Question about 1998 GMC Sierra
I would check the valves for number 6. If one or both are burned, stuck or out of adjustment it would cause your problem. If a cam lobe for that cylinder is burned or badly worn it could be the culprit.
Posted on Jan 10, 2010
wow you love spending money for nothing ,ask a local mechanic where the engine temperature sensor is located for the automatic choke and change it as i dont think its working correctly so mixture is weak hence the loss of power till engine warms up ,remember this vehicle is well past its sell by date so it may also pay to do a compression check as it could also be low on compression and its needs the valves grinding in and maybe new piston rings ,anothe pssibility is the head gasket it could be failing and blowing between two pistons and sealing up a bit when it warms up ?? who knows as their too many weird and wonderful faults with a motor vehicle .But i would go for the autochoke temperature sensor first where ever its located as iam a europeon mechanic and never seen this vehicle except on the TV so please forgive my ignorance of component location .
Posted on Sep 13, 2011
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