engine missing on cold start up - Ford Powerstroke Diesel Forum
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Old 02-26-2012, 09:27 PM
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engine missing on cold start up

ok i am out of ideas i have a 2000 f250 7.3 with 293000 miles on

on Saturday i started it up (not being plugged in overnight)
when it started it was running really rough from what i could tell
it was not sending fuel to all cylinders (i am going to call this misfiring) .
i thought that maybe it was because i had low/no fuel in the tank
got it to a gas station filled it up
After i filled it up it was still misfiring pulled to the side and took off
my chip (diablo predator) and it ran fine all the way home
later that night i went to start it and it was doing the same thing

on Sunday (after being plugged in overnight) went to start it it was still misfiring
replaced the fuel filter (It needed it badly) and it started up running fine
ran it around town and it did fine.
went to start it tonight after it cooled down and the misfire was back
i let it run for a little while hoping as it warmed up it would go away
but it did not
turned it off and unhooked the batteries waited 10 minutes
hooked them back up and it started and ran just fine.

When the engine was misfiring the check engine light was on
i tried to use the predator to pull the codes
i got a Exhaust back pressure sensor (i have a banks power elbow)
i have had that code for a while
i cleared the EBPS code
the check engine light was still on ran the codes again and nothing

any ideas would be gratefully appreciated

i think tomorrow monday i am going to try to do a buzz test to make sure its not the injectors

maybe thinking it might be a fuel pump

but at this point i have no idea
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Old 02-27-2012, 04:47 PM
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Can a bad Exhaust Back Pressure Sensor and/or plugged manifold tube cause the pcm to defuel my engine during warm up?
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Old 02-27-2012, 04:54 PM
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It's not defueling, the EBPV is sticking for some reason. Do a search for disconnecting the EBPV plug and try that for a bit, just make sure youdo it while it's warm and working correctly. Tie off the arm after you unplug it.

Also check your back pressure sensor for a clogged tube.
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Old 02-27-2012, 05:11 PM
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I have a banks power elbow which i thought got rid of the EBPV butterfly so i don't think its sticking, but i have never done anything with the EBPS and tube. the trucks in the shop tonight so can't work on it tonight, but i am still wondering if a bad EBPS can cause the engine to defuel
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Old 03-01-2012, 08:41 PM
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so the biggest problem with any forms are most of the trends don't have the solution for their problem.
so for anyone that does a search and comes up with the same problem I had.

here is what i had to do

Problem:
Misfire on startup once engine warmed up it went away
Codes: IDM 1316 & EBPS (Exhaust Backpressure Sensor)
Solution
Started with the EBPS replaced clogged sensor and clogged tube
solved the EBPS code, DID NOT solve the misfire problem
Replaced the under valve cover (uvc) harness "harness connection was not loose
there was a short with in the harness"
Solved the IDM code & the misfire

So far the problems have not come back and i hope this helps out anyone that has the same problem i had.
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