Question about 1990 GMC K2500

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1990 gmc k2500 new 5.7engine & turbo 400 ,power lose & noise.

Truck was running fine,4000k on new engine,driving on freeway 105 k.sudden noise ,as if motor is working harder and lose of power.No gauge changes witnessed.kept driving home.When hard accelleration is attempted, only loud strugling noise a howell or racing ,no banging or clicking .It does shift the three times in drive but seems to really struggle to get there,and really loud when pushed or if kicked into pass.Got home np.proceeded to check distributor cap,fluids,rotor,timing,all checked good .exhaust system looks fine and at idle runs and starts nicely.

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  • Anonymous Mar 29, 2014

    we went for apprx a 30 mile drive and the tuck was running good. When we got back to town it seemed to hiccup acouple times but still came up to speed and had decent power. Not great. It sat for apprx 2hrs and then was moved about 200 yds. was idling fine but never tried to really go anywhere. We started and moved it the same distance. Same thing seemed to be OK. When we returned 4hrs later to take it home it would not run good at all sputtering,kinda jumping, we could gain no speed it hasnt run well at all since the 30 mile drive and now wont even turn over. I cant even seem to hear a click at the starter.HELP



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Sounds as if you may be looking in the wrong spot. If different gearing is drastically changing the symptoms you may want to check the trans. or torque converter. sudden pop with engine rpm increase and lack of power sounds like possible band breakage in transmission or impellor breakage in torque converter.

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