Question about 1990 GMC K2500
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.
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.
Posted on Nov 08, 2008
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Posted on Jan 02, 2017
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