I have a 1990 GMC sierra, 2500 that is not starting. It's cranking though. I have a new distributor in, I have ohmed the coil- it checks out on continuty. But I still have no spark supply to the distributor ! Could the coil still be bad ? PS I did check the coil wire too, its okay.

SOURCE: truck turns over but won't start 87 gmc 4x4

Well, if it was running prior to your replacing the plugs, then somewhere you went amiss. Check the firing order. If when you crank the engine over and it pops and backfires then you have a few plug wires mixed up. Other than that the other item to check would be the rotor button in side the cap. Is it lined up correctly or broken? Good luck.

Ronny Bennett Sr.

• 6988 Answers
• Posted on Jan 19, 2010

SOURCE: F150 V 8 NO Spark replaced coil / distributor w/

There is no crank shaft sensor for this truck,check all fuses,make sure there is none blown,check for 12 volts at the coil,if there is no voltage at the coil,replace the ignition switch,if there is voltage at the coil,make sure the rotor button,is turning when turning the engine over with the starter.If the rotor button ,is not turning,then the timing chain,in the engine has broke.I do not know how to tell you to check the map sensor,but if it is bad,it will not fire.

SOURCE: my 1989 gmc 2500 sle sierra wont start iv replaced

Check if there is power going to the distributor

SOURCE: my 1990 jeep wrangler won't start. the engine

Check your Crankshaft position sensor