Rough idle - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 01-07-2012, 12:39 PM Thread Starter
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Rough idle

I have a '94 F350 5 speed. added a CPR fuel system, Adrenaline HPOP, H2e turbo, Swamps 200/30 injectoers, DP Tuner F6. Tried starting it up the other day and have had nothing but trouble. It idles really rough like its not firing on all 8 cylinders and wont stay running through a cylinder contribution test. and as far as I can tell all the injectors seem to be squirting out the same ammount of oil. Tried unplugging each pair of injectors one at a time and could'nt really notice any difference in the way it idled.
Fuel pressure holds 60 lbs, checked high pressure oil pressure and it's good, has a new high volume LPOP, changed IDMs, new VC gaskets and harnesses under the VC, Plugs on the outside of the VC look good not burnt, changed CPS with the "new and improved blue sensor" and then to another regular sensor, unplugged the chip, changed oil and filter, tried a different ICP sensor, changed IPR nothing is helping
I'm thinking it has to be and injector but don't know how to tell which one it is they are all brand new so I'm out of ideas and patience. Not sure where to go next any suggestions?
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post #2 of 7 Old 01-07-2012, 03:03 PM
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Did you check fuel pressure? Did it run long enough to purge the HPOP? Is your tuner a custom burn to your truck? Just asking the obvious first.

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post #3 of 7 Old 01-07-2012, 03:47 PM Thread Starter
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Yea it holds 60 lbs of fuel pressure. the chip is custom but I unplugged the chip and it didn't make any difference. I drove it about 15 miles and it seems to get worse as the truck warms up
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post #4 of 7 Old 01-07-2012, 04:12 PM
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Have you pulled the valve covers to make sure you didn't accidentally unplug an injector? Did that once changing glow plugs and it took me forever to figure out what happened


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post #5 of 7 Old 01-07-2012, 07:43 PM Thread Starter
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yea checked that and even had it running with the valve covers off to try to see if any injector didn't have as much oil coming out but no luck
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post #6 of 7 Old 01-12-2012, 05:15 AM
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I believe you may be having the same problem as me. Have you checked the pressure in your hpop? Mine is currently at 3800 psi at an idle and the shop is telling me that I have debris in the front cover or hpop resevoir. Just check pressure with a mechanical gauge or you can check it with a scanner. Could also be IPR
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post #7 of 7 Old 01-12-2012, 11:52 AM Thread Starter
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it idles at about 900 psi. I've had the resivor off and cleaned it out good and cleaned the ipr twice and still no change
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