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Go Back   Ford Powerstroke Diesel Forum > Ford Powerstroke 99-03 7.3L Forums > 99-03 7.3L General Discussion
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Old 03-26-2008, 09:56 PM
fredbear fredbear is offline
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Join Date: Dec 2007
Posts: 21
Leaky injectors?

I've noticed a 4 MPG drop in mileage over the last year. I had the dealership run a buzz test and a contribution test. They said everything is fine. Will these tests detect leaky cups? The PCM was also reflashed a year ago. Anyone ever seen a 4 MPG decrease from a dealer reflash?
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Old 03-29-2008, 08:06 AM
wesjones wesjones is offline
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Join Date: Sep 2005
Posts: 388
Have you been putting in straight ULSD for the past year? Alot of the seals for like the fuel filter, and i think the injectors were designed to expand from a reaction with the sulfur in the fuel, making a perfect seal......thats the problem with ULSD, not enough sulfer content to make the seals work perfectly.

If you have no codes i would suggest a fuel lubricant like K-100 or Powerservice.

Sorry for the late post...
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Old 03-29-2008, 08:20 AM
nsrchofpwr nsrchofpwr is offline
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Join Date: Aug 2006
Location: jacksonville, florida
Posts: 1,608
power service diesel kleen for sure. i love it!
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