injector timming? This is gettign exspensive rather quick, and I'm not to happey about it. Don't ya just love the holidays.
Post Fiend
Joined: Oct 2005
Posts: 10,626
Likes: 7
From: Plano TX and Brentwood TN
Took the truck in for service, and they found a very small miss on two injectors. They also found that the fuel pump is only putting out 40-42 PSI, and what to start with replacing the HFCM, and wire harness, do the upgraded fuel pressure regulator, and new filters. How much can low fuel pressue affect injector timming? This is gettign exspensive rather quick, and I'm not to happey about it. Don't ya just love the holidays.
Hotshot
Joined: Dec 2003
Posts: 15,369
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From: Stuttgart, Ar
These fuel injectors HAVE to have high fuel pressure. The minimum fuel pressure should be 45psi at WOT. I'd have the fuel pressure regulator respringed before having the pump replaced. It's possible there is absolutely nothing wrong with the pump and it's not that hard to change anyway.
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Post Fiend
Joined: Oct 2009
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From: N. Fort Worth, tx
check the oil level of the engine. seen were the person doing the oil change had forgot to drain the old oil first. you get 30 qts of oil and a pretty good vibration form it.
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Thread Starter
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Senior User
Joined: May 2009
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From: Colorado Springs Colorado
In the famous words of Homer Simpson DOH! I don't really think that would be the case here though. Checked the oil level and all is good. Going to pick up the truck soon... We'll see how she runs.
We do a lot of fleet work
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Senior User
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From: Colorado Springs Colorado
Cheezit, have you ever seen a turbo cause engine vibration, but still seem to provide plenty of boost as well as minimal turbo lag? I had the turbo off in early October, and the spindle spun freely, and I could detect not movement either radialy or axially. Not sure if that could be another part of the equation.
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Senior User
Joined: May 2009
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From: Colorado Springs Colorado
Not sure waht you mean by neutral run up, but it does vibrate at idle. That is the only time I feel any vibration in the engine, seems most noticeable on top of the turbo. By the way for anyone interested my fuel PSI is now up to 77 from 42.
Hotshot
Joined: Dec 2003
Posts: 15,369
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From: Stuttgart, Ar
Haven't seen this suggested.....possibly an exhaust pipe isue?