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1980 242 B-21F Weird Semi No-Start 200 1980

posted by  yellowbrickroadster on  Mon Sep 1 01:02 CST 2003
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last visit: Wed Oct 22 06:18 CST 2014
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Hi Gang,

Here's the basics, 1980 242 DL, w/B21-F K-jet. Car has been running flawlessly. Parked it Saturday night. Sunday morning it cranks, fires, then dies immediately. Successive crankings give nothing. After sitting for about 30 minutes, it fires up, and as long as I keep it at 2000 rpm and above, it will continue running. If it drops below 2000 rpm or so, it dies. Then if I try to restart it after running, it just cranks. Again, after sitting for 20-30 minutes, it will fire up again, but will die if I take my foot off the throtle and let the rpms drop below 2000. Fuel pump is running when it is cranking.

I don't think it is ignition, since it fires up initially. Obviously fuel is not a problem since the pump runs and it fires up initially. Could it be the fuel distributor ? Thinking is that the cold start injector gives it enough gas to start and create vaccum to lift the pressure plate and keep it running at higher rpms, but if the rpms drop, then not enough pressure in the fuel distributor to supply fuel to injectors so it all shuts down ?

No apparent vaccum leaks, all new hoses. Also, in the past 8 months have put in new control pressure regulator, thermal time switch, intake manifold gasket, injectors and seals, plugs, cap, rotor, wires, wiring harness.

Appreciate guidance and advice on possible sources of problem or what to check next.

Thanks.

Mike






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