Diagnose injectors on a budget - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 04-11-2012, 12:29 PM Thread Starter
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Diagnose injectors on a budget

I have a 2001 F350 that starts extremely rough in the morning and spits white exhaust. I have already replaced the batteries, glow plugs, gpr and the under valve cover wire harnesses which has eaten my budget for this project. I am almost considering selling the truck. When I took the truck to a mechanic I was told that there is substantial blow-by but the shop wanted $500 for a compression test. I would have done the compression test myself but I couldn't find a diesel compression gauge that I could rent.

The truck runs great once it's warmed up and my fuel economy is 14 mpg since January. When I run Diesel Kleen in the fuel the problems seem to get better. This leads me to believe that I have a sticking injector(s).

Am I on the right track? How do I diagnose injectors on a tight budget? I would like to do the labor myself to save money.

Thanks in advance for the advice.
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post #2 of 3 Old 04-13-2012, 06:36 AM
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Hook it to a scanner and get cyl contribution numbers. It wont give you an absolute, but the numbers can help indicate how bad they are getting...

Example - My stocks at 135000 miles were around the following:

1) <1%
2) <1%
3) <5%
4) <2%
5) <2%
6) <3%
7) <2%
8) <8%

After replacing the injectors with used stage 1s and new o-rings:

1) 0%
2) 0%
3) <2%
4) 0%
5) 0%
6) 0%
7) 0%
8) <4%

Nonconformist. Functionality over bling.

My three rules for 7.3l troubleshooting: 1) Replace CPS and keep a spare. 2) Replace FPR and know your fuel pressure. 3) Hook it to a scanner and check for codes.
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post #3 of 3 Old 04-13-2012, 03:10 PM
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I was told to use rev x by a couple of other members but i never tried it, i just replaced my injectors instead

2000 f550 crew cab 4x4 w/ utility bed
regulated return w/ bowl delete, 4" straight pipe, stage 1 single shots, DIY 6637, adrenaline HPOP, DP tuner F6= 80 econo, 140 aggressive, 140 extreme, towing tunes, 22.5's w/ super singles

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