In my continual effort to get my '84 245 running properly, have been trying to set the base idle/mixture as per the Bentley book. On my first attempt, I attached a dwell meter with the green lead to the pink test lead and black to ground and I got nothing. I decided to replace the O2 sensor(badly needed and gave night and day difference in driveability!), but after a long drive to get the car fully warm, I still have nothing at the pink lead. I turned the CO adjustment screw up to 5 turns in each direction with no change. I have even tried two dwell meters and I have the same results each time. Am I missing something? Has anyone had a similar experience? Any thoughts? If it helps, I have the 510 ecu and the AMM is an older rebuilt unit. Other symptoms the car has are an elevated idle (between 1000 and 1100) and higher than normal running temp, if that helps at all.
Thanks,
Nick

Problem may be with the continuity between the pink test point and the CPU.

Pull the plug on the CPU and test the circuit between the CPU plug and the test point.

Regards,

Tatra Mike
San Diego, California

1985 244 "Alfsen" (the first - the flagship)
1984 245 "Buster" (with the relatives in Seattle}
1985 245 "Cosmo" (enjoying retirement in the side yard)
1985 245 "Daisy" (back seat down, full of tools, the work truck)
1985 245 "Earl (hoozah, another stick shift!)

I have used that test point many times on both 240 and 740 to "tweek" the mixture. I always used a test light or ordinary meter, not sure how a dwell meter would work. What I looked for was a fluctuation between 12V and ground with about equal time on each by adjusting the screw on the MAF.
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David Hunter