Throttle Position Switch

[Archive]

Anyone had experience setting the TP switch? Mine got out of position earlier in the year, caused several uncommanded downshifts from OD to 3rd. Had it set at a garage, although it seems set too soft. Any acceleration <50 mph and it will down shift, re engaging cruise will cause it to happen, even when running empty. At speeds >50 mph OD will stay engaged and acceleration is normal.
Thanks in advance.



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Ian.

'93 D250 ext. cab. Upgraded injectors, 3. 5" exhaust, K & N filter, Xmsn oil cooler and fan, 4 gauge mount, mirror tubes reversed, RACOR fuel filter, larger transmission oil pan.

 

[Archive]

Put a bent paper clip into the center connector in the electrical TPS harness while leaving it all connected. Connect the + lead of a digital voltmeter to the paperclip and the - lead to a good ground. Turn on the ignition but do not start. At rest the TPS should read 1 volt + or - . 02 volts. At full throttle it should read 2. 3-2. 7 volts higher then the at rest reading.
If a reading of + or - 1 volt can not be obtained at rest by loosening the 2 6mm bolts and rotating the TPS try adjusting the throttle linkage at the flat and nut and shorten or lenghthen as required. If you still cannot obtain a correct reading at WOT or rest... replace TPS.
Paul R. Haller

 

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The above instructions are for a 97 TPS.

 

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your 93 is adjusted to the same specs, but to adjust the sensor you need a 10mm open end wrench, the sensor is adjusted from the underside right where the sensor meets the pump ... ... ... Rick


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93 W 250, Banks,B&D,K&N,JRE,Rickson 19. 5's,FourWheel camper. <A HREF="http://rducsh.homestead.com/truck.html" TARGET=_blank>
Truck Spec Site</A>
<A HREF="http://albums.photopoint.com/j/AlbumList?u=279120&Auth=false" TARGET=_blank>
Photo Site</A>

 

[Archive]

This tip comes from a post by Don but I don't remember which one, it works great:
Put a small safety pin through the center lead to the TPS connector, you can just leave it there. Then all you need is your volt meter and a 10mm wrench.

HAPPY RAMMIN!!!
Caleb

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1993 LE W250 4x4 CC,Auto,3. 5's,Limited slip. Diamondplate,K&N,Egt,Boost,trans temp VDO Vision series, BD 3 1/2" Exhaust, 16cm housing,Mag Hytec Diff+ Trans pans,Transgo TFOD shift kit,Roadmaster Active Suspension.

[This message has been edited by boatpuller (edited 11-02-2000). ]

 

[Archive]

yes just had the same problem, My only solution was to replace the switch. You dodge dealer keeps them in stock. Cost is high $250 US . but it made a great differenc. I had not realized how bad it was at shifing when it should. My truck runs and shift like anew one.
dean

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1993, W350, 70K miles, two toned paint, mopar tack, rhino liner,LE, club cab, 22mpg.

 

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TPS purchased 9/27/00 at Cummins Northwest Coburg,Oregon:
Part number: 3621094
Cost: $121. 50

Caleb

 

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Many thanks for the tips, part numbers etc. I don't own a digital voltmetre but I think I can borrow one.
Thanks again.
Ian