Rev engine up, let off throttle, engine dies
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Laughing Gas
Joined: Apr 2011
Posts: 1,002
Likes: 7
From: London, KY
Rev engine up, let off throttle, engine dies
My truck started doing this last night. While setting in park when I rev up my engine to between 2500 and 3000 rpms and just let off the throttle it dies. It will start right back up and idle just fine. If I ease off the throttle rather than just let off it won't die but I can feel a brief shudder as it falls below 1000 rpms. When I first started it up last night, it didn't want to stay started. I had to hold the key switch in the start position for a few seconds to keep it running. I drove it and it did just fine. But its still dying when I rev it up in park and just let off the throttle quickly.
Tuned
Joined: Apr 2011
Posts: 464
Likes: 5
From: Redmond, WA USA
From recent research I just did on your exact symptoms exhibited by my brother's 7.3, the problem is usually a stuck part inside the injection pump (can't remember what it is called). Sometimes it will free itself (it did for my brother). Others will install a new fuel filter completely filled with a concentrated diesel fuel system cleaner and run that through the engine, with the hope that it unsticks it.
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Laughing Gas
Joined: Apr 2011
Posts: 1,002
Likes: 7
From: London, KY
Changed the fuel filter about 3 weeks ago. Injection pump is new, however, I am running off the rear tank which the previous owner said hadn't been used in a couple of years. Some diesel kleen may do the trick.
Logistics Pro
Joined: Sep 2010
Posts: 4,411
Likes: 4
From: Victor, MT
Sounds like your filter caught a bunch of crap that was in the rear tank, I would suggest a lookasee at that thar filter and some diesel kleen...
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Laughing Gas
Joined: Apr 2011
Posts: 1,002
Likes: 7
From: London, KY
Sounds like a good plan. I don't like that filter anyway. It's the one piece filter instead of the two piece with the water seperator. It came with the truck when I bought it.
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Junior User
Joined: Jul 2010
Posts: 54
Likes: 1
From: Jacksonville Florida
Mine was doing the same thing, I was told to fill a new fuel filter with diesel kleen and start and run for 15-30 seconds then let sit for atleast an hour preferably overnite, then run it hard and after a couple of minutes it should clear up. It worked great on mine, I did also treat the tanks, gave both of them a real good dose to clear help the fuel in there.
Cargo Master
Joined: Dec 2010
Posts: 2,123
Likes: 5
From: Fort Worth, TX
One-piece filter? Does it have the water drain on the bottom? If not, there could be water in the filter with no way out. Not a good thing. I have the one-piece filter but mine has a water drain and sensor port on it.
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