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Riddle me this...what do the radiator fan, ect, cold start, and radio interference have in common? 900 1993

posted by  fullfathom on  Sun Nov 14 15:40 CST 2004
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93 940 Turbo/ 224k...

All signs seem to be pointing towards a bad ECU, but I want to be sure. The problems are cold start (cranks and sparks, but little fuel), cooling fan runs full-time, and am now hearing the fuel injector signals thru my radio. Each "pop" on the tuner coresponds to a stumble at the injectors. This consequently goes away when the ambient temp is warmer. The engine temp doesn't seem to matter.

I am getting a 123 code for the ECT. I replaced it with no change. I am getting over 6 volts (with car on) when I check it at the ECU connection in the foot well. I heard it shouldn't be more than 5. Also replaced the FPR, FIR (radio suppression), dist. cap/ rotor, and main fuel pump.

Is there a good way to test my ECU? It's a Jetronic 937, which I have seen very little info on in here.






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New Riddle me this...what do the radiator fan, ect, cold start, and radio interference have in common? [900][1993]
posted by  fullfathom  on Sun Nov 14 15:40 CST 2004 >


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