no overdrive
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New User
Joined: Sep 2007
Posts: 10
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From: yakima, washington
no overdrive
heres my problem, I have a 1990 f-250 2wd with the e4od with 135,000 miles when Im driving or towing (more so when towing) the truck wont go into overdrive. it works fine when cold but when it warms up it wont go in, ( if it is in overdrive it will kick its self out) I just put a new tpsw senser on it and still no change whats next?
Post Fiend
Joined: Nov 2004
Posts: 5,638
Likes: 1
From: Manitoba
If it kicking out then it is hunting for the correct gear......... in this instance turn OD off. Trans is politly telling you it can't tow in that gear....
TPS on a diesel is called a Fuel injection pump lever.. sensor (FIPL). Did you set the FIPL to correct specs.........
You can try this........
To set to specs:
With a warm engine and the idle speed set to your engine specs probably 650 in drive (curb idle) shut off the engine.
Now with "Key On Engine Off". First connect the negative lead of a volt meter to the negative battery post, then place a paperclip straightened to slide up the side of the center wire for a good contact, touch the positive lead to the paperclip. Electrical connector must be connected to the FIPL.
If your FIPL requires resetting loosen the small torx screws and attempt to attain the correct setting. You can loosen the large bolts on the bracket if necessary but try to retain the centering on the FIPL/blade.
Your trying to get closed throttle voltage: 1.1 V, wide open throttle voltage: minimum of 3.8 V but not more than 4.3 V.
If you can attain those #s then tighten the screws/bolts and ensure the voltage is at the correct setting after tightening. You can also do a slow sweep of the fuel lever from idle to WOT to see if there are any blanc (dead) spots, much easier with a really $$$ meter with capture mode. If you still find there are hard shifts or very soft slippery shifts you can adjust to suit your driving but be warned slippery shifts will burn the trans up.
TPS on a diesel is called a Fuel injection pump lever.. sensor (FIPL). Did you set the FIPL to correct specs.........
You can try this........
To set to specs:
With a warm engine and the idle speed set to your engine specs probably 650 in drive (curb idle) shut off the engine.
Now with "Key On Engine Off". First connect the negative lead of a volt meter to the negative battery post, then place a paperclip straightened to slide up the side of the center wire for a good contact, touch the positive lead to the paperclip. Electrical connector must be connected to the FIPL.
If your FIPL requires resetting loosen the small torx screws and attempt to attain the correct setting. You can loosen the large bolts on the bracket if necessary but try to retain the centering on the FIPL/blade.
Your trying to get closed throttle voltage: 1.1 V, wide open throttle voltage: minimum of 3.8 V but not more than 4.3 V.
If you can attain those #s then tighten the screws/bolts and ensure the voltage is at the correct setting after tightening. You can also do a slow sweep of the fuel lever from idle to WOT to see if there are any blanc (dead) spots, much easier with a really $$$ meter with capture mode. If you still find there are hard shifts or very soft slippery shifts you can adjust to suit your driving but be warned slippery shifts will burn the trans up.
Thread Starter
|
New User
Joined: Sep 2007
Posts: 10
Likes: 0
From: yakima, washington
I had the sensor adjusted to 1.1 volts and the shifts were very harsh (break your neck going into 1st) backed it off to .88 shifts good. it will also do this when im not towing
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