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Discussion Starter · #1 ·
Good day folks,

My 88 CRX will turn over but won't start. Was intermitent last week so I changed out the main relay and she ran fine for a couple of days. Wife brought it home the other day saying it ran great. Went to start it today and won't. Have diagnosed down to blown ECM fuse. Put in spare and tried to start, blew it again.

Any ideas?

Thanks
 

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Discussion Starter · #3 ·
I traced what I think is the problem to the fuel guage. If I leave it unplugged at the tank the ECM fuse does not blow and the pump runs fine and the car starts. I am only getting 7.5 volts at the fule guage plug at the tank. The manual states that I should have battery voltage (12volts). i can only assume that with the lower voltage there must be some increased resistance and thus blowing the ECM fuse through the Main Relay. I am going to check the grounds and see if they are good for the fuel guage. If this makes any sense. I will continue to diagnose further and let you know.

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dougan said:
I traced what I think is the problem to the fuel guage. If I leave it unplugged at the tank the ECM fuse does not blow and the pump runs fine and the car starts. I am only getting 7.5 volts at the fule guage plug at the tank. The manual states that I should have battery voltage (12volts). i can only assume that with the lower voltage there must be some increased resistance and thus blowing the ECM fuse through the Main Relay. I am going to check the grounds and see if they are good for the fuel guage. If this makes any sense. I will continue to diagnose further and let you know.
Increased resistance shouldn't blow a fuse.

There's a longish general autorepair faq I found that describes something similar, drop in voltage due to a rotten wire. But I bet you've got short.
 
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