1994 CHEVROLET C1500 PICKUP 4.3L V6 vortek cranks no start backfiring thru the Throttle body fuel injection system. The Distributor has a small hairline crack under the reluctor wheel could this be the problem? Replaced cap, rotor, ignition coil, pick up coil, Ignition Control Module (ICM), spark plugs, and spark plug wires. It has Lots of spark to all cylinders. It has good compression around 100 LB or more in all cylinders. The throttle body fuel injection system was rebuilt the fuel injection preacher regulator diaphragm was replaced and new injectors were installed. When cranked the throttle body fuel injection system sprays out 2 nice cones of fuel. I was able to aliened the timing at TDC it did not change anything. Thanks Ron z

Your engine is flooded with fuel. Check your throttle body if it's a fuel injected engine. Clean it. Remove spark plug, let it dry or replace with new ones.Try flooring your acc pedal and start. If it starts, you need to get the carb serviced. For fuel injected, you need to service/ repair/replace your throttle body, fuel injectors, idle air control valves and EGR.

When you state you have a "Cap & Rotor", indicating an engine, which may possibly be OLDER than the 1994 S-10 it is in. A Crank positioning sensor, on a full throttle body, (or do you mean carburetor/combo/injector system) Not the true name, but, in appearance, looks like a carb. It has a "pulsating" injector within the opening of the butterfly/mouth of the throttling body. When you have an ECM, or Computer Command timing, with a crank sensor, you will have 2 coil packs for 4 cylinder, a 3 coil pack for a V-6. They will be just under the electric cooling fan for the radiator. If you are driving a "bought used" vehicle, and the Cap, Rotor, & wires are only accessed thru the RH wheel well, it is a "Distributor System" & an OLDER engine. The Back fire is being caused by a "jumped" timing belt, or HOPEFULLY, a crossed spark plug wire.

map sensor

check to make sure they sold you the right fuel pump. they are two pumps for a 4.3 ones a vortek and one is a throtlle body. the eighth digit of the vin will tell you one is a vin w and one is a vin z. the throtlle body only puts out about 11psi of pressure and the vortek puts out about 60psi of pressure.if you put the throttle body pump in a vortek engine there is not enough fuel pressure to run it.

You first need to check the fuel pressure, an easy way to access this is to buy a can of spray starting fluid, spray it into the TBI throttle valve and if the truck starts and dies you have no fuel pressure. Replace the fuel; pump, and make sure you get the right pump, it is a low pressure system.

1999 chevy 1500 series has spark getting fuel wont start replaced crank position sensor cap n rotor getting backfire through throttle body.

jumped time or burnt valve

Counter-clockwise on the distributor in the figure...it is 1-2-3-4-5-6....#5 is the blue one and #6 is the purple one then #1 and so on....

bad dis cap or rotor maby a bad plug wire or valve sticking or out of adjusment

what is your fuel pressure like? im guessing you have injection on this still.