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740 no start

posted by  woodchuck on  Fri Dec 10 14:30 CST 2010
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last visit: Fri Feb 21 12:21 CST 2014
[RELATED]

my fine running 1990 740 regina won't start. no symptoms. just refuses to fire. i decided to replace all the usual suspects, fuel pump relay, crank sensor, and radio suppression relay. no joy. the plugs are dry so it is a fuel problem. i am quite sure i hear the fuel pump run when i switch the ignition. my ears are not the best. the FAQS are leading me to question the ECU. apparently the L2.4 ECUs are failure prone, good for about 15 yrs before fuel pump circuit craps out. how do i tell which ECU i have. i have the number but am not really sure what it tells me. one of the confusing details is the car's regina system. the ECU is bendix not bosch.

to further complicate matters, the volvo fix for cold injector problems back in 1990 has left me with a permanent 321 code on the fuel side of the obd. so no help from obd.

any ideas?






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