How bad is the idle??I have a 2006 GMC Canyon with 26000 miles.. one day on my way to work I pulled up to a red light and the truck was idling very bad..I stopped and check my oil it was in the middle of the L and F so I thought I was good.. I tried everything I was going nuts.. The next day I seen a friend of mine told him what was wrong and he told me to make the oil level was just past the full mark.. If the oil is not high enough it will screw up the timing and the truck will not idle right..So I tried it and my truck was back to running fine again..
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I have an 05 canyon. It was running rough and losing power at stop lights. I got the throttle body cleaned and it runs great now. Try that its an inexpensive fix. It needs to be done about every 25,000 miles.
ROUGH IDLING CAN BE CAUSE BY MANY THINGS.I AM LOOKING AT LEAKING VACUUM HOSES OR INTAKE MANIFOLD GASKET LEAK.DIRTY FUEL INJECTORS AND WORN ENGINE VALVES WILL CAUSE ROUGH IDLING.ALSO LOW IDLE SPEED CAUSE ENGINE TO RUN ROUGH.
You can to the Salvage Yard for a new computer, but your going to have to get it reprogram to your ignition keys, so the Passlock will start the engine. Before you go through all of that. recheck every thing, it could be your crank sensor or your ICM faulty causing your engine to shut down. Keep me posted and let me know what DTC codes you have. Note: a faulty fuel pump or dirty fuel filter will not set a DTC code. You may have a dirty fuel filter or faulty fuel pump or faulty fuel pump wire harness or fuel pump relay.
there is recall because of this problem. the same thing ws going on with mine. contact your gmc dealership. it is a valve problem in the head.the recalll is not published but if take it to the dealer he can check to see if this the problem. this was a cyl. head problem.