2002 f250
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2002 f250
I have a 2002 f250 super duty 4x4 with 5.4l.It stalling as soon as I put it in gear, idles fine just stalls in gear. Engine light came on so I took it in to get the code, and it said output speed sensor was bad so I changed it. No change,still stalls in gear. Started looking up other causes. I cleaned the MAS, cleaned the throttle body, replaced air filter and changed the Idle Air Control Valve. After all that the truck still doing the same thing, idles fine but stalls when put in gear. Any ideas
Hotshot
Joined: Jan 2004
Posts: 19,760
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From: St Louis
Transmission fluid or its level cannot cause this issue.
It's one of two things: Either the torque converter clutch is stuck in the ON condition (for whatever reason) or there is a fault that is preventing the engine from properly adjusting to the changing load on the engine. For the latter, a stuck IAC i vlave is one cause (you already replaced it) or there might be a massive vacuum leak.
FWIW, there is no such thing as a code that says "output speed sensor was bad" or the like. It would be best to post the actual Pxxxx fault code instead of an incorrect interpretation of a DTC.
It's one of two things: Either the torque converter clutch is stuck in the ON condition (for whatever reason) or there is a fault that is preventing the engine from properly adjusting to the changing load on the engine. For the latter, a stuck IAC i vlave is one cause (you already replaced it) or there might be a massive vacuum leak.
FWIW, there is no such thing as a code that says "output speed sensor was bad" or the like. It would be best to post the actual Pxxxx fault code instead of an incorrect interpretation of a DTC.
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ok, I will check for vacuum leaks and try cleaning throttle body better. thanks
Transmission fluid or its level cannot cause this issue.
It's one of two things: Either the torque converter clutch is stuck in the ON condition (for whatever reason) or their is a fault that is preventing the engine from properly adjusting to the changing load on the engine. For the latter, a stuck IAC i vlave is one cause (you already replaced it) or there might be a massive vacuum leak.
FWIW, there is no such thing as a code that says "output speed sensor was bad" or the like. It would be best to post the actual Pxxxx fault code instead of an incorrect interpretation of a DTC.
It's one of two things: Either the torque converter clutch is stuck in the ON condition (for whatever reason) or their is a fault that is preventing the engine from properly adjusting to the changing load on the engine. For the latter, a stuck IAC i vlave is one cause (you already replaced it) or there might be a massive vacuum leak.
FWIW, there is no such thing as a code that says "output speed sensor was bad" or the like. It would be best to post the actual Pxxxx fault code instead of an incorrect interpretation of a DTC.
Lead Driver
Joined: May 2003
Posts: 9,303
Likes: 48
From: Lyndonville, Vermont
So can you use the throttle to keep it running? If not then its not the IAC...Does it shut right down like locking up or does it stall slowly. Could be trans/converter for sure.
How about if you move the lever to neutral quick.
How about if you move the lever to neutral quick.
Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
I've repaired several trucks with this exact issue. The problem was low transmission fluid.
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FTE Leadership Emeritus
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From: Stephensville WI
It is a newer truck, but mine occasionally stalled when I put it in gear or shifted from drive to reverse. The symptom vanished when I replaced my failing alternator.
Voltage anomalies can do strange things.
Voltage anomalies can do strange things.
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Hotshot
Joined: Jan 2004
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From: St Louis
That's interesting! Can you explain the "how" and "why" of that? I hadn't run into the situation where stalling was the result of low fluid.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,714
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From: SE Florida
With low fluid the pump can suck air, resulting in low line pressure. When the main regulator valve can't maintain line pressure it will cut all pressure to the converter clutch feed. With no pressure coming into the converter the converter clutch will drift on with enough capacity to partially lock the torque converter, stalling the engine.
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transmission fluid level is good, cleaned throttle body again but better. It doesn't shut down right away it stalls slowly. It idles fine and yes I can put it in neutral and keep it running with throttle.
5th Wheeling
Joined: Jan 2019
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I had a similar issue using my 2003 F250 V10 to pull some tree stumps. It worked fine on the first stump (small tree stumps), but then started to stall and die. I was able to restart the engine, but it seemed to stall every time I attempted to pull another stump. After the engine died for the third time the engine light remained on so I ran a scanner, Speed Sensor Error appeared.
I had just recently purchased the truck, and planned on changing the plugs, filters, etc. The first thing I did was check the spark plugs, I don't know if they had ever been replaced? The truck does have 180k so I figured they should have been replaced at least once, but checking the crusty plugs, the electrode was nearly gone and the gap on nearly every plug was 80 mm plus, I found it hard to believe the engine ran, but it seemed to run fine, although I noticed it would not always start up right away.
Once the spark plugs were replaced, I resumed pulling the stumps and engine worked fine and no further codes. The Speed Sensor has not been replaced.
I had just recently purchased the truck, and planned on changing the plugs, filters, etc. The first thing I did was check the spark plugs, I don't know if they had ever been replaced? The truck does have 180k so I figured they should have been replaced at least once, but checking the crusty plugs, the electrode was nearly gone and the gap on nearly every plug was 80 mm plus, I found it hard to believe the engine ran, but it seemed to run fine, although I noticed it would not always start up right away.
Once the spark plugs were replaced, I resumed pulling the stumps and engine worked fine and no further codes. The Speed Sensor has not been replaced.
Lead Driver
Joined: May 2003
Posts: 9,303
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From: Lyndonville, Vermont
Can you keep it running in drive?
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