Question about GMC Yukon

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What makes a 1995 Turbo Diesel GMC Yukon accelerates on it own?

My 1995 turbo diesel GMC Yukon revs high then low when I'm idle and when I'm driving it accelerates increasingly even when I barely tap the gas pedal or let off it completely and will continue to do so unless I hit the brakes. when I am in park I lightly tap the gas pedal and the rpm shoots up and red-lines to 5,000. Any idea what could be the problem?

Posted by Mike Espaillat on

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mike watson

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  • Master
  • 474 Answers

There should be a control unit on top of the engine that controls this to keep the engine at a certain temp which runs off the engine block temp sensore. I would try changing the sensors first located on the drivers side front of cylinder head and in the goose neck on top for one of the thermostats.It wouldn't be a bade idea to change the thermostats too at the same time.

Posted on May 01, 2014

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keemo68

Ronald Mueller

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SOURCE: diesel turbo with no power at low revs

this tells me that the injector timing is off just a bit or you may have a weak injector all together.

Posted on Sep 05, 2008

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Anonymous

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SOURCE: ford focus turbo diesel low oil pressure with no knocks from engine

Possible oil sending unit problem.

Posted on Oct 24, 2008

SQUIRESXX

cock cock

  • 486 Answers

SOURCE: Hyundai i30 Diesel automatic won't accelerate above idle at light

DOES THE ENGINE MIL WARNING LIGHT COME ON? WITH OUT MORE INFO YOU NEED TO CHECK MOTOR ON A CODE READER FOR STORED FAULTS, CHECK ALL AIR LINES TO EMMISION CONTROL, , SOUNDS LIKE YOU HAVE GONE INTO SAFE MODE, A SPLIT OR LEAKING PIPE ON THE INTERCOOLER IS A COMON FAULT ON THESE, IF YOU SWITCH ENGINE OF AND BACK ON QUICKLY WITH MOTOR RUNNING WITH OUT STALLING MOTOR AND IT CLEARS THEN IT IS PROBERLY THE SAFE MODE CUTING IN MEANING A FAULT HAS BEEN SEEN BY PCM

Posted on Dec 07, 2009

Testimonial: "Thanks.Didn't notice any engine lights came on. I had a problem free day today, but if it happens again will check warnings and PCM computer check"

elix0411

Jose Cada

  • 3530 Answers

SOURCE: 4D56 turbo diesel engine in

Welcome to Fixya
Error 41 is the butterfly spindle in the intake manifold just below where the hose from the intercooler joins. It should be open when engine running if it is closed it will cause boost issues and running problems.
Thank you for using Fixya!

If you need further help, reach me via phone at https://www.6ya.com/expert/elixirjose_00375ea24bd8141b

Posted on Jun 11, 2011

AskJack

Jack McCann

  • 117 Answers

SOURCE: engine idles up, down and low while under 1000 rpm

It is the ISC motor, (Idle Speed Control) it costs around $30.00 and can be found at most automotive stores. If standing in front of car looking at engine, it is located near the front towards the left. Your throttle cable is connected to it. There are four small screws that hold it to a bracket, pay attention to the rod with a small dial type wheel sticking out the end and you will see it go in and out of that motor casing. Your's is sticking. replace that and you should be good to go.

Posted on Aug 26, 2012

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