STUCK INJECTOR?????? HELP - Ford Powerstroke Diesel Forum
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post #1 of 30 Old 07-14-2009, 12:03 PM Thread Starter
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STUCK INJECTOR?????? HELP

I posted in the 911 section earlier about what was going on with my truck.

Well heres the new list of problems.
White smoke when you rev the crap out of it
Low RPM stumbling and stuttering
No power and rough idle

I just purchased the truck and it had a slight miss/stumble.So I changed the the fuel filter,which looked as if its been 100k since it was changed.Then I changed the oil which looked very much the same, it was nasty.

After changing fuel filter it ran a little better. After the oil change it was a whole different truck for the first 5 min of the drive, it had power and idled smooth then slowly got worse.

I hooked the scanner up to it and it showed no codes , we did the injector buzz test and everything is fine.

Whats the problem???? My next step is to empty the fuel tank and put fresh fuel in it and some Diesel clean stuff??????


Please help.
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post #2 of 30 Old 07-14-2009, 12:06 PM
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change oil again, run contribution test. 7.3 or 6.0?


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post #3 of 30 Old 07-14-2009, 12:07 PM
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sounds like low fuel pressure.

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post #4 of 30 Old 07-14-2009, 12:16 PM Thread Starter
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We did the contribution test also,sorry I forgot to mention that. It came back fine. We found nothing with the scanner everything came back good.

You think changing the oil again would help. I mean it was pretty bad and immediatly afterwords it ran great.

Where is the fitting to check the fuel pressure on these things

OH yeah its a 7.3
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post #5 of 30 Old 07-14-2009, 12:29 PM Thread Starter
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I keep reading that you should do buzz and contribution test when engine is cold. How important is this? when we did mine it had been running for about 30 min so it was warm.
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post #6 of 30 Old 07-14-2009, 12:43 PM
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contrib balance should be done hot. Buzz should be done cold and hot to listen for difference in sound. Injectors should have a strong response. If any sound weaker than others, you have injector issues.

There is not a port to test fuel pressure on the SD. You can make one that will adapt to the drain fitting or do a volume test that will tell you if the pump is strong or weak.

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post #7 of 30 Old 07-14-2009, 01:06 PM Thread Starter
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The buzz test sounded about all the same. How do I do a volume test for the fuel system?

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post #8 of 30 Old 07-14-2009, 01:18 PM
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post #9 of 30 Old 07-14-2009, 02:31 PM Thread Starter
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I put the diesel clean stuff in it and went for a 40 mile blast down the highway and the truck is running pretty smooth. I think that it might be clearing up. Im going to run the rest of the fuel through it,about a 1/2 tank, and the change the oil again.

What do ya guys think??????

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post #10 of 30 Old 07-14-2009, 03:20 PM
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I think you need to check the fuel pressure...

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