E350 van 6.0 Sudden Loss of Power - Ford Powerstroke Diesel Forum
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Old 02-22-2014, 09:16 AM

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E350 van 6.0 Sudden Loss of Power

I’ll post this under both motor and trannie problems, since I don’t know which it is…here is the situation:

Background: 2005 E350 Super Duty Van 6.0, about 80,000 miles, bought a few months ago, basically problem free, but I don’t know previous history. I know the motor has been worked on, but I don’t know the extent. Recently, in the NJ cold this winter, and due to only starting weekends, the batteries drained. Last weekend I had to lower both batteries and recharge them one at a time. I did make sure one was always connected to the vans pos. and neg., and maintained ground.

The Problem: Today, slightly warmer out, I started the van problem free, drove the van about 10 miles problem free, stopped in a fast food drive thru, while waiting in line, I noticed the motor seemed to be suddenly running rough, got out food, took off and immediately I noticed lack of power. From dead stop, almost flooring the pedal, the motor barely, slowly spins up, the van barely takes off, but slowly, builds up speed, the trans eventually shifts, but I cannot achieve RPM fast enough or high enough (3k max under any condition) to go. I nursed the van home and here I am. BTW, I do have a scan gauge. When this happened I monitored boost, about 1.1-.13 at idle, under heavy acceleration while the motor is barely spinning up and the van barely moving (but throttle floored) BST about 3.6-3.8, suddenly would jump up to 7-8. This problem started suddenly and unexpectedly. The van “had” plenty of power, FICM, Alt, ECT and EOT, then in line at fast food something changed and now no power, hard to achieve RPM, hard to say if van speed/trans in line with engine RPM due to lack of power. BTW, Trans fluid full and clean.

Any suggestions what to monitor with scan gauge, or where to start other than having it towed to FORD? Thanks in advance for what is always helpful and knowledgeable advice. GP
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