folks I need some help!
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Junior User
Joined: Aug 2009
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folks I need some help!
my '02 250 4x4 5.4L is missing,/bucking when in 4th gear (automatic) when its under a load @1500-1800 rpm range, when I down shift, it clears up. for instance, I was towing my boat last night and around 60mph in 4th gear you could really feel it, put it in tow/haul mode, went to 3rd and ran fine.(2500rpm)
I have changed fuel filter, air filter, cleaned MAF sensor and ran codes, had 2 pending codes... knock sensor 325 high circuit and 232 fuel pump secondary circuit high.
what gives???
I have changed fuel filter, air filter, cleaned MAF sensor and ran codes, had 2 pending codes... knock sensor 325 high circuit and 232 fuel pump secondary circuit high.
what gives???
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Joined: Aug 2003
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From: Isanti, MN
Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
The coils half fire half don't as they go out, the code does not set tell the thing gos out for good. BTW, All 96 and newer are OBD II.
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Modular motor junkie
Joined: May 2009
Posts: 6,190
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From: Texas
I have heard 3 different methods. 1 replace them all.
2, with it running pull one COP wire, put it back and pull another. It will run worse when you pull them off the wrong one. you found it when you pull it and it runs the same.
3 Drive it tell it dies ( the coil, not the truck) and sets a code. The way I do it.
2, with it running pull one COP wire, put it back and pull another. It will run worse when you pull them off the wrong one. you found it when you pull it and it runs the same.
3 Drive it tell it dies ( the coil, not the truck) and sets a code. The way I do it.
More Turbo
Joined: Nov 2004
Posts: 713
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From: Minneapolis, MN
HUH???
I'm nearly positive that OBD I died in 1996. HERE's a thread on another forum with someone reading OBD-II codes on an '01 7.3L Super Duty.
Senior User
Joined: Oct 2005
Posts: 462
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From: NW NJ
I'm at work so I can't check, but ...
I'm pretty sure my 2002 F250 5.4 is OBD II
Twice I've had a bad coil .... each time I had a "light load miss" that did not throw the MIL. Instead, the truck's computer is counting the misses --- pending codes --- before it throws the MIL.
I needed a code reader sophisticated enough to read the pending codes, and it gave me the offending cyclinder. (IIRC, I have an Actron 9145)
I'm pretty sure my 2002 F250 5.4 is OBD II
Twice I've had a bad coil .... each time I had a "light load miss" that did not throw the MIL. Instead, the truck's computer is counting the misses --- pending codes --- before it throws the MIL.
I needed a code reader sophisticated enough to read the pending codes, and it gave me the offending cyclinder. (IIRC, I have an Actron 9145)
Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
I would delete it and see if it comes back. A coil is most likely the problem.