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Old 11-25-2002, 01:43 PM
stevebfl stevebfl is offline
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
You will need to do some forms of testing to get results. Does the car drive properly at 40mph? Does it accelerate well from that speed?

I would bump the timing to 15 deg BTDC (with the vacuum lines disconnected), at least till we have fixed the problem. The factory set-up is based upon having vacuum on the retard side of the distributor - many causes for this setting the timing too low: no vacuum, low vacuum, A/C on (no vacuum), vacuum retard unit leaking, corroded, malfunctioning, etc.

Once in this condition, determine if there is a single cylinder misfire or are all cylinders equally poor running. Effective cylinder balance testing can be done by cracking the injection lines loose one at a time (wipe spilled gas - be carefull) while noticing the difference in speed and vibration. Cylinders that are poor will give little if any change. This same test can be done by pulling plug wires. I personally would rather deal with the fuel than the spark.

Let us know what you find.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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