replaced fuel pump, has good pressure, truck backfires and won't start.
Dec 10, 2021 at 5:41 AM
truck backfires and will not start
1998 CHEVROLET SILVERADO
GHAYES988
- MEMBER
- 1 POST
Advertisement
Hi,
Did this happen all at once? Have you confirmed the fuel pressure is within the manufacturer's specs? If it's too high due to a faulty fuel pressure regulator, that can cause backfiring. Also, a very lean fuel mixture can do the same.
Take a look through this link first and let me know if anything helps:
https://www.2carpros.com/articles/engine-backfires-while-running
Also, try disconnecting the MAF sensor and see if it starts. (See pic 1 for location)
Let me know what you find.
Joe
See pic below.
Did this happen all at once? Have you confirmed the fuel pressure is within the manufacturer's specs? If it's too high due to a faulty fuel pressure regulator, that can cause backfiring. Also, a very lean fuel mixture can do the same.
Take a look through this link first and let me know if anything helps:
https://www.2carpros.com/articles/engine-backfires-while-running
Also, try disconnecting the MAF sensor and see if it starts. (See pic 1 for location)
Let me know what you find.
Joe
See pic below.
Image (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Click here to log in and view diagram.
Dec 10, 2021 at 12:49 PM
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.