I bought my 03 Lightning with 7800 miles in Dec 05. It has always had a ticking noise like a diesel and a vibration I thought was a tire balance problem.

After two trips from Ohio to FLorida and back, a new set of tires and alignment, the vibration continued and has gotten worse. So bad that in gear and at idle, heat shields are beginning to vibrate.
At a stop light I have to put the truck in Neutral out of embarrasment.

The vibration starts at 40-45 mph, vibrates like a motor mount is loose, until I get to 85 mph before it smooths out.

I now have 38000 mi on the truck and it has no performance problem at all and also no modifications - it is completely stock.

My local Ford dealer could not detect the problem. I had it put on a dyno at a local HP perfromance shop specializing in Fords and they said the engine was ready to go anytime.

Any suggestions? Is it doomed? Anyone know of similiar problems with 5.4l engines?

Any help is appreciated.

 

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