I have a 2005 f250 5.4L with 130k miles on it. The engine keeps randomly shutting off. Seems to happen when foot off is off accelerator. It's been to the shop and they did a bunch of work (I will attach the invoices with the description of work) and it's still shutting off. I had another mechanic come out and look and he couldn't find anything wrong while it was hooked up to live data, however he only hooked it up while the truck was on and sitting. He did say he saw the rpms drop and the truck acted like it was going to shut off, but it didnt. It also seems to happen after it's been driven for a few minutes or even up to over 30 minutes. The mobile mechanic suggested replacing the fuel pump and the crank sensor. Not sure if either of those items would be in line with the symptoms. What's already been done: fuel induction service (top engine), replaced MAF, cleaned throttle body and replaced spark plugs.
What makes this problem better or worse?
After it's driven for a few minutes or could happen up to 30-45 minutes after it's started
How long has your 2005 Ford F-250 Super Duty had this problem?
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Hi - Dave here, contributing to RepairPal and providing expert advice since 2010.
Fuel induction won't do anything for your concern.
Mass Air Flow sensor - only if you had a fuel trim issue verifiable with a diagnostic tool - sounds like a guess.
Cleaned throttle body - won't help your concern.
Replaced spark plugs - always good for preventive maintenance, but generally will not fix this stalling concern. By the way - hope the coil boots were also replaced when you replaced the plugs, or you're most certainly going to have misfires of the engine.
Crankshaft position sensor will NOT help you.
Fuel pump is a guess; if you take the time to perform a fuel pressure test on the vehicle you can verify if your fuel pressure is insufficient, inconsistent or bleeding down - which would indicate a problem. Other than that, it's a total guess and not worth the money.
What you need is a skilled technician with a diagnostic tool and patience - to verify your concern while testing the vehicle hands on. This isn't terribly complicated, honestly. When the problem occurs, you'll be losing spark, fuel or having an issue with not enough or too much air getting into the engine. Are there any diagnostic trouble codes set? Any warning lights illuminated?
Truly, this is not a complex engine or operating system. Seek guidance from a professional and experienced technician. See below for some shops near you. Good luck!
https://repairpal.com/auto-repair-near-me
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