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Old 01-09-2010, 08:19 PM   #1
Papaj3
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Cool CEL with lightened flywheel... I GOT THE FIX

I search and search for answers on how to fix the CEL for a misfire with a lightened flywheel. NO ANSWERS. Except the famous, OEM answer. Pffff. I needed emissions done on the wagon and I wouldnt pass with the CEL. I have an AP map that will fix the lightened flywheel misfire codes and up the sensitivity.

I have a 9.5lbs flywheel in there... I think the lightest they get. If you want the Map to fix this code, let me know. Huge headache if you're up for tabs soon.


PM me. I gots it.
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Old 01-09-2010, 09:13 PM   #2
Storm
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I believe this has been possible with romraider/opensource tuning for quite a while now.

Something along the lines of changing the knock count threshold from 1 to 2 or 3.


Jay
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Old 01-10-2010, 11:29 AM   #3
dan az
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no longer a count threshold, just click a button to completly disable the code.
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Old 01-19-2010, 10:12 AM   #4
Papaj3
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Ya but who rocks a ROM raider? Obviously the Access port is way more popular.
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Old 01-19-2010, 04:34 PM   #5
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I believe you are able to use AccessTUNERRace or whatever it is called to turn off codes if you are using an AccessPort.
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Old 01-19-2010, 06:42 PM   #6
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Quote:
Originally Posted by Papaj3 View Post
Ya but who rocks a ROM raider? Obviously the Access port is way more popular.
Hahaha are you sure? I know a few Subaru tuners personally and the open source tunes easily outnumber all the other options. I mean a cheapskate can have his car tuned with no need to even buy the dang cable.
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Old 01-19-2010, 07:35 PM   #7
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Quote:
Originally Posted by Storm View Post
I believe this has been possible with romraider/opensource tuning for quite a while now.

Something along the lines of changing the knock count threshold from 1 to 2 or 3.


Jay
I have a lightweight flywheel and tuning via OS. Before you were able to change the knock threshold/count from 1-5 but that just bypassed it and didn't really solve it so its not done anymore. So now adays you can only disable the trouble codes if ur using OS.
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Old 02-17-2010, 04:55 PM   #8
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has anyone ever really figured out why it does it? I've only seen guesses.
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Old 02-18-2010, 06:35 PM   #9
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has anyone ever really figured out why it does it? I've only seen guesses.
There are answers on this in the FAQ.
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Old 02-18-2010, 08:14 PM   #10
KAX
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Originally Posted by trick3d View Post
There are answers on this in the FAQ.
no, there are only guesses.
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Old 02-20-2010, 02:32 AM   #11
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Quote:
Originally Posted by Papaj3 View Post
Ya but who rocks a ROM raider? Obviously the Access port is way more popular.
















Lots of people use Open Source methods for tuning...
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Old 03-26-2010, 10:14 AM   #12
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Access Port is the easiest way to tune your WRX the right way the first time. Believe me.
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Old 04-07-2010, 11:16 AM   #13
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If you cleared the code with an AP, wouldn't it just throw a CEL again since nothing mechanically has changed?
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Old 04-07-2010, 04:55 PM   #14
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what is changed in the rom to fix this??

ive been thinking of getting a light fw but i dont wanna deal with the cel headache. its the famous misfire code right?

and by the way i use romraider for all you haters lol.

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Old 04-12-2010, 08:29 PM   #15
mmaurini
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Quote:
Originally Posted by trick3d View Post
There are answers on this in the FAQ.
Misfires are detected by measuring crankshaft acceleration using the crank trigger (PIP) wheel. Based on RPM, pedal position and engine load a certain acceleration / signal is deemed a good combustion event; anything below that is binned a misfire. Generally if you have more then a 1% misfire rate it would cause you to fail emissions and therefore the CEL is required to be illuminated.

In OEM land it is required to be sensitive enough to meet emissions thresholds which usually means taking into account every source of rotating mass in the drivetrain. In my experience I have seen OEM's re-certify their misfire monitor to the EPA for things as small as a change in the durometer of the engine mount.

Changing a flywheel can push you towards the edge of the detection envelope depending on how light it is. Generally disabling the code just makes the misfire monitor a non-CEL, but the monitor still runs in the background and counts misfires. A properly trained person with the correct tools can pull misfire rates for each cylinder that are stored in the PCMs' memory.

This is only the tip of the iceberg for the misfire monitor. To develop this monitor for a new vehicle usually takes 1 engineer with 2 cars at their disposal a solid month.

Hope this helps.
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Old 09-03-2013, 11:27 AM   #16
Applen
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thread resurrection: so i just had my lightened flywheel installed (came with private-sale purchase of '03 bugeye wrx) and my engine is not so happy. if i'm easy with the pedal and just let boost gradually build i can usually prevent the mis-fire detection (and subsequent violent/momentary loss of power), but with a full car and steep mountain highways it was getting quite annoying.

thanks for all who've provided insight in this thread! it sounds like i need a new map such that my fast-revving engine is not /detected/ as a misfire. my question though is: if i get some new map that ignores the stock misfire detection or increases the allowable count, is my engine not going to be able to check itself when an actual misfire occurs? how dangerous is a new map for this?

also, i'm a subaru newb. could someone spell out the options for acquiring a map to work /with/ the new flywheel?

TIA!
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Old 10-18-2013, 10:07 AM   #17
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Since someone bumped this up, I will chime in too.

About 3.5 years ago I disabled a couple codes because of my Lightweight flywheel. I think they are p0301,0302,0303,0304 {the 4 misfire codes} and there was 1 other, it would be a "ghost" code that would throw a CEL, but have no actual code. Everything was fine.

Fast forward to present, I now have an OEM flywheel and want to turn these codes on, but I lost my notes on it, and I searched for an hour and only found the above mentioned codes.. Can anyone refer me to which codes I would have disabled?

I waiting a response from my opensource guy to see if there is an easy way to just see what has been disabled. We have plans to do this tomorrow, and want to be prepared.
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Old 10-18-2013, 12:31 PM   #18
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Quote:
Originally Posted by madlife View Post
Since someone bumped this up, I will chime in too.

About 3.5 years ago I disabled a couple codes because of my Lightweight flywheel. I think they are p0301,0302,0303,0304 {the 4 misfire codes} and there was 1 other, it would be a "ghost" code that would throw a CEL, but have no actual code. Everything was fine.

Fast forward to present, I now have an OEM flywheel and want to turn these codes on, but I lost my notes on it, and I searched for an hour and only found the above mentioned codes.. Can anyone refer me to which codes I would have disabled?

I waiting a response from my opensource guy to see if there is an easy way to just see what has been disabled. We have plans to do this tomorrow, and want to be prepared.
Read the map. Alter Dtc's. flash.
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Old 12-30-2013, 02:25 PM   #19
daltoncarter007
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I have an 02 WRX and I need to pass smog. The lightweight flywheel is throwing misfires codes. I have it tuned with an AP to the VF34 map 91 octane. Can I use the AP to bypass the code?
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Old 01-01-2014, 07:45 AM   #20
02nismokiller
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Quote:
Originally Posted by daltoncarter007 View Post
I have an 02 WRX and I need to pass smog. The lightweight flywheel is throwing misfires codes. I have it tuned with an AP to the VF34 map 91 octane. Can I use the AP to bypass the code?
Read the post above yours... Just alter the codes and force readiness
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Old 01-02-2014, 12:32 PM   #21
daltoncarter007
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Originally Posted by 02nismokiller View Post
Read the post above yours... Just alter the codes and force readiness
I am really new to using the AP. Is there a thread on how to read map, alter codes, and flash? By the way I have a V1 AP if that changes anything.
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Old 01-03-2014, 07:45 AM   #22
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Quote:
Originally Posted by daltoncarter007 View Post
I am really new to using the AP. Is there a thread on how to read map, alter codes, and flash? By the way I have a V1 AP if that changes anything.

throw the ap v1 AWAY....its useless
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Old 05-16-2019, 11:59 AM   #23
Springs
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Originally Posted by Papaj3 View Post
I search and search for answers on how to fix the CEL for a misfire with a lightened flywheel. NO ANSWERS. Except the famous, OEM answer. Pffff. I needed emissions done on the wagon and I wouldnt pass with the CEL. I have an AP map that will fix the lightened flywheel misfire codes and up the sensitivity.

I have a 9.5lbs flywheel in there... I think the lightest they get. If you want the Map to fix this code, let me know. Huge headache if you're up for tabs soon.


PM me. I gots it.
Shed me this map please [email protected]
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Old 05-16-2019, 11:04 PM   #24
Charlie-III
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Shed me this map please [email protected]
He hasn't been on this forum in about 7 years.....
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