I drive a 94 civic with the stock D15B7 and yesterday it rained alot here in Phoenix. Well after work my car wouldn't start. I was practically on E so I poured a couple galons of fuel into the tank, but it still wouldn't start. so then I pulled a spark plug wire to check for spark. It was weak but still sparked nonetheless. So I figured fuel might not be getting to the engine, I tried cranking while spraying some starting fluid, still no go. When I was reattaching the intake tube to the tb I disconnected the Map sensor and reconnected it. after that it started but sputtered really bad. so we jiggled the map sensor and finally it fired right up. So my question is: Can a map sensor be so adversely affected by humidity/moisture that it prevents a car from starting? I don't have a CAI, just a short ram. Is my Map going bad or are all map sensors this finicky when it comes to wet weather?

 

Your problems sound more like a distributor cap sealing issue. I'd swap out caps and make sure you have a good seal on it. When any kind of moisture gets in there you'll get the symptoms you're describing.

 

Now that you mention it. I did look inside the distributor and isn't there supposed to be a rubber gasket it sits on? Mine didn't have it, and when I held the cap in place while someone cranked the car over I got Shocked! I half expected that. But yeah I think my problem is the distributor cap gasket missing.

 

Yeah, you need that rubber gasket seal. Good luck with this.