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240 no start items not mentioned yet....
1) Do you hear the fuel pump(s) for a second when Key is turned ON? If not, see 3 and 4 below.
2) Ignition is usually reliable, but corroded/oxidized coil primary terminals #1 and/or #15 will kill it. The rest should be OK, from all you've replaced (except the RPM sensor, as mentioned by others). By design, an Ignition problem will prevent Fuel operation.
3) If you can verify spark at the plugs, go to the Fuel Injection relay on firewall above passenger's toes. Hold it and turn the key to ON (not start/crank). You should feel.hear it click whenever the key is turned ON. This is the FI System relay (the Fuel relay is also in there, but not active till cranking).
4) If no System relay click, check the 25 amp blade fuse near rhe coil. Even if it looks good, inspect the holder contacts and wiring, all the way to Battery +.
5) If it does click with Key ON, see if it clicks a 2nd time when cranking (Fuel relay). If no 2nd click, suspect the relay, or ECU is failing to energize it.
6) If no Fuel relay click, bypass it (and the 25 amp fuse) with a jumper wire from the Left side of fuse #6 to the Left side of fuse #4. Pumps will run immediately—try starting and let us know what happens.
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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