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240 No Start Problem AGAIN - Help 200 1989

uid 18083's pic
posted by  lucid on  Tue Mar 9 08:51 CST 2010
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

The only known failure mode for that ECU is in grounding the Fuel relay coil to energize it for cranking and running. I don't believe that failure is known to be an intermittent fault.

But to eliminate the possibility, you can substitute for the ECU grounding function by "back-probing" (like you did at AMM Orange) with a grounded test wire at the fuel relay harness plug's Blue/Green wire.

The pumps should run as soon as the Key is On.

If it starts with the ground jumper in place, the ECU is suspect.

--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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