8 Ford Ranger 4.0 V6 Truck idles rough

Tiny
BADMECHANIC2
  • 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.

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Sunday, April 15th, 2012 AT 9:04 PM

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Tiny
ASEMASTER6371
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  • 25,554 POSTS

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

Roy

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Sunday, April 15th, 2012 AT 9:05 PM

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