1989 gmc 5.7 liter replaced engine with slightly used rebuilt engine from a junk yard .i used my distirbuter coil and carb .i'm getting spark and fuel cheched timing several times only back fires i tried starter fluid went to start it back fired but this time it blew the valvue covers out

Asked by Apr 23, 2017 at 01:45 PM about the 1989 GMC Sierra 1500 C1500 Extended Cab LB

Question type: General

has this happened to anybody before what is wrong with this engine how do i
fix it.......

1 Answer

77,795

The timing or firing order has to be off. When putting in the distributor, did you bring #1 piston up on the compression stroke and to TDC?

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