Hey guys, hopefully someone could answer this.

I have been using the AP for about 1month now, have aem intake, megan downpipe, testpipe, and dual exit megan catback

when i was running this setup i would once in awhile under very extreme driving get the service engine soon light. Problem was the P1235 Map Plausability problem

This was with the Ca/Nv/Az 91 stage 2 Aem map

2 days ago i installed hks hi-power muffler(dual mufflers)

And probably everytime i mashed the throttle to the floor, this code came on rt away.

Called Cobb, told me to update all the software and to tryout the stage 2 + aem general map (not the CA one)

The light continues to come on with the same code, Also when this happens, the car idles around 2000rpms, I could turn the car off/ clear the code and the same will happen over and over again.

!.Does the Hks exhaust have too much flow for this tune?
2. Does this happen to anyone else with similar or same setup?
3. Any suggestions?

Thanks for all the help!!!

 

Why don't you try it without the intake and flash the standard (non-intake) map?

A while ago there were a lot of posts with tuners saying there is little or no additional power to be gained with an intake if you tune the car.

 

Just a guess, but i know when i had the megan exhaust on my EVO 8, You had to put the spark plug covers on the factory O2 sensor to prevent the CEL. Gimme a sec to see if i can find the link to this how to for you.

 

https://www.evolutionm.net/forums/ev...al-o2-fix.html

Found it...

 

Also you say you have intake, is this causing the blow off valve to vent to atmosphere, or is it recirculating for the MAF sensor to pick it up?

 

No, the mechanical fix is for the P0420 Cat efficiency code (COBB put a fix in the Stage 2 code for that, too). The OP has a different code, one which I had never got, but I'm not running an intake either.

 

its overboost code. I guess cobb didnt get it in the flashes, the ecuflash software has previsions for it, after a preliminary tune they immediately turn that code off. My friend was tuned and threw it because they forgot to disable it, same symptoms. Was easily corrected.

 

^+1

I had this code several times.. but it's because of my bov.. i switched over to the stocker and no more codes... but you should check lines if they are all connected/intake also did you pull boost pill??

 

my buddy usually threw it in cold weather and when brake boosting, but the tuner just turned it off, problem solved

Call cobb and get them to add it to their maps.

 

DON'T TURN OFF THIS CODE UNLESS YOU WANT TO BLOW YOUR MOTOR. Holy crap people, these airflow checks are in there for your motor's protection. Any tuner worth a damn should be able to set the airflow tables correctly.

OP, You have an o2 housing and a test pipe, both of which don't fall under Cobb's Stage 2 maps. You either have to remove some mods or get a protune.

If you added intercooler pipes you'd not be able to get out of your neighborhood without throwing the P1235 code.

This is one of the reasons why I got rid of my accessport (https://www.evolutionm.net/forums/ev...s-row-now.html)

 

This is actually not all that uncommon for people running a test pipe with a Cobb stage 2. You are going outside your airflow limit, which is why you get the map plausibility. Basically the car thinks it is flowing to much air, so something must be wrong.

This is really easy to fix. Download Acess Tuner Race. Once you get it, go to the Airflow limit table, and raise it by 5% in all rpm ranges above 2000. You can do this two ways. Either by highlighting the table, and multibplying the entire table by 1.05, or by manually changing values. The stage 2 map is as much as 30% over the stock value. They just didn't raise it enough for some of the test pipe systems out there that flow really well.

The cool thing is that this table does not effect the tune, only the airflow limit. So your afr's, timing, and boost, will not be effected. While it is common to get this code for overboosting, it is not what you are experiencing.

 

ok I'm no tuner, but I had an issue similar. My take on the situation is that the car is overboosting (check the AP to see what your boost is at full throttle in 4th). By moving the boost pill or adding it back I was able to taper the flow and reduce the boost pressure. Now I don't see the code anymore.

The code is protecting the tranny and motor from excess torque. When the transmission cpu sees too much torque from the engine, it disengages to protect itself and throws the warning. I'd be very interested in what your max boost is... I'm betting it's around 28-29 psi

 

While lowering the boost is one way to get out of this problem, it is actually because he is flowing more air than the airflow limit tables are set for, due to the lack of a cat. Adjusting the airflow limit tables will fix this. If this is an MR, he will also need to adjust the torque limit table by the same amount. It is actually easier, and faster, to adjust the tables by 5% than to swap out the pills, and won't cut his boost. The 1235 code is not a trans code. It is related to the airflow limit table.

 

Very interesting information about the tables... Wish my tuner knew something about it :P Anyhow if you don't want to mess with tables, just cut your boost until you do get a custom tune.. It's free, and it worked.

Thanks for the head's up kozmic... Maybe I'll give my tuner a call.. sucks that he's 7 hours away.....

 

evoxkrazy, the 1235 code has to do with the airflow limit tables. I'm sending you a PM.
You realize the stage 2 maps call for a turboback exhaust right?