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Random Misfire, 1993 240 200

posted by  graymatta on  Tue Mar 10 07:59 CST 2015
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last visit: Thu Dec 15 12:42 CST 2011
[RELATED]

So another bit of fun. We're approaching 500k on the 240 and I suppose odd problems are to be expected. Today's adventure appears to be ignition related. Smooth running EXCEPT for the occasional stumble.

New:

COIL - BOSCH OEM
COIL harness spade connectors
CAP
ROTOR
POWER STAGE - BOSCH OEM
PLUG WIRES
PLUGS - NGK BPR6ES

When she's running at highway speed, it's just super smooth EXCEPT for what feels like random misfire, which can cluster or go for a few minutes without manifesting.

No lag or symptoms of fuel delivery issues.

No codes.

No correlation between heat/humidity and missing.

No worsening under load, but you do notice it more because the miss hits when you're needing acceleration.

Ideas?


--
~graymatta '93 240, '92 940, (departed) '85 740 and a world of air-cooled VWs in my past






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