SPONSORED LINKS

Will not stay running?

Tiny
ORTEGAEDDIE
  • MEMBER
  • 1994 GMC SONOMA
  • V6
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
I have the truck listed above that has complete engine rebuild, new MAP, new distributor, new ignition switch, all new sensors, new fuel pump, new fuel filter. Basically I have replaced everything on this truck and I cannot get it to stay idling. It starts beautiful and idles for about one minute and shuts off and each time I start it, it will stay on less. I have checked for codes and it is not throwing any codes. I am at a loss, don't know what else to check. Any help would be greatly appreciated.
Video (Click to make bigger)
Thumb
SPONSORED LINKS
Saturday, July 3rd, 2021 AT 10:53 PM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

I would start by testing the fuel pressure. Make sure it is within specs. I post the specs below for you. You can rent a tester at a parts store.

https://www.2carpros.com/articles/stall-at-idle

For the CPI or central system

Fuel Pressure Specification:

With the ignition ON & fuel pump running .................... 380 - 420 kPa (55 - 61 psi)

For the system that has a throttle body

Fuel Pressure Specification:

Ignition ON & fuel pump running .................... 62 - 90 kPa (9 - 13 psi)

It does sound like the fuel pump is the issue but needs to be confirmed.

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

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Roy
Images (Click to make bigger)
Thumb
Thumb
Thumb
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
+1
Sunday, July 4th, 2021 AT 2:14 AM
Tiny
ORTEGAEDDIE
  • MEMBER
  • 3 POSTS
Thank you so much. We did test that first. Fuel pressure is good. Any other ideas?
Was this
answer
helpful?
Yes
No
Sunday, July 4th, 2021 AT 4:14 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
What is the pressure?

Roy
Was this
answer
helpful?
Yes
No
+1
Sunday, July 4th, 2021 AT 5:38 PM
Tiny
ORTEGAEDDIE
  • MEMBER
  • 3 POSTS
Last test was 55-61 (when you first start the truck it goes up to 70 then regulates anywhere between 55-61 never below 55).
Was this
answer
helpful?
Yes
No
Sunday, July 4th, 2021 AT 5:49 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
When it stalls, does the pressure remain at 55? Want to make sure it is not falling off.

Roy
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Monday, July 5th, 2021 AT 2:37 AM

Please login or register to post a reply.

Related Engine Stall While Driving Content

Is it Safe to Drive Check Engine Light?
VIDEO
Is it Safe to Drive Check Engine Light?
Instructional repair video
Engine Stalls While Driving
GUIDE
Engine Stalls While Driving
An engine that stalls while driving and then starts back up again, either immediately or after a short time is different from an engine that just wont start or if the...
VIEW MORE

Sponsored links