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Old 09-05-2010, 12:49 PM   #1
kyle-vick
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STM

Default PLEASE HELP! Fast Flashing CEL after going through water hole.

2000 2.5RS MT

Alright, so I went through a water hole the other day and got water in on my passenger side floor and everywhere it shouldn't be pretty much. at first the car started running bad and falling on its face, so i shut it off. When I went to turn it back on, the CEL was flashing extremely fast along with the sound of relays clicking under the drivers side dash. I let it sit for a second then tried again, the CEL flashed for a few seconds, like that, fast, then stopped on a solid CEL and started. It ran great, no problems. I went a couple hundred feet with it running great, stopped at a stop sign and turned defog on and off a couple times to defog my windshield and then I noticed it stopped running again and was doing the same thing. It turns over just fine when it is flashing the CEL, its like the ecu just will not let it run. I noticed when I took my ECU out it had two water drops on the silicon board and the whole harness is soaked. It does not seem, from what I have read, to be showing the signs of a bad ECU. I have not read anything like it. The CEL is not like flashing a code, which I have seen some do when there is something really wrong and the ECU is telling it not to run.

Also, If i get a new ECU, will a 99 2.5 RS MT ecu work with it even though the part number is AF582 instead of mine AF584?
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Old 09-05-2010, 01:10 PM   #2
gedwrx
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Have you had a chance to read the code? What is the actual CEL reading as an error.

I would start there and work backwards.
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Old 09-05-2010, 01:53 PM   #3
kyle-vick
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It will not link to read the code, i think because of how fast it is flashing.
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Old 09-05-2010, 02:19 PM   #4
Subyroo2.5
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Ok I flooded my subie too at one time and was experiencing the same issues as you. What happened to my car was the O2 sensors got wet because my exhuast was filled with water. I don't believe my ECU got wet but relays were freakin out and I had really bad driveability issues.........my advice, if your sure your intake didn't suck up and water drive the car on the highway ASAP for as long as u can to get everything dried out. I laid on my back for an hour hosing off the undercarriage, spent about 6 hours shop vaccuming water out of the car. When done with that rip out the sound insulation under the rear foot well. Then go rent the biggest de-humidifier you can find and run it for about 24 hours inside the car emptying the tray every few hours. Do all of this ASAP. I got lucky and didn't damage anything, but pretty sure if I didn't spend all this time cleaning and drying that my car would be ****ed. Let me know if u have any more questions.
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Old 09-05-2010, 02:50 PM   #5
kyle-vick
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Hey thanks for the good advice! the only problem is, my car wont even start. It just rolls over. Or else, I would do exactly that.
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Old 09-05-2010, 03:06 PM   #6
Subyroo2.5
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PuL your battery and re connect to reset the ECU and try to start it.
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Old 09-05-2010, 03:26 PM   #7
kyle-vick
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I have, and as soon as I turn the key forward it does it. Dont even have to try to start it. I did it again tho.
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Old 09-05-2010, 04:15 PM   #8
Subyroo2.5
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Ya sounds like your ECU is bricked. Especially if your saying the check engine light is blinking rapidly.......
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Old 09-05-2010, 07:59 PM   #9
geronimo81
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I also flooded my car a few years back. It did suck water into the motor and broke a rod.

This obviously isn't your problem but did you check the air filter to see if it was wet? That will cause problems. I had a couple inches of water inside my car also but I was told that if I pulled the ecu and put it in an oven at 200 deg F it would dry out. Of course the water that was in my car was very acidic from sagebrush so this didn't exactly work. When I did get the new motor in it ran great for about 10 mins and then went down hill until it wouldn't even start. Replaced the ecu and it was fixed.

Good Luck and I think you cannot use the 99 ecu because that car was MAF based and yours is MAP. If anybody knows better please chime in.

I hope this helps
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Old 09-05-2010, 09:01 PM   #10
kyle-vick
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Yeah, i looked and there was not any water in my engine. I will try getting the ecu out and let it dry out inside. maybe its wetter than it looks. seems dry, but it did have water on it. did yours throw a cel or anything when it wouldnt start?
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Old 09-06-2010, 04:34 PM   #11
kyle-vick
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Pulled the ECU for a second time, and under closer inspection I found corrosion on the biggest chip on the circuit board. I cleaned the corrosion off with a toothbrush, needle, and electronic cleaner. Then, I put it back in, crossed my fingers, and what do you know, It runs great. So, on further note, if you think your ECU may be destroyed or bad, make sure it is clean and dry before you go an spend time and money tracking one down. Sorry for no pictures, I forgot to take them until I after I cleaned it.
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Old 09-06-2010, 10:14 PM   #12
geronimo81
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That is the best result possible. Good job on tracking it down and fixing it. I'm happy for your success!
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Old 09-06-2010, 10:50 PM   #13
SiiD
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Good job man!
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Old 09-07-2010, 12:19 AM   #14
kyle-vick
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Hey thanks guys, I appreciate it.
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Old 09-07-2010, 12:40 AM   #15
Bluefoton
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Good job! How deep was the water you went in? Would be good to see how much can the Subie handle
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Old 09-07-2010, 12:48 AM   #16
kyle-vick
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STM

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It was probably around two or three feet of water. It could do much more trust me, It just needs to be water-proofed ASAP.
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Old 09-07-2010, 10:49 AM   #17
Bluefoton
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now with a HID retrofit

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So the engine bay and drowned headers isn't really a problem... it's the water getting into the passenger compartment and drowning the ECU? hm..
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Old 09-07-2010, 09:27 PM   #18
kyle-vick
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2000 2.5RS
STM

Default

Yeah, deffinally need to make sure your floors are waterproofed before you tear up any water holes. Also, it still isn't great to get water into the engine compartment, unless you have gone through the precautions to waterproof if. This means, prob no cold air intake, and I noticed the fuses are not in a waterproof compartment under the hood. exhaust really should not be an issue, as long as you leave the vehicle running, because it causes back pressure, keeping water from entering the exhaust end.
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Old 09-07-2010, 10:38 PM   #19
Bluefoton
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now with a HID retrofit

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My fist worry would actually be cracking of the headers or block. Also, at least for 4WD vehicles, the differentials also seem to be an issue - rapid cooling opens gaps which suck in water. Then come the sensors, the belts...
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Old 09-07-2010, 10:50 PM   #20
kyle-vick
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STM

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Yeah, your not going to crack a block, but possibly headers. All of your sensors should be water tight, at least everyone I looked at was, along with the harness plugs. If you really wanna find out more about offroading your Subaru, check out DirtyImpreza.com. That's where I primarily spend my time. I have been off roading for a long time, if your worried about all this stuff, you need to know, if your going to go off road, your gonna break crap. Just do some research or find out the hard way like me haha, and you should be fine. But be prepared to have to fix and tweak stuff.
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