1989 Chevrolet Truck Engine Hesitation

1989 CHEVROLET TRUCK
5.7L • V8 • 2WD • AUTOMATIC
Avatar
CFHIV
  • MEMBER
  • 2 POSTS
My engine cranks long before igniting when cold and hesitates or stumbles during acceleration. I have changed the fuel filter. I have been told by a friend to look at the MAP sensor and throttle position sensor. I don't know what to do before spending money. I would like to do a fuel pressure test but I can't find an illustration showing me where to do it. I am having trouble troubleshooting this. It has stalled twice after a hot start up.
Jun 28, 2014 at 8:55 AM
Advertisement
Avatar
HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
fuel pressure you need an adapter to do it autoparts rent the gauge but may or may not have adapters. yours shold be 9-11 psi. but check vacuum hose leading to map, and check base of tbi unit for a blown gasket that is a common problem. squirt choke cleaner around it if it smooths out you found it. if check engine light is on scan for codes.
Jun 28, 2014 at 9:09 AM
Avatar
CFHIV
  • MEMBER
  • 2 POSTS
Ok, thank you, but where do I attach the gauge to check fuel pressure? I don't have a schrader valve.
Jun 28, 2014 at 9:22 AM
Avatar
HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
that is what the adapter is for you unscrew fuel line then screw adapter into it or however it hooks up
Jun 28, 2014 at 9:30 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
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 new question

Frequently Asked Problems for This Vehicle