F350 WOT problem - Pirate4x4.Com : 4x4 and Off-Road Forum

wi fordguy · 09-20-2011, 02:52 PM

Looking for a little help here.
1996 F350
460
E4OD
4WD
Crew Cab Long box

Why is this damn thing shifting at 3500 RPM at wide open throttle? Trans was rebuilt less than a year ago and I've been fighting a number of issues with it since then.

krugford · 09-20-2011, 06:49 PM

Option 1) Using a PCED, EVTM, a multimeter, and an alcohol consumption rate of 4.3 beers/hr (3 hour minimum), carefully track down the wiring and/or sensor problem that's causing your truck to behave in a retarded manner.

Option 2) Start replacing sensors at random and hope the problem goes away

Option 3) Buy a donor truck and perform a ZF swap. Remember, when buying a donor truck, that you have a brother who needs some nice gray seats and possibly a new crew cab. This brother may also be willing to go in with you on a donor truck purchase...

Option 4) I'll take your truck off your hands for you for a minor processing fee, therefore eliminating the problem from your point of view. It's a WIN-WIN!

OR..... if you really want help here, how about a well written, grammatically correct, chronological account of what the truck has been doing, it's symptoms, when it does it, what it does, how long does it do it, etc etc.

'62 Dodge · 09-20-2011, 07:18 PM

Does is shift hard? Check the throttle body.

f350n4.6ranger · 09-20-2011, 08:20 PM

Quote:

Originally Posted by wi fordguy

Looking for a little help here.
1996 F350
460
E4OD
4WD
Crew Cab Long box

Why is this damn thing shifting at 3500 RPM at wide open throttle? Trans was rebuilt less than a year ago and I've been fighting a number of issues with it since then.

PULL CODES. and..... uh, call up the trans builder?

Edit: Check fuse #17. IIRC they had issues with wiring in the steering column shorting out and causing funky shifting issues.

wi fordguy · 09-21-2011, 07:31 AM

No codes. And it's been to the trans shop twice, they say its not throwing codes so its fine. It has a shift kit and is shifting normally, no "hard shifting". The warmer the truck gets the more erratic the shifts become.

f350n4.6ranger · 09-21-2011, 09:20 AM

Since it is a 96, monitor live engine data while it warms up. After sitting overnight, compare the ECT data to the IAT data and ambient temperature. Maybe the PCM thinks it is overheating and shifting it early. I'm not sure on the obd2 OBS trucks how the shift schedule is determined.

Check the TPS with the live scanner and engine off to see if it makes a full and clean sweep. If you see it dead stop at 60% with your foot to the floor, the computer has no way to know that you are NOT at 100% and shift it early. Any aftermarket tires? gears?

Pull the VSS off the rear axle (very top of housing) and clean it off. Metal can stick to it an cause all sorts of weird shit to happen.

wi fordguy · 09-21-2011, 11:45 AM

I'll hook up and monitor warm up, that's a good idea. It's not OBD2 so that's no issue. I checked the TPS this morning and it does a very smooth sweep between .9 closed and 4.6 WOT. All in normal range. Is the TPS affected by temp? Should I check it again at full operating temp?

The VSS was replaced by the trans shop because it was setting a code, as was the shift position fella on the side of the trans. No aftermarket gears or tires, only axle mod is a Powertrax.

09-20-2011, 02:52 PM	#1 (permalink)
wi fordguy Registered User Join Date: Aug 2011 Member # 196396 Location: West Salem, WI Posts: 41	F350 WOT problem Looking for a little help here. 1996 F350 460 E4OD 4WD Crew Cab Long box Why is this damn thing shifting at 3500 RPM at wide open throttle? Trans was rebuilt less than a year ago and I've been fighting a number of issues with it since then.

09-20-2011, 07:18 PM	#3 (permalink)
'62 Dodge Registered User Join Date: Mar 2007 Member # 88995 Posts: 113	Does is shift hard? Check the throttle body. __________________ I remember grade school and started to notice that I was the only kid sitting alone.

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09-20-2011, 06:49 PM	#2 (permalink)
krugford Got Solar? Join Date: Dec 2007 Member # 105362 Location: Iowa Posts: 159	Option 1) Using a PCED, EVTM, a multimeter, and an alcohol consumption rate of 4.3 beers/hr (3 hour minimum), carefully track down the wiring and/or sensor problem that's causing your truck to behave in a retarded manner. Option 2) Start replacing sensors at random and hope the problem goes away Option 3) Buy a donor truck and perform a ZF swap. Remember, when buying a donor truck, that you have a brother who needs some nice gray seats and possibly a new crew cab. This brother may also be willing to go in with you on a donor truck purchase... Option 4) I'll take your truck off your hands for you for a minor processing fee, therefore eliminating the problem from your point of view. It's a WIN-WIN! OR..... if you really want help here, how about a well written, grammatically correct, chronological account of what the truck has been doing, it's symptoms, when it does it, what it does, how long does it do it, etc etc.

09-21-2011, 07:31 AM	#5 (permalink)
wi fordguy Registered User Join Date: Aug 2011 Member # 196396 Location: West Salem, WI Posts: 41	No codes. And it's been to the trans shop twice, they say its not throwing codes so its fine. It has a shift kit and is shifting normally, no "hard shifting". The warmer the truck gets the more erratic the shifts become.

09-21-2011, 09:20 AM	#6 (permalink)
f350n4.6ranger Registered User Join Date: Jan 2010 Member # 152532 Location: Montgomery County, MD Posts: 686	Since it is a 96, monitor live engine data while it warms up. After sitting overnight, compare the ECT data to the IAT data and ambient temperature. Maybe the PCM thinks it is overheating and shifting it early. I'm not sure on the obd2 OBS trucks how the shift schedule is determined. Check the TPS with the live scanner and engine off to see if it makes a full and clean sweep. If you see it dead stop at 60% with your foot to the floor, the computer has no way to know that you are NOT at 100% and shift it early. Any aftermarket tires? gears? Pull the VSS off the rear axle (very top of housing) and clean it off. Metal can stick to it an cause all sorts of weird shit to happen.

09-21-2011, 11:45 AM	#7 (permalink)
wi fordguy Registered User Join Date: Aug 2011 Member # 196396 Location: West Salem, WI Posts: 41	I'll hook up and monitor warm up, that's a good idea. It's not OBD2 so that's no issue. I checked the TPS this morning and it does a very smooth sweep between .9 closed and 4.6 WOT. All in normal range. Is the TPS affected by temp? Should I check it again at full operating temp? The VSS was replaced by the trans shop because it was setting a code, as was the shift position fella on the side of the trans. No aftermarket gears or tires, only axle mod is a Powertrax.