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rain kills my 93 civic

Old 03-03-2014, 06:09 AM
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Join Date: Mar 2014
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Exclamation rain kills my 93 civic

4 months ago it rained and my 93 honda would not start. I replaced everything i could, And still nothing. A mechanic came to look at it, and did somthing by the fuse box inside the engine. And finally I heard the click that is the fuel pump finally getting its ground and sending fuel. He also said that the injectors were not getting pulse, so this is why it still would not start when i sent the pump 12v plus a ground. Well since then its been running fine. immaculate actually. and two days ago it rained again. and nothing. Ive pulled fuses. battery cables, checked all the fuses, and every forum i find seems to offer nothing to get these hondas started in this predicament. its always the same thing, and ive tried everything. who knows where that mechanic is now, but one thing he told me when i asked him how he did that was, that he has 40 years experience. so, aside that this guy is a freaking control freak, jerk, what could he possibly have done that i havent allready done 30 times, trying to get this thing to start. Oh and another thing, this time its been under a covered parking, so the car is totally dry. seems somthing triggers this casr when it gets humid to not send the ground from the computer. and it has to be manually reset. vbut it also seems no one really knows what this problem is, and bottom line, car wont start. no voltage to the pump or the injectors. and it just cranks and wears down the battery. lame. anyone have any ideas?? ive lost my head in this one.
Old 03-03-2014, 06:45 AM
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Join Date: Jun 2007
Posts: 10,023

The car has power (lights, radio, starter, lights on the dash, etc., right?). And it cranks but won't start, because the fuel pump doesn't come on.

OK this sounds like the main relay, which is a well known problem. Before you even think about anything else, do this:


If, after knowing the relay is OK, you still have main relay symptoms (CEL comes on stays on when you turn the key on but don't crank, and the fuel pump never starts), the ECU may be bad. There have been a few people here with ECUs that were slow to "boot up". In that case sometimes the ECU would eventually start running after leaving the key on for a very long time (several minutes). Then the CEL would go out, and the engine could be started. The cure for this is to replace the ECU. But do that only after checking all other possibilities.

I doubt that this has anything to do with rain or moisture. That is what scientists call a "coincidence".
Old 03-03-2014, 12:18 PM
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Join Date: Jun 2008
Posts: 184
Default +1 on main relay

I had the same symptoms on my 93. As MK said, I can't imagine how a cold solder joint would be moisture related, but the fix was a reflow. Has rained a bunch since the fix. Oh, and it will get worse and start failing other times than when raining....
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