runs rough after 5 min. - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 16 (permalink) Old 01-04-2007, 01:59 AM Thread Starter
 
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Question runs rough after 5 min.

Hello GREAT site.
My name is Frank I have a 2000 7.3 F-250.
I have a Geasecar kit installed on my truck.
The problem that I have is when I am running on diesel fuel the truck runs rough ( idle speed goes from 300-1200) truck has no throttle response.
but seems to run fine at 35 - 85 MPH.
When I switch over to Grease the truck runs fine.
Idle is steady sounds good.
Does it sound like I need to clean the screen in the FPR.
What will I get out of shimming the FPR, other than higher fuel pressure?
How do I do this and where is the FPR located on a 2000 7.3, what does it look like?
I had the CPS changed at 56000 miles and the EBS at 103000 miles GPS at 90000 miles
My truck has 127000 miles on it, 25000 on grease.
Thanks any help would be great, sorry if this is to easy of a question, I would just like to fix something for myself rather then spending BIG MONEY in the garage.
Thanks again Frank
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post #2 of 16 (permalink) Old 01-04-2007, 02:05 AM
 
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I would first check to make sure the fuel filter is not plugged.
Next see if you have any fuell pressure.
I'm almost wondering if it could be a uvc harness, but that doesn't explain the varying idle.
Joe should post on this soon with his opinion.
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post #3 of 16 (permalink) Old 01-04-2007, 03:03 AM Thread Starter
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Thanks, I changed the fuel filter, when I looked in the fuel filter canister, it looked all full of gunk sludge.
Grease does not use fuel filter.
what is the besy way to clean canister? chemical?
Thanks Frank
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post #4 of 16 (permalink) Old 01-05-2007, 02:19 AM Thread Starter
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I cleaned out the fuel canistar, and I cleaned out the FPR screen, it still run like crap at Idle.
I need help.
Frank
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post #5 of 16 (permalink) Old 01-05-2007, 11:34 PM Thread Starter
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I took it in today, the guy thinks it is starving for fuel, he thinks the filter in the fuel tank is plugged.
What do you guys think?
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post #6 of 16 (permalink) Old 01-06-2007, 04:39 AM
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I would try run it on diesel without using your fuel tank to see if that is a possibility, you know just hook up an auxilary and try it, but it may be more trouble than its worth. Just a thought

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post #7 of 16 (permalink) Old 01-09-2007, 04:05 AM Thread Starter
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The guy at the shop said that the fuel lines rusted thru, and it was sucking air.
Any one else have this problem?
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post #8 of 16 (permalink) Old 01-17-2007, 11:28 PM Thread Starter
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The guy at the shop was wrong, turns out that my pcm is junk.
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post #9 of 16 (permalink) Old 01-19-2007, 12:43 AM Thread Starter
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he changed the pcm and it still runs like junk.
Please I need help costing big big money?
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post #10 of 16 (permalink) Old 01-19-2007, 02:28 AM
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So the grease bypasses the fuel filter? Where do the lines tie in...I mean...you have a factory fuel line and your grease supply line. They have to tie in somewhere. Is it possible that where they tie in...some sludge backed up the diesel supply line...partially clogging it? If the truck has no issues with grease, but acts up with diesel...it has to be a fuel problem. How old is the diesel in the tank. If its really old...you may have critters (algea) that has grown in the tank and is plugging the intake portion.

Just throwing out ideas here.
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