Mechanics

8 4.0 V6 130,000 MILES. TRUCK IDLES ROUGH, HESITATES WHEN ACCELERATESOR SURGES. IT HASD NEW PLUGS WIRES, EGR VALVE,CRANKSHAFT SENSOR,CAMSHAFT SENSOR, IGNITION COIL. MECHANIC DID DIAGNOSTIC,FUEL PRESSURE TEST, VACUUM TEST. NO ENGINE LIGHT ON NO

1998 Ford Ranger • 130,000 miles

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.
Avatar
Badmechanic2
April 15, 2012.




I would start with a compression test first. I would also smoke the intake system looking for vacuum leaks that would do this.

Roy

ASEMaster6371
Apr 15, 2012.


AD