Question about GMC Cars & Trucks
My boyfriend's 2004 GMC Sierra 2500HD 6.0 litre gas engine truck has been idling really high and when were driving down the road it doesn't seem to have any power, then suddenly the power kicks in and the truck runs kinda normal, we have a bully dog system in the truck and it doesn't say anything is wrong with the truck, and sometimes when we are driving it will quit but will restart immediately, the truck also has a 6 inch suspension lift in it also, can someone help? We have been thinking about maybe replacing the computer but want to know other things to check before we have to spend a fortune on a computer.
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Posted on Jan 02, 2017
It sounds like a fuel contamination problem or fuel filter/pump problem. Did the problem start after a recent fuel fill, if not, has the fuel filter been changed at any time, if so, check fuel pressure. Pressure should be 30 to 40 pounds.
Let me know.
Posted on Mar 07, 2009
if it is electrical oil pressure sensor I would start there. The best way to see if you have a major problem is to use a mechanical oil pressure tester. Take off the oil pressure sensor and put the mechanical tester on. The tester should come with a Gage. If it comes within your trucks oil pressure range than all is fine and replace the sending unit and see if that don't help your problem.If the tester runs high then the oil pump is bad or your cam-bearings could be the problem. But with cam-bearings you would usually get a low reading.
Posted on Mar 14, 2009
I put a new fuel pump, fuel filter, and a fuel pump relay and the fuel pump is still not coming on. I am not getting any fuel. Can you please tell me what it might be.
Posted on May 02, 2009
someone has cut the dash off you need to go to the information center and press menu it will give the options to cut it on or off
Posted on Jul 04, 2009
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