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Old 05-12-2010, 09:19 AM   #1
killa996
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Default 02 Wrx Hard Start When Cold!!!

Hey I have a 02 wrx. It has a xtp stage 2 map and a full exhaust. Ive been recently getting this problem in the mornings when my car is cold. When i try to start the car it seems like its fumbling and the car dosent want to start. I have to try about 2 to 3 times and give it some gas for the car to finaly start. but after a while when the car is warm it will start just fine. Only after the car sits for a while. Ive also recently installed a killswitch that connects to main relay (under passenger footboard). Im not sure if that has anything to do with it. I changed my air filter and spark plugs last night and im still getting the problem. Any ideas??? lol


Thanks,
Danny
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Old 05-12-2010, 09:27 AM   #2
02wrx-sti-man
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Is the battery slowly dying?
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Old 05-12-2010, 09:39 AM   #3
killa996
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My battery terminal is alittle corroded. Is there more strain on the battery when the car is cold? To start the car in the morning I have to give it some gas. Ill test it with my voltmeter when I get out of work.
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Old 05-12-2010, 10:25 AM   #4
wrxkid950
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when its cold out the batt doesnt put out as much power as it doesn when its warm. so that along with the corroded terminals could be causing a lack of power to ur starter. try cleaning up ther terminal and see if that works
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Old 05-12-2010, 10:38 AM   #5
WhyHelloOfficer
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Colder temperatures slow the chemical reaction in a battery which creates the cranking amps needed to start the car. Typically the cranking amps will be higher when underhood temperatures are higher. I would check the voltage on the battery and replace it if necessary.

Double checking all of your grounds and cleaning the battery terminals of corosion will also help with conductivity.
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Old 05-12-2010, 12:29 PM   #6
soobaviator
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What temperatures are you talking about? What oil are you using? Is there any way possible that your kill switch job has created some slow discharge condition on the electrical system?

-soobaviator
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Old 05-12-2010, 04:55 PM   #7
killa996
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hey i did the killswitch from this thread. http://forums.nasioc.com/forums/showthread.php?t=96894

Connected it to the cruse control button and the main relday not the fuel pump. There were acouple of times when i forgot to turn on my cruse button and the car would just crank and not start. Could i have damaged something by having the main relay off while im trying to start the car? I am going to check my voltage. What should be a normal voltage readout? temps are in the 40s at night here in nyc. i am using amsoil SAE 5W-30 Synthetic Motor Oil.


can it be my idle air control valve??
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Old 05-19-2010, 12:43 PM   #8
killa996
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Ok so this is my update.

I changed my battery.
I changed my positive batery terminal.
I changed my air filter.
I changed my spark plugs.
I changed my fuel filter.
I changed my idle air control valve gasket and cleaned it.


Im still getting this problem when trying to start the car. Any other ideas?
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Old 05-19-2010, 03:02 PM   #9
oguitar
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Quote:
Originally Posted by killa996 View Post
hey i did the killswitch from this thread. http://forums.nasioc.com/forums/showthread.php?t=96894

Connected it to the cruse control button and the main relday not the fuel pump. There were acouple of times when i forgot to turn on my cruse button and the car would just crank and not start. Could i have damaged something by having the main relay off while im trying to start the car? I am going to check my voltage. What should be a normal voltage readout? temps are in the 40s at night here in nyc. i am using amsoil SAE 5W-30 Synthetic Motor Oil.


can it be my idle air control valve??
I say undo this mod and stay away from your electrical wiring.
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Old 05-20-2010, 12:13 PM   #10
killa996
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Should I try to change my CRANK sensor?
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Old 05-20-2010, 01:26 PM   #11
yarrgh
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Quote:
Originally Posted by killa996 View Post
Should I try to change my CRANK sensor?
no, undo that mod, and stay away from electrical changes to your car.
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Old 05-20-2010, 01:40 PM   #12
Rocky WRX
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I doubt that the killswitch mod is the problem, since it had been working fine for a month, but you could verify that by re-connecting the black wire from the main relay connector, the one that you cut to insert the killswitch relay.

Do you have a set of service manuals? I don't have mine handy at the moment, but they have some pretty detailed troubleshooting trees that should cover this problem.
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Old 05-20-2010, 02:01 PM   #13
killa996
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ok im gonna remove the killswitch to see what happens.
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Old 05-20-2010, 06:22 PM   #14
subeb
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there is a recall on your year. there is a leak in the fuel delivery system somewhere under the intake manifold. i have an 03' and got a letter in the mail about it a few months back. check it out... free work from the dealer.
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Old 05-23-2010, 02:27 AM   #15
SDgoods
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too thick of oil can affect cold starting. It thins out when it gets hot, and it starts fine...
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Old 08-01-2014, 10:38 AM   #16
adiabatic
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Quote:
Originally Posted by subeb View Post
there is a recall on your year. there is a leak in the fuel delivery system somewhere under the intake manifold. i have an 03' and got a letter in the mail about it a few months back. check it out... free work from the dealer.
Would an ever-so-slight leak on one of the rubber fuel hoses under the intake manifold cause cold start problems?
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