'87 260E....no start problem. just replaced Idle control valve, idled o.k, but had minor intermittent surge-about 150-200rpm. saw evidence of someone having played with 3mm air metering valve, ( actual crude cut vertically about 5mm long from top downwards) so tried to adjust in 1/4 turn increments. while adjusting, motor stopped. tried to re-start, but no go. after several tries, checked plugs for spark-there, but yellow. removed plugs & found lots of fuel. cleaned plugs, but still no run. any help/direction is appreciated. is there a crank sensor on this engine?