Question about GMC Yukon
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?
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
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"
SOURCE: 4D56 turbo diesel engine in
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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.
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Posted on Jun 11, 2011
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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