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Old 08-21-2011, 02:48 PM   #1
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Icon3 My car won't start after it rains

My car won't start after it rains i put the key in and turn, usually i can hear the fuel pump turn on the the check engine light turns off then the car starts. But after it rains or on very humid days i turn the key and the fuel pump will not turn and the check engine light stays on and the car will turn over but won't start. I have to wait any where from 5-30 mins then the fuel pump turns on and the check engine light goes off and the car starts. On hot days no problem car starts right up! I've looked everywhere can someone please help me! Thanks a lot!
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Old 08-21-2011, 04:08 PM   #2
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Default Re: My car won't start after it rains

most likely in the ignition system. have you had a tune up recently including distributor cap? have you inspected the ignition coil for cracks?
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Old 08-21-2011, 04:17 PM   #3
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Default Re: My car won't start after it rains

Check teh distributor cap for moisture?
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Old 08-21-2011, 04:29 PM   #4
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Default Re: My car won't start after it rains

check your main relay
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Old 08-21-2011, 06:11 PM   #5
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Default Re: My car won't start after it rains

Used to happen to me, crack in the distributor cap and when water got in spark went out. Take a look at the cap and maybe replace it.
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Old 08-22-2011, 04:53 AM   #6
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Default Re: My car won't start after it rains

I had that problem with a 93 del sol and chased it for a year. I did fuel pump, main relay, ground wires on thermostat housing, ignition switch, etc. Turned out to be the ECU. Moisture got to it. The clue was the top of the ECU was covered with moisture corrosion on the case.
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Old 08-22-2011, 09:07 AM   #7
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Default Re: My car won't start after it rains

It is helpful to put what your car is.

I would do cap rotor and wires.
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Old 08-22-2011, 01:14 PM   #8
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Default Re: My car won't start after it rains

What car?

A bad distributor would not prevent the fuel pump from priming. Start by resoldering the main relay:

http://techauto.awardspace.com/mainrelay.html

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Old 08-22-2011, 01:24 PM   #9
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Default Re: My car won't start after it rains

had this same problem in my 93 coupe.. it was my main relay, changed it and never had the problem again.
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Old 08-22-2011, 02:13 PM   #10
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Default Re: My car won't start after it rains

Could be distributor cap or water getting into a relay.
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Old 08-28-2011, 05:28 PM   #11
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Default Re: My car won't start after it rains

Sorry guys its 94 honda civic ex with a d16y8 swap. the car is getting spark. the only way i know how to deal with it is to put the key in and turn till everything in on then walk away then in 10-15 mins when the check engine light goes off everything is fine! i checked for codes it has none. and the ecu has no sign of water damage from the outside. i already check the dizzy and the main relay i'm want to kill it lol please anything can help
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Old 08-28-2011, 05:30 PM   #12
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Default Re: My car won't start after it rains

When the CEL turns on steady, leave the engine running while you jump the service connector to pull the CEL codes.
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Old 08-28-2011, 05:34 PM   #13
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Default Re: My car won't start after it rains

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What car?

A bad distributor would not prevent the fuel pump from priming. Start by resoldering the main relay:
I was thinking the same thing. If the fuel pump is not priming. First place I would go is the main relay.
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Old 08-28-2011, 05:41 PM   #14
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Default Re: My car won't start after it rains

Quote:
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I was thinking the same thing. If the fuel pump is not priming. First place I would go is the main relay.
the engine dont throw now check engine codes and the main has been change twice thinking i got a bad one i take back about what i say about the ecu i never checked that yet!
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Old 08-28-2011, 05:43 PM   #15
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Default Re: My car won't start after it rains

and for ***** and giggles how do you go about resolding the main relay?
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Old 08-28-2011, 05:52 PM   #16
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Default Re: My car won't start after it rains

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and for ***** and giggles how do you go about resolding the main relay?
Why don't you read posts in your thread?
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Old 07-08-2013, 03:47 PM   #17
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Default Re: My car won't start after it rains

Hey I have this same issue , I changed my main relay twice but still it just fires up for second and then it dies . I have spark and it has a new fuel pump and the fuel pump does turn on .
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