[updated:LAST EDITED ON 09-Sep-02 AT 02:09 PM (EST)]Hey all,

Not sure if this is a problem or not, and I'm more curious than anything. If my truck is running, doesn't matter if it's warm or cold, and I leave it in neutral I can slowly press the accelerator and bring the truck to 1000ish RPMs and it will vibrate a good bit. You can actually feel it on the gear shift (6 Spd Man) and the truck vibrates as well. It's not a huge vibration, but it is noticable. Along with this, if I'm sitting at a stop and I take off like a bat out of hell, the truck vibrates like crazy in first gear, but is very smooth through the rest of the gears. Anybody have any ideas what these vibrations might be? Are they a concern or am I just being paranoid. The truck is a 2002 F-250, SC, 4x4, PSD, 6 Spd Man with 26000 miles.

Thanks,
basstardo

 

How's your fuel filter? Have you changed it recently?

 

It was changed once at 15000. It's gettin to be time to change it again. How would the fuel filter have an effect on it out of curiosity? I think I'll run up to Napa after work and get one and change it out tonight...

Thanks,
basstardo

 

Just more of a thought I guess. I just have had weird things happen to me with a dirty fuel filter, ie. restrictions, fuel flow velocity changes, etc. Sometimes......many times engine performance can be related to fuel and air...the two basic elements to combustion.....just my thoughts.

 

Has it done this since new or is it a recent thing?

 

Joe I'm not real sure to be honest. I was sitting in a parking lot about two weeks ago, and I was playin with the pedal and I found that it was doing it. It may have been doing it since I've owned it, but I never played with it before so I can't say for sure. Is it a bad thing?

basstardo

 

It sounds to me like the balance is off a tad on the crankshaft. If it is not really annoying, I'd ignore it. It seems unlikely to me that Ford would agree to do anything about it anyway under warranty unless it is shaking your fillings out of your teeth. I don't think it will hurt anything. You'll never run your engine for any sustained period of time in that RPM range anyway.

 

My 96 has been doing the same shimmy at +/- 1000 RPM's since it was new. It's got 130K now and doesn't seem to mind the shakes a little at that speed.

 

I am considering buying a 99 w/143,000 ... it has this very problem... bad vibration at 1000rpms...is this an expensive fix? Something is else is wrong besides fuel filter problem...any ideas?
thanks

 

Balancing a crankshaft is not really an exact science. You balance it so that you get the least amount of primary and secondary imbalance in the RPM range that the engine is going to spend most of its time in. If you eliminate the imbalance at 1000 RPM, it is likily to show up at some other RPM range. Since the engine is never going to run for any sustained amount of time at 1000 RPM anyway (and it is an expensive fix, requiring the removal of the crank shaft) the logical thing to do is ignore it. Or, you could buy a Harley Davidson so you'd have something to compare it (the vibration) to. (That is humor, for those who don't recognize it.)

 

Do you know what causes this condition? infrequent oil changes? driving low on oil? It sounds like this vibration will affect the longevity of the motor?

 

The crankshaft could be a little out of balance (I'm not saying that is an absolute fact but it COULD be the problem) and if so, it was manufactured that way.

 

could be a bad injector