Leaky injectors? - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 03-26-2008, 08:56 PM Thread Starter
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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?

2003 F350 Crew Cab 4X4
TS Performance 6 pos with Wildman tunes, 3 Pillar, EGT, Boost, Trans gauges, 5 inch turbo back straight pipe, Banks wheel, & Turbo Master wastegate, 2 inch lift
Soon to install Zoodad and Amsoil dual bypass filter.
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post #2 of 3 Old 03-29-2008, 07:06 AM
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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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post #3 of 3 Old 03-29-2008, 07:20 AM
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power service diesel kleen for sure. i love it!

january 2003 6.0 F-350 Lariat 4x4 cc with 08 long bed. recon cab and mirror lenses, torqueshift(reman on 9-03-09) with three disc billet convertor(500 rpm lowered stall speed),mag-hytec deep tranny pan,, 8" fabtech lift w/ 37" iroc super swampers on helos,pro comp ladder bars, custom sct x3 with tunes by eric @ innovative diesel, boost and pyro,edge insight, afe, 4" straight piped, ARP headstuds, banks intercooler & high ram intake. engine mods & maintenance by first coast diesel performance.
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