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245 severe hesitation, misfire, rough idle SOLVED 200 1989

posted by  dinomartino on  Wed Apr 14 11:08 CST 2010
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last visit: Fri Oct 24 04:43 CST 2014
[RELATED]

My 245 is finally back on the road, after a maddening 6 months attempting to diagnose a severe off-idle hesitation and an intermittently rough idle. See the old thread:
http://www.brickboard.com/RWD/volvo/1376979/220/240/260/280/offidle_hesitation_rough_idle_misfire.html

Turned out to be something very simple: mis-adjusted valves. The machinist who refurbed the head last July apparently was confused or made a serious math error when he readjusted the valves. Since the machinist does lots of Volvos and has done work for my mechanic for many years, I trusted that he'd done the valves correctly. I spent many hours looking for faults in my own work and for faults in the fuel and ignition systems.

The odd vacuum readings I noted in my initial post did indeed point precisely at what was really wrong.

John






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