Cydways
Junior Member
- Joined
- Oct 4, 2020
- Posts
- 8
- Reaction score
- 0
- Location
- Council Bluffs, IA
- First Name
- Mike
- Truck Year
- 1990
- Truck Model
- V2500 Suburban
- Engine Size
- 350
1990 Suburban 5.7 TBI. I had been having problems with the truck idling high and running poorly, found out the throttle body gasket was bad. So bad, it had a huge chunk missing when I pulled it off.
So I decided to rebuild the throttle body. Put it back on and now the engine cranks but will not fire. There is no injector pulse. The fuel pump does not prime when I turn the key, but it will run when cranking and for a couple seconds after cranking.
I checked the TPS because I heard that can prevent the injectors from firing if it's broken. There is no voltage at all - no power going to it and thus no voltage at the blue wire.
I am at a loss. If the fuel pump does run, even though it does not 'prime,' shouldn't the relay be good?
What would prevent power from going to the TPS?
So I decided to rebuild the throttle body. Put it back on and now the engine cranks but will not fire. There is no injector pulse. The fuel pump does not prime when I turn the key, but it will run when cranking and for a couple seconds after cranking.
I checked the TPS because I heard that can prevent the injectors from firing if it's broken. There is no voltage at all - no power going to it and thus no voltage at the blue wire.
I am at a loss. If the fuel pump does run, even though it does not 'prime,' shouldn't the relay be good?
What would prevent power from going to the TPS?
