Leaky injectors?

fredbear · #1 (**permalink**) 03-26-2008, 08:56 PM

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?

wesjones · #2 (**permalink**) 03-29-2008, 07:06 AM

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...

**nsrchofpwr** · #3 (**permalink**) 03-29-2008, 07:20 AM

power service diesel kleen for sure. i love it!

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