1991 d250 O/D issues - Dodge Cummins Diesel Forum
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Go Back   Dodge Cummins Diesel Forum > 1st Gen. Dodge Cummins 89-93 12V Forums > 89-93 Powertrain
89-93 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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Old 05-28-2011, 04:51 PM   #1 (permalink)
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1991 d250 O/D issues

recently acquired a 91' in beautiful shape w. 180,000km ( 112,500 m.) with an A518 auto trans. problemnce the truck reaches operating temp.the overdrive will not stay engaged. Fluid level right on the mark where it should be. what should I be looking at? Truck has had an easy life and was not abused(senior owned) please help if you have any info. thank you.
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Old 05-28-2011, 05:09 PM   #2 (permalink)
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probably tps if you like get into od then it shift in and out type thing tps is very common on these trucks. Also ive heard if your speedo isnt working properly some people have had troubles with the o/d but its probably your tps. You can buy a new tps for $300 + or buy a tps delete from dnr customs lots of guys have started. Thats what im doing. 1st/2nd Generation Dodge TPS Delete Kit *91.5-98 12v* [DNR] - $39.99 : Zen Cart!, The Art of E-commerce
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Old 06-07-2011, 02:26 AM   #3 (permalink)
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thanks for the direction.I'll be takin' a closer look at the tps and the possibility of a delete kit. FYI new tps was quoted to me for $600.00 at the local dodge dealer. Not an option I want to persue.
Thanks again,
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Old 06-07-2011, 06:49 AM   #4 (permalink)
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Sounds like you might have a temp switch going bad. There are two switches in the OD wiring system. The first is a high temp switch located in the cooling line at the left front of tranny pan. ( I would suspect this one is bad). This one kicks out OD if the fluid gets too hot. The other one is located behind the fuel filter in the side of the block which will not let OD engage until engine temp is up to operating temp. You can simply unplug wiring and jumper across the plug with a short piece of wire to bypass switch. I have had both of my switches go bad and have bypassed them and have not had any problems with it for years. Also, I used the cooling line port for a tranny temp gauge which I prefer over a switch anyway. Good luck.
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Old 06-12-2011, 12:52 PM   #5 (permalink)
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Thank you yorel. Sounds like an easy fix and I'll try that one first.
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Old 08-31-2011, 01:18 PM   #6 (permalink)
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did any of those things work? I am having the same issue. Replaced the tps, cps, vss, and the trans temp sender still no luck.
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Old 09-11-2011, 10:20 AM   #7 (permalink)
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a 518 od shift problem

Quote:
Originally Posted by HANK1 View Post
did any of those things work? I am having the same issue. Replaced the tps, cps, vss, and the trans temp sender still no luck.
it turned out to be the throttle position sensor.
took the truck to a shop to verify the suspected problem with a code reader and then spent the bucks and bought a new one(tps) BUT the problem returned soon after. I had to adjust my tps.
On top of the fuel injection pump under the tps is a flat piece(looks like a big flat head screwdriver) that fits into the tps. This piece is removable and adjustable.It has a small bolt on the back side of it that fits into a hex slot on the pump. By turning the bolt and holding the slot head(or vice versa) you adjust the shift point (into o/d) on your transmission.
It took a couple of roadside adjustments but I got it to where I want it and seems to be working fine. Just pack along a proper size allen wrench,an 8mm wrench and a pair of pliers or a small cresent to hold that slot as you adjust the small bolt. hope this works for you.
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