No fuel to injectors

DDOAN

MEMBER
CHEVROLET TRUCK

I have a 93 Chevy Silverado Z-71 4x4 with a 5.7 V-8. It has 175000 miles on it. I lost fire, but had fuel. It was running and just shut down. After replacing the coil (which didn't fix the no fire) I tested the rest of the ignition components. All tested fine. When I put it back together I had fire but now have no fuel through the injectors. All tests show everything is good. I have fuel all the way to the thottle body. Changed the ECM since everything tested out fine. All fuses and fused links are good. Will start if you put fuel straight in the TBI. Filter has been checked, all electrical ahs been checked and test out according to the repair manual. What am I missing.

3 Replies

E40WATER12

MECHANIC
522 POSTS

When you are starting youre truck when, turn the key to acc, Do u hear the fuel pump kicking on, Humm or buzz sound. I would get a fuel pressure test done on the pump.

Was this

answer

helpful?

Yes

No

Saturday, May 26th, 2007 AT 11:21 PM

ROCKYSCAFIDI

MEMBER
1 POST

I have the same truck and it did the same thing.
On mine the problem turned out to be the engine temperature sending unit, located on the intake manifold. The signal from the faulty unit was causing the computer (ECM) to make extreme adjustments to the fuel / air mixture and injector operation. I often pressure wash my engines. I believe moisture damaged the unit.
It's a cheap part and easy to replace.
Good Luck.