8 ford ranger 4.0 v6 Truck idles rough

1998 FORD RANGER
130,000 MILES
Avatar
BADMECHANIC2
  • MEMBER
  • 3 POSTS
4.0 v6 hesitates and surges when accelerating and rough idle. Hsa new plugs, wires, camshaft sensor, crankshaft sensor, ignition coil, egr valve. mechanic did fuel pressure test and vacuum test and its o.k. No light and when it had aq light code was po 309.
Apr 15, 2012 at 9:04 PM
Advertisement
Avatar
ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
i would start with a compression test first. i would also smoke the intake system looking for vacuum leaks that would do this.

Roy
Apr 15, 2012 at 9:05 PM
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 Free Question
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.