What does it mean if the motor starts then cuts out when the key is returned to the run position in a 1989 Chevrolet pickup with a 3500, 454 engine?

Answer by  happytimes63 (865)

You could have several problems. clogged Fuel filter, dirty injectors, worn spark plugs, moisture in the fuel system, worn plug wires, fuel pump wearing out, Start with the cheapest things to try first and see if it improves.

Answer by  Brad86 (23)

The problem could lie in either your idle setting or the fuel filter. The filter should be located somewhere along the fuel line, when the engine starts sediment gets sucked up against it and it clogs.

Answer by  Ionoone (112)

Ignition is possibly bad you if your mechanicly inclined you can remove the power wire to the coil and replace it with one directly to the battery and see if it is the ignition causing the interupt in power, If not definetly go to a mechanic

Answer by  7david7 (55)

You need the key electrical switch replaced. There is a difference between the key "lock cylinder" and the key "electrical switch".

Answer by  B28 (46)

What you might be doing is starting the engine when it is already starting. This could be very bad for the car, therefore the car tells itself to shut off so it doesn't break anything.

Answer by  bb300 (110)

it is possible that the ignition switch is going bad. check with a mechanic for a new igmition switch for that model.