2004 F550 6.0 diesel 220k miles intermittent no start, highway buck/jerk/black smoke - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 06-25-2012, 08:19 AM Thread Starter
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2004 F550 6.0 diesel 220k miles intermittent no start, highway buck/jerk/black smoke

so far Ive replaced; injectors 1,3,4,7, HPOP and solenoid, fuel pump and new regulator kit, HPO sensor, EP sensor, EGR cooler and oil cooler

buck/jerk/black smoke on highway goes away when BARO sensor is unplugged. replaced. no change.

intermittent no start( hot, cold, warm-- no bias). starts when exhaust pressure sensor is unplugged or with a shot of ether. installed relay to "unplug" EP sensor only when cranking--this worked great for 2 days and now i have same intermittent no start and overboost(35 psi on hiway) this blew a charge air hose. highway Buck/jerk/black smoke goes away completely when brand new BARO sensor is unplugged. im about to change my VGT actuator. anybody have any idea whats next when this doesn't work?

Last edited by dfarryessir; 06-25-2012 at 08:21 AM. Reason: forgot BARO sensor
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post #2 of 8 Old 06-25-2012, 08:50 AM
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What are the codes? Has it been scanned?

04 F550
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post #3 of 8 Old 06-25-2012, 08:55 AM Thread Starter
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only codes were open EGR valve (probably caused by me unplugging it) and havnt had codes ran since overboost issue.
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post #4 of 8 Old 06-25-2012, 11:25 AM
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My bet is FICM. Can you have the voltage checked?

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post #5 of 8 Old 06-25-2012, 11:32 AM
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in all your doings did you clean out the tube when you replaced the ebp sensor.


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post #6 of 8 Old 06-25-2012, 07:41 PM
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Quote:
Originally Posted by lawman349 View Post
My bet is FICM. Can you have the voltage checked?
I second that! I was going through the same thing and it turned out to be my FICM . . . . . . . . . . . . . . .

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post #7 of 8 Old 06-26-2012, 04:53 PM Thread Starter
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Looks like the VGT actuator was the culprit. No more intermittent no starts, no over boost. Will post what happens when I find baro sensor and plug it back in-- think it may run more efficiently wit it. Thanks
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post #8 of 8 Old 06-27-2012, 11:33 AM Thread Starter
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The truck definitely has more power with Baro sensor plugged in and still no buck jerk or black smoke. However, intermittent no start has returned (with or without baro sensor). I suspected voltage drop
To ficm during cranking-- so I cleaned terminals and checked--10.2 volts when cranking. Ebp tube is clean. Just a tiny shot of ether is all it takes to get it going. Any other ideas?
Thanks

Last edited by dfarryessir; 06-27-2012 at 11:34 AM. Reason: Baro
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