8 4.0 V6 TRUCK IDLES ROUGH

1998 Ford Ranger

Tiny

badmechanic2

April, 15, 2012 AT 9:04 PM

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.

FOUND 4561 RELATED QUESTIONS

Running Rough

27 ANSWERS
34 IMAGES

Idles Rough/changed Ects

37 ANSWERS
3 IMAGES

1 Answer

Tiny

ASEMaster6371

April, 15, 2012 AT 9:05 PM

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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