Sometimes when I try to start my car (93 del sol,d16z6) the fuel pump doesn't prime and the car wont start. This only happens sometimes. I've tested the wires at the main relay with a test light. The YEL/WHT, YEL/BLK, and BLK/YEL wires all have power with the key in the "run" position. The BLK, BLU/WHT, and YEL/GRN wires don't have any power with the key in the "run" position. What gets me is the last wire GRN/YEL. When I test it, the fuel pump comes on and the test light lights up dimly. Is this a ground issue? The thermostat ground point is clean. Or is it a signal wire to the relay issue? Not sure which wire that one is.
Yeah that old thread was mine. I have the same car 93 del sol si D16Z6.
I chased that problem for a year. I had changed fuel pumps, ignition switch, main relay, cleaned grounds etc. Turned out it was the ECU. Water/ condensation damage. It would start intermittently especially after a overnight rain. Eventually it wouldn't start at all. I got a junkyard P28 ECU for about $130. Fixed it been good for the last 6 months.
The Ecu was 18 years old. Car had 190K miles.
So could be the ecu?
As for main relay, this is the second replacement I've gotten. When the car first started doing this I immediately thought it was the main relay. So I warranted it and it still had the same problem.
I haven't sanded the ground point, but it's already shiny so I didn't think it would help.
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