Question about 1986 GMC K2500

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Running terible well i have lots of symptoms and this is the order in witch they ocured lack of power ( top gear pedal floored at 45 kmph up a 5% grade hill ) exhaust leak under hood ( looks to be exhaust manifold gasket ) hard starting ( turn key and it starts give it fuel and it quits cold or hot ) no choke ( no choke warm or cold whatsoever ) fuel consumption (1/4 tank per 10km around 75L tank ) reluctant to shift up ( pedal floored very high rpm then it shifts to 2nd ) wont shut off ( you shut the key off engine continues to barly run then huge backfire and then it stops ) idles high sounds terible ( while driving there is a terible poping sound ) constantly backfires i know its a big list but every one else has no clue and i am stumped myself i have an 86 5.7 small block 350 v8 Gmc crew with a turbo 400 3 speed auto 2wd no a/c

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For one thing the cabureter need rebuilding, and the choke repaired, fix that exhaust leak, most of what you describe relates to fuel, also run some combustion cleaner through the engine, its been running rich and there are deposits causin dieseling when you shut it off, all of this is easy for an older mechanic

Posted on May 11, 2010

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