Mitsubish Lancer Evolution Forum - EvoTuners.net

Darwin's 8 · 02-16-2007, 04:17 PM

Alright... I got home today and out of nowhere, my Service Engine Soon and Antilock lights both came on. Nothing felt wrong while I was driving home. This of course worries me.

Does anyone have any suggestions about what I should do or any ideas of what causes that kind of warning?

Warrtalon · 02-16-2007, 04:55 PM

First, go to Advanced Auto and read the code(s) to see what it says.

I'll try to find out what can cause the ABS light to come on in the meantime.

Fourdoor · 02-17-2007, 05:07 AM

Snow buildup in the wheels can screw with the wheel speed sensor and mess with the ABS. Have you had a lot of snow in your area lately? We sure have had a lot of snow here in Indiana! If it is not a wheel speed sensor issue, then I am not sure what the cause would be.

Keith

Darwin's 8 · 02-17-2007, 11:09 AM

I went to Advanced Auto to get the code and here's what it said.

P0304
Cylinder 4
Misfire Detected

The guy who worked there said it might be a spark plug issue. Does that sound right to anyone? I would think I'd notice difference in performance. I think I'm taking it to Mile High Mitsubishi on monday to see what they say.

Thanks for the advice. It's much appreciated

Darwin's 8 · 02-17-2007, 11:19 AM

Quote:

Originally Posted by Fourdoor

Snow buildup in the wheels can screw with the wheel speed sensor and mess with the ABS. Have you had a lot of snow in your area lately? We sure have had a lot of snow here in Indiana! If it is not a wheel speed sensor issue, then I am not sure what the cause would be.

Keith

Yes we have been getting a ton of snow but not in the last couple of weeks. I've cleaned the car since so there's no build up. I'm also noticing that the Antilock light only comes on while it parked.

Warrtalon · 02-17-2007, 01:06 PM

Only while parked or only while the e-brake is in use? It could be the e-brake.

We don't get codes for spark plug misfires. p0300 and p0304 are very common codes that we get on Evos all the time. Sometimes, you just can't get rid of it. Did Advanced Auto clear the code for you, or is it still there? If it's still there, reset the battery and see if it comes back. This isn't an indication of an actual problem that needs to be fixed USUALLY.

Fourdoor · 02-17-2007, 03:18 PM

Yeah, the brake light comes on when the parking brake is engaged... perfectly normal.

If the light comes on while you are accelerationg hard, then your fluid level is low. A low fluid level can mean lots of break pad wear. When the pads are worn down the brake caliper pistons are extended more when "at rest" result in more fluid in the brake lines instead of in the resirvour and give the low level indication and the light when the fluid "sloshes" a bit durring acceleration. If that is happening check the brake pads first, if they are fine just top off the break master cylinder.

Keith

Darwin's 8 · 02-17-2007, 09:05 PM

Well I know the "Brake" light comes on when im parked but this light says "Anti Lock". I'll try checking the pads and fluid and maybe the tire pressure. I know the cold weather can decrease the pressure and it could be messing with the sensor.

As far as the misfire, does it usually mean it's consistantly misfiring? If so, can this damage anything? They didn't clear the code for me so do I just disconnect the battery to reset it?

Warrtalon · 02-17-2007, 09:20 PM

No, it's not an actdual misfire. It's just a bug that our cars get. A tuner can tune it out during a flash, but it's a normal problem that Evos have.

Darwin's 8 · 02-19-2007, 04:16 PM

So I got my car back from Mile High today and they basically said that it was a random misfire. Same code and everything. They reflashed my PCM, topped off everything and cleared the code and said it should be good. We'll see i guess.

Warrtalon · 02-19-2007, 05:59 PM

Was the car not already tuned with a flash?

Darwin's 8 · 02-19-2007, 06:33 PM

No, the only thing it was tuned with before was the SAFC 2 which isn't a real tune. So this was the first flash i've had. The car feels better for some reason as far as idle and throttle response. Do you think the reflash hepled anything?

Warrtalon · 02-19-2007, 07:22 PM

Maybe, but is the SAFC still connected or completely removed?

If you need to get tuned (flash) now, we can take care of that if you'd like.

Darwin's 8 · 02-19-2007, 08:24 PM

Yes, the AFC is still connected. I was going to get rid of it.

Is a flash and a tune the same thing? Whats the difference? I would definetly want to get a custom tune but I think you said to wait till I get my cams. I'll be getting a set of HKS 272/272 in the next month or so.

Warrtalon · 02-19-2007, 08:26 PM

Well, a tune is a tune. You know what that means. A flash is a form of tuning just like the SAFC. You said you got a dealer flash, but the SAFC is still working if it's not set to 0, so nothing should have changed as far as the behavior of the car unless it actually had been flashed by a tuner previously.

I can get you custom flashed locally when you're ready, but yeah, get the cams first.