Will not start

1995 CHEVROLET SILVERADO
189,000 MILES • 5.7L • V8 • 2WD • AUTOMATIC
Avatar
DEREK HERNANDEZ
  • MEMBER
  • 1 POST
I put new fuel pump in, getting fuel now all the way to the intake but, still no start. if i put gas direct in the throttle body starts just fine, but will only run till that gas burns out.
Nov 22, 2021 at 4:37 PM
Advertisement
Avatar
JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,240 POSTS
Hi,

It sounds like you lost power to the fuel injectors. Power is supplied to them via the ECM 1 fuse. Check that fuse first. It is located in the under-hood fuse box. See pic 3 below. Note: The legend doesn't provide a fuse number, but rather, pin identification. I believe I highlighted the correct fuse, but please confirm that with the label under the cover of the box.

When you check the fuse, also confirm there is power to it. Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If the fuse is good, then I need you to go to the injectors. There will be a pink wire going to each of the two injectors. These pink wires should have power (12v) when the key is on or in the start position. Check for power. The ground required to complete the circuit is provided by the ECM. So, if you have power, you may want to check for ground.

As far as the ground, disconnect one of the injectors. Place a test lamp between the two connector pins (pink wire and dark blue) and have someone crank the engine. The light should strobe on and off or could simply be dim or bright based on the throttle position sensor.

If you look below, I attached the wiring schematic for the injectors. I highlighted the wiring related to the circuit and the fuse. I had to cut the pic in half to make it readable for you, but I did overlap them so you can follow from one to the next. Here is a link you may find helpful when testing wiring.

https://www.2carpros.com/articles/how-to-check-wiring

Let me know what you find or if you have other questions.

Take care,

Joe

See pics below.

Nov 23, 2021 at 12:10 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.