I have a 95 blazer 4.3 will turn over but want start. Has 56 to 58 lbs fuel presure at the back of the intake plenium. removed top plenium and has spider fuel injection. Can spray with starting fluid and still will not even try to hit. Coil fires and plugs fire. Connected spark plug and grounded on top of motor and fires every time. Was running great when turned off but will not start. Im lost on this one and dont know what to check next.

 

You have fuel & spark, but is the spark timed properly...? Have you tested compression?

 

The timing mark on crank shaft pulley lines up with number one on compresion stroke and rotor button pointing to number one plug wire. Thanks

 

I have borrowed a compression guage but have not checked compression yet. How many pounds should it read? Thanks

 

Does your cap have horizontal terminals or vertical (pertaining to the orientation of the towers the plug wires connect to)? If it has horizontal terminals, then you should have two timing marks on the balancer and the rotor should point to a little triangular boss in the base of the distributor housing.

As far as compression goes, it should be somewhere above 100psi and all cylinders within +/-5% of each other.

 

It cap has vertical towers.

 

did you check your distribiter ,my k5 did the same thing and i replaced the coil and it still wouldent do start ,tryed cap ,still wouldent so then i did the whole distribiter and it started up and ran fine.