Question about 1993 GMC Sierra

I have a 1993 GMC Sierra 4x4, with a 350 motor, a 4L60E transmission with a 3/4 ton upgrade and shift kit as well. Now when i press on the accelerator it falls on its face and then picks back up. throwing a low throttle position code as well as exhaust gas recirculation error. It does not have the egr valve hooked up(never did) it did have an exhaust leak but i fixed that. I have adjusted the accelerator cable (I dont think i should have done that) another problem is when i shift from park to reverse or drive it snaps into gear. some one help me please

1 Answer

Jerry Ross

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GMC Master
1,061 Answers

I would check the engine timing and do a check on the exhaust to be sure it is not partially blocked. As to the snapping when you shift I would check the universal joint to be sure it is ok and the rear end may have some play in it.

Posted on Apr 29, 2017

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Posted on Jan 02, 2017

dtrannyman

158 Answers

SOURCE: no reverse after rebuild on 4L60E Transmission from 1995 GMC Sono

There isn't a modulator on this trans as it is electronic

You can have first gear going forwrd but no reverse. It is possible. The low/ reverse clutch isn't needed to go forward.

Posted on Apr 02, 2009

6bta

400 Answers

SOURCE: looking for ignition switch in 93 gmc sierra

Tword the bottom of the steering colume. It will have a couple of connectors going to it and a couple of rods going to it from the igniton cylinder. IT is on top and not easy to get the bolts out of it. You will need to remove the close out pannel to even be able to see it.

Posted on Oct 20, 2009

Juble

37 Answers

SOURCE: 95 GMC Sierra 4L60E will not shift down to 1st or up to 4th.

no power stuck in 3rd gear electric shop unless youve burnt it up good luck...www.TransmissionGarage.com

Posted on Dec 30, 2009

Harvey N Tawatao

3854 Answers

SOURCE: 95 GMC Sierra 4x4 350 5.7 rough idle problem

It sounds like a MAP sensor going bad. MAP is short for manifold absolute pressure sensor, it senses the manifold pressure and applies the right amount of gas with the right amount of ignition timing so the car runs and performs well if this does not work properly. It throws off the whole loop cycle for the computer, which in turn makes it run badly and get poor fuel economy. It can causes the engine to have a lack of power, combined with a loss of fuel economy. Poor take offs and sometimes an occasional stalling may occur if the MAP sensor is faulty and sending the wrong signals to the ECM.
Hope this helps and thank you for using Fixya.
Here is a link that my help you in the future. http://www.troublecodes.net/GM/

Posted on Mar 16, 2010

Ronny Bennett Sr.

6927 Answers

SOURCE: 1994 gmc sierra 1/2 ton 350

Replace the pickup coil in the distributor,this pulsates the injectors.

Posted on Apr 14, 2010

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