Question about 1993 GMC Sierra

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1993 gmc z71 service engine light comes on make transmission shift hard

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  • GMC Master
  • 1,250 Answers

Have transmission code retrieve
nobody will give you a fix for your problems without code

Posted on Oct 22, 2013

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

johnsmith992
  • 37 Answers

SOURCE: 1995 GMC Siera Truck Transmission

i gather its an auto transmission ,which mean your loosing oil pressure from the convertor inside the tranny housing.

Posted on Jan 29, 2009

  • 118 Answers

SOURCE: i have a 97 gmc jimmy 4x4. the transmission goes

I need the CODES this year has valve body problems for tcc slipping on these & shift timing need more information

Posted on Sep 07, 2009

Molson02536
  • 3854 Answers

SOURCE: how to reset the service engine soon light

If there is an Auto Zone or any other large auto parts store, have them scan the truck for the DTC codes. The DTC codes will identify the Issues that needs to be addressed in your engine and transmission that has set off the service engine light on. Once the issues has been resolved, the light will reset it self after the third start up and after 40 start up will erase it self from the history as long as there is no additional issues. Good luck and hope this helps, Shift suddenly become very hard. When going from park to either reverse or drive it slams into gear. 1-2 and 2-3 shifts are also harsh. All gears seems to work. Problem may be intermittent: Check TPS for smooth electrical response. If the response is jumpy or erratic at all, replace TPS.

Posted on Nov 11, 2009

  • 8404 Answers

SOURCE: I have a 1992 Gmc sierra manual transmission, the gears are hard

It is an adjustment or clutch replacenment issue. Manual transmissions rarely have a lube issue unless you have seen a big puddle of very thick oil in the driveway.

I think I'd be looking at the clutch of this 16 year old vehicle. Unless you have the tools, time and skill to change the clutch, this is probably a job better left to a professional. Adjusting the clutch mechanism might help for a while but I think you will soon need a clutch job on your GMC.

Thanks for your question at FixYa.com

Posted on Jan 14, 2010

  • 1244 Answers

SOURCE: what are the timing specs on a 1993 GMC Sierra

theres no advance wire on that engine!!! theres a hash mark on the back of the intake and one on the distrbutor shaft you set the distrib with the has mark and yes!! the ecm! will always reset the timing that is what is does but if it's pinging or knocking then change the ignition module cause the dwell side of it is out of range!

Posted on Jan 14, 2010

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1 Answer

My 1995 GMC z71 when the motor light comes on it starts idleing up and down it. Shifts ruff from reverse to drive and u have to put it to. The floor to get going and solutions?


Does it shift rough due to the idle speed of the engine? If I had to make a guess, it sound like the distributor cap has water in it or has melted a bit. Check into that. Could be a bad spark plug or wire too.

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1 Answer

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If there is an Auto Zone or any other large auto parts store, have them scan the truck for the DTC codes. The DTC codes will identify the Issues that needs to be addressed in your engine and transmission that has set off the service engine light on. Once the issues has been resolved, the light will reset it self after the third start up and after 40 start up will erase it self from the history as long as there is no additional issues. Good luck and hope this helps, Shift suddenly become very hard. When going from park to either reverse or drive it slams into gear. 1-2 and 2-3 shifts are also harsh. All gears seems to work. Problem may be intermittent: Check TPS for smooth electrical response. If the response is jumpy or erratic at all, replace TPS.

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