Shuts off while driving and will not restart immediately?

2003 CHEVROLET SILVERADO

250,000 MILES • 4.8L • V8 • 2WD • AUTOMATIC

MSPRAYBE

MEMBER
2 POSTS

While driving down the road the truck stalls and quits. I tried to restart it and it sounded like it was trying but wouldn't actually start. After pushing it out of the road and it is sitting for about a 10–15-minute time I tried cranking it again and it started but stalled out and died about 30 seconds later. And it is now starting but keeps stalling out after a few minutes of driving.

Jan 23, 2024 at 6:12 AM

JACOBANDNICKOLAS

✓Experienced Mechanic
110,240 POSTS

Hi,

This type of issue can be a few things. Most likely, either the crankshaft position sensor is failing, or we have low fuel pressure.

First, take a look through this link and let me know if you feel it mirrors what you are experiencing:

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

If not, then my next suggestion would be to check the fuel pressure to make sure it is within the manufacturer's specifications.

Here is a link that explains how to check the pressure:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

To check the pressure, you will need a fuel pressure gauge. Most parts stores will lend one to you.

I attached the manufacturer's fuel pressure specifications below. Note: The 8th digit of the VIN is the engine code. It will be either a Z or something other. Take note of the pressures based on the VIN engine code.

Let me know your thoughts and if you have other questions,

Take care,

Joe

See pic below.

Image (Click to enlarge)

Professional Diagram for 2CarPros Members
Click here to log in and view diagram.

Jan 23, 2024 at 12:17 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.