Question about 1995 GMC Sierra

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Engine light on. Hard shift. Rough idle. Constant revving.

Engine light stays on. Rough idle. Once in drive it kicks into gear like a mule. I replaced the coolant sensor pigtail because I thought that was the problem. Now the engine light just says on. I'm positive I didn't cross the wires for it. I'm thinking it is my MAP sensor but I am not sure. I know it is something electrical. Need help with some solutions other than peppering it with bullets.

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  • GMC Expert
  • 207 Answers

Check engine (MIL) lamp illuminated ??
Scanned/codes retrieved ??

Posted on Dec 11, 2014

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6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: Truck losing power and service engine soon light on

Like to other guy said, give it a tuneup. Also try SEAFOAM to clean carb up of slug. Also check to make sure the butter fly for the choke has not come loose, causing it the choke it down. Failed choke pull-off.

Posted on Feb 02, 2009

  • 54 Answers

SOURCE: Check engine light is on and high idle (1500rpm)

Check for a vacuum leak.

Posted on Feb 03, 2009

  • 299 Answers

SOURCE: 2001 Tahoe: Hard to start, idles rough, check engine light on.

Flashing check engine light is missfire, fuel pump probably causing multiple tries to start.Having to build fuel preasure,vac leak on one side of intake probably causing rich/lean condition.Also check back preasure to cat ,Sound like you are moving down right track.Mas air flow would probably set lean code bank1 and lean code bank2

Posted on Jun 19, 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

  • 2926 Answers

SOURCE: My 2003 GMC Sierra Idles Rough And Cut Off

Before replacing the O2 sensors, I would check the fuel pressure. You may also try to have someone pull a trouble code from the powertrain control module to verify why the engine light is on. Do not replace any parts until this is done, otherwise your going to be guessing at the root cause, and it will get expensive with part replacement.

Posted on May 12, 2010

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