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post #1 of 9 (permalink) Old 06-26-2008, 05:00 AM Thread Starter
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Help with a problem

Getting ready to leave on a camping trip tommorrow pulling my 38' 5th wheel. Late today it began running rough. It has a very choppy idle and gets worse when I accelerate and is noticable the entire time I drive it. There seems to be no loss of power. I have no check engine lights. I put it on a scanner and there are no codes. I did an injector buzz test and cylinder contribution tests and they were all good. ICP at idle is 530psi, IPR duty cycle is 9% at idle. I had just replaced my gray cps with a black one so for the heck of it I switched them back, but it still is running very rough. I checked all the wiring harness I could find.. My fuel psi is holding steady at 62. I just fueled it up today and put in a Standyne fuel additive. I have ran out of ideas.. Any help?

2002 Ford F350 Crewcab 4X4 SRW, Twin turbos
820 HP on 05/19/12

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post #2 of 9 (permalink) Old 06-26-2008, 05:15 AM
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Re: Help with a problem

bad fuel?

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post #3 of 9 (permalink) Old 06-26-2008, 05:58 AM
 
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Re: Help with a problem

maybe bad fuel, or maybe sucking air in somewhere?
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post #4 of 9 (permalink) Old 06-26-2008, 06:00 AM
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Re: Help with a problem

What's the IPR voltage doing? What is the ICP doing at cruising speeds? Try unplugging the ICP sensor and see if there is any change. Also, check your oil temp sensor wiring.
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post #5 of 9 (permalink) Old 06-26-2008, 08:24 PM Thread Starter
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Re: Help with a problem

After some extensive diagnosing today, I finally found the problem. #5 injector had a broken armature screw and so the truck was missing causing a rough idle.. I got it fixed and put back together and she's running great again!

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820 HP on 05/19/12

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post #6 of 9 (permalink) Old 06-26-2008, 08:29 PM
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Re: Help with a problem

Quote:
Originally Posted by Deputydog View Post
After some extensive diagnosing today, I finally found the problem. #5 injector had a broken armature screw and so the truck was missing causing a rough idle.. I got it fixed and put back together and she's running great again!
good catch...

but just a note...

LISTEN to the injectors during a buzz test...don't just stare at the scantool to tell you "yep they are plugged in"... with a broken poppet screw, you would have definitely heard the difference.

take care~

Dave
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post #7 of 9 (permalink) Old 06-26-2008, 08:52 PM
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Re: Help with a problem

no kiddin...


why does it allways have to be the littlest thing... lol
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post #8 of 9 (permalink) Old 06-26-2008, 09:26 PM Thread Starter
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Re: Help with a problem

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Originally Posted by golfer View Post
good catch...

but just a note...

LISTEN to the injectors during a buzz test...don't just stare at the scantool to tell you "yep they are plugged in"... with a broken poppet screw, you would have definitely heard the difference.

take care~

Dave
Thanks Dave! Actually how I found it was I could hear one on the passenger side bank was sounding different when I buzzed them but still couldn't tell which one. I pulled them all and flowed them and found #5 was bad. After I took it apart it was quite apparent what the problem was. She's running good again!

2002 Ford F350 Crewcab 4X4 SRW, Twin turbos
820 HP on 05/19/12

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post #9 of 9 (permalink) Old 06-26-2008, 09:39 PM
 
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Re: Help with a problem

Good deal, glad it is running good.
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