Do Evos ecu store data?
Apr 27, 2012, 07:30 PM
#1
Do Evos ecu store data?
I had my tps back off on my 03 Viii and it ran bad then I slowly drove it the mile home and finally found out it was that, but when I plugged it back in it still runs bad, do I need to clear my ecu's data bc it didn't throw a light but might it still be hidden in there?
Apr 27, 2012, 08:24 PM
#2
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Yeah, it does store data so disconnecting the battery is probably a good idea. However, the idle will also be messed up by disconnecting the battery. You normally need to drive a little in stop and go traffic before the idle resets.
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Apr 30, 2012, 08:59 PM
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Usually disconnecting overnight, or disconnecting and hold the brake pedal to discharge any remaining power from the capacitors seems to be the best way to reset IMHO.
As mentioned, the tune is stored in flash-able EPROM, and won't be affected by this.
As mentioned, the tune is stored in flash-able EPROM, and won't be affected by this.
May 1, 2012, 10:03 AM
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Disconnecting the battery and reconnecting won't immediately change it I don't think. You need to complete a couple drive cycles in order for everything to relearn. Correct me if I'm wrong though.
May 1, 2012, 12:19 PM
#12
Okay I'll just tell the whole story then, maybe it will help lol. I was turning right onto the highway (like the wide long right ring style), I actually wasn't flooring it lol I was driving an average speed for a guy, And when I straightened out onto the highway and gave it about 3/4 throttle the car started to sound weird almost like it was bogging out, I pulled over and when I came to a stop the oil light came on so I killed the engine immediately and the car tried to die (like when you stall) before that. So I got out and checked all of the piping and oil and fluid levels and it all checked out. So then I had my dad, who has been around cars much longer than me but never an evo came up and we started it up, this time no oil light and it idled fine so I slowly creeped it home. During the ride we tried a couple things to see what was going on, at half throttle the car runs fine up until 3k then it acts like it's bogging out and the car does not accelerate with any more throttle applied only slows. And the turbo gets red and hot from doing this (noticed this when I popped the hood originally when i stopped the car). So when we got back we checked all the piping and pulled the cam cover, it's on time and nothing looked astray, so we put it back together, while looking around I noticed the TPS was off most of the way (the clip is gone now so if anyone has one I PLEASE PM me so I can buy it from you 
..) So I put it back on and after an hour of being mocked for not noticing it, we started up the car and it still acted the same way it did before, so I asked the original post to see if it could have stored the error and how to clear it. So I disconnected the positive and left it for about 2 hrs and came back, it continues to do it. Even while sitting if you take it up to 3k it makes the noise. So if you know what else it could be or if I need to unplug it longer let me know what you think!
..) So I put it back on and after an hour of being mocked for not noticing it, we started up the car and it still acted the same way it did before, so I asked the original post to see if it could have stored the error and how to clear it. So I disconnected the positive and left it for about 2 hrs and came back, it continues to do it. Even while sitting if you take it up to 3k it makes the noise. So if you know what else it could be or if I need to unplug it longer let me know what you think!
May 1, 2012, 04:42 PM
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spark plugs....
you check for fouled spark plugs? i had my plugs go bad and my car did the exact same thing, bogged and missed, changed to one step colder plugs and now it runs great.
and when ever i unplug my battery and the car is "LEARNING" its new idle. i turn everything on a/c headlights brights crank the stereo and let the idle move it self back up, i do that while in park.
and when ever i unplug my battery and the car is "LEARNING" its new idle. i turn everything on a/c headlights brights crank the stereo and let the idle move it self back up, i do that while in park.