My 1994 GMC Sierra 1/2 ton 4x4 pickup wont start. There is a clicking noise as if the battery is dead when you try to start it and the engine will try to turn but it turns extremely slow as if its not getting enough juice. The battery is good, the starter and cylinoid is good, fuses are good, and the clutch is engaging. Any idea what my problem could be?

1-8-4-3-6-5-7-2

Driver side cylinders, starting at the front of the engine, are 1,3,5,7

Passenger side, starting at the front, are ,2,4,6,8

Hope this helps.

For the ECM 1 fuse to open you obviously have a short to ground , start with the injector disconnected and see if ECM 1 fuse still blows.If it does disconnect crank sensor, also inspect wires for the injectors or any rub through wires here is a diagram

do your headlights come on bright.if not check your battery cables or all your fuses.if so could be fuse or starter sol.has burned out.

I’m happy to help further over the phone at https://www.6ya.com/expert/kenneth_3efc1f8510674f04

Replace the pickup coil in the distributor,this pulsates the injectors.

Replace the coolant sensor on the front of the intake manifold.The coolant sensors on this engine does go bad and wont set a check engine light. The sensor will read about -32 to 0 degrees when they do go bad. The computer thinks it is that cold and sends tons of fuel to the engine. If you try to start the engine with the throttle depressed to the floor it puts the fuel system in clear flood mode and wont fire the injectors. Engine will start then and run very rich. The coolant sensor has two wires on it and sometimes you need to replace the wiring pigtail going to it as the sensor can seep coolant into the connector and corrode the terminals. All the parts are available at pepboys and autozone or napa. Good luck

loose connections and starter relay in power distribution box under hood. Make sure you dont have a loose or poor connection on a ground or power wire from battery.

your description sounds like the gears inside the the same differential you just replaced.

check the fuse for the hazard light and turn light. also check the bulbs for all light make sure they are good

does the starter make a "clicking noise" when it wont turn over? check your battery cables at the battery and at the starter solenoid....if it not a connection , then it sounds like a bad starter relay/solenoid

hello: i have a 1994 GMC SIerra 1/2 ton 2 wd, the first two gears shift find but when you get up to about 55 or 60 mph, the transmission wont shift.