Shuts off while driving and will not restart immediately?

MSPRAYBE

MEMBER
2003 CHEVROLET SILVERADO
4.8L
V8
2WD
AUTOMATIC
250,000 MILES

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.

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,716 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 make bigger)