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Old 12-16-2021, 02:42 PM   #1
ntg44
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2020 WRX STI

Default EGR not ready after 20g flex fuel build

Hey everyone,

Tried searching, couldn't find anything on this.

I recently got my car back from a 20g flex fuel build and cannot get the EGR to READY state after ~400 miles of driving. Some details about the build:

2020 STI
Cobb SF intake
Perrin 2.4 inch inlet pipe
Blouch 20g turbo
Cobb flex fuel kit
Fuel lines, rails, pressure regulator, etc.
Upgraded fuel pump
TGV deletes
Cobb catted downpipe

I ended up getting P0420 after about 50 miles on the new tune, so that CEL was suppressed and I'm going to re-enable the code and test again after I install the GESI 400 cell sport cat once it arrives. But I have not been able to get EGR ready in this time.

I've reached out to the shop who installed everything, and they said they didn't see any EGR system, and that mirrors my research on this subject so far. The tuner/shop also doesn't know why it's in NOT READY state. So I'm reaching out to the forum community as a last resort because I just want to be proactive in resolving the issue.

So my main questions are, does anyone know by chance from what I've written if is there something that would cause EGR to remain in NOT READY state? Is the EGR even supposed to be NOT READY, versus NOT SUPPORTED? Could it be the TGV deletes or the P0420 suppression that's causing it?

I'm not very knowledgeable in this area, so any help would be appreciated. Just wondering if there's an obvious culprit from my current setup that's causing this to happen. I feel like this platform is so well developed by this point that the answer should be obvious. Looking for an EJ guru's help on this one.

Thanks in advance.
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Old 01-05-2022, 09:27 AM   #2
ntg44
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Bump. I want to narrow my question down to this - Can anyone with a VA STI (Preferably 19+) with a Cobb stage 1 tune installed tell me what their EGR monitor reads? I'm speaking to multiple tuners that are giving me conflicting information, so I'd rather just find out directly from a stage 1 owner.

Thanks in advance.
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Old 01-06-2022, 02:45 AM   #3
a5m
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Try asking on IW STi or ClubWRX
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Old 01-06-2022, 04:45 PM   #4
ntg44
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Quote:
Originally Posted by a5m View Post
Try asking on IW STi or ClubWRX
Thanks, but I already tried that.


As an update to this thread, I was able to get into contact with a 2020 STI owner with an Accessport, and his EGR monitor is in READY state. So at this point, in my opinion it's most likely that the EGR monitor being not ready is linked to a code suppressed in the tune for the TGV deletes. My tuner has denied this, but nothing else was deleted from the car, and after 700 miles on the tune the EGR is still not ready, so I'm going with this for now.

I'm still waiting on the new GESi Gen 2 cat to come in, so I will update this thread with the results of the oxygen sensor monitor readiness with the new cat installed. I can still pass with 1 monitor not ready, so I'll just live with it as long as it's only the EGR monitor.
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Old 01-06-2022, 06:03 PM   #5
jon7009
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I believe that the OEM usage of both camshafts is to induce EGR effect at lower load/cruise under different cold/cruise conditions, and that it is also possibly tied into the TGV status. If you look at the OEM ECT related camshaft tables, intake advance is retarded, and the exhaust retard is instead, advanced, both of them up to 140F ECT. this gives a lot of overlap because retarding the intake cam and advancing the exhaust cam (by way of not giving it solenoid duty and hence oil pressure to move) and I can only think of this as being a part of cold engine emissions and used in the way to get EGR effect.

Your other option is to do opensource/oem calibration on single fuel and force pass the readiness monitors if you're trying to pass DEQ.

I don't have Cobb for that year/trim, but looking at Cobb for 08/09 the tables don't appear, and they do in at least 2016+ OEM ROMs. The ECT related AVCS tables that is.

If they are there, but they are just zero'd out, I wonder if mirroring stock values would somehow enable some check process hidden within the ecu.
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Old 01-06-2022, 06:15 PM   #6
ntg44
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Thank you, that was helpful.

At this point I'm just annoyed that my tuner doesn't have the answer. This is one of the most well known shops in the Midwest and I specifically told them I didn't want to deal with issues like this before deciding to move forward with the build.

I'll live with the EGR monitor not ready as long as I can get the oxygen sensor monitor ready. It'll be enough to pass IL emissions.
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Old 01-06-2022, 06:40 PM   #7
a5m
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Quote:
Originally Posted by ntg44 View Post
Thank you, that was helpful.

At this point I'm just annoyed that my tuner doesn't have the answer. This is one of the most well known shops in the Midwest and I specifically told them I didn't want to deal with issues like this before deciding to move forward with the build.

I'll live with the EGR monitor not ready as long as I can get the oxygen sensor monitor ready. It'll be enough to pass IL emissions.
Yea, in my interactions with Six Star I wasn't convinced to ever let them work on my car.

Did you hit up other tuners? There's some regulars on other forums who often chime in and are willing to help. Hope you get it sorted out.

EDIT: Shop wasn't Six Star - I inferred incorrectly.

Last edited by a5m; 01-06-2022 at 11:24 PM.
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Old 01-06-2022, 07:00 PM   #8
ntg44
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Quote:
Originally Posted by a5m View Post
Yea, in my interactions with Six Star I wasn't convinced to ever let them work on my car.

Did you hit up other tuners? There's some regulars on other forums who often chime in and are willing to help. Hope you get it sorted out.
Thank you. Yes I've started discussions with other tuners but right now I'm going to get as far as I can with my current tuner regarding the oxygen sensor readiness. If the new cat doesn't get the monitor ready then I'll need to explore other options to get my car to a state I want it to be at.

And just for the record, I did not get tuned at six star nor did they perform any of the work. I just don't want other people to infer false information. It's not my intention to bash anyone or any shop, just focus on getting these last few things resolved.
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Old 01-06-2022, 11:30 PM   #9
a5m
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Quote:
Originally Posted by ntg44 View Post
Thank you. Yes I've started discussions with other tuners but right now I'm going to get as far as I can with my current tuner regarding the oxygen sensor readiness. If the new cat doesn't get the monitor ready then I'll need to explore other options to get my car to a state I want it to be at.

And just for the record, I did not get tuned at six star nor did they perform any of the work. I just don't want other people to infer false information. It's not my intention to bash anyone or any shop, just focus on getting these last few things resolved.
Actually, I get it. That's why you paid them. I guess I'm too impatient. Good you have other options though.

I edited my post. My mistake. Shouldn't have assumed. Plenty of people with good experience from these shops.
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Old 11-09-2022, 02:03 PM   #10
ntg44
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Okay, resurrecting old thread, but I finally got some clarification on this, so thought I'd update the thread. According to my tuner, the TGVs on 18+ STIs are utilized as part of the EGR strategy. This explains why my EGR monitor never entered ready state when TGV codes were suppressed in the tune.

Now that Cobb made the Greenspeed changes, this might not be all that useful anymore, since much less people will probably be deleting them, but for anyone with an 18+, as if there weren't enough reasons to not delete TGVs, add this one to the list haha. Hope this helps at least one person out there.
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Old 11-09-2022, 02:04 PM   #11
ntg44
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Okay, resurrecting old thread, but I finally got some clarification on this, so thought I'd update the thread. According to my tuner, the TGVs on 18+ STIs are utilized as part of the EGR strategy. This explains why my EGR monitor never entered ready state when TGV codes were suppressed in the tune.

Now that Cobb made the Greenspeed changes, this might not be all that useful anymore, since much less people will probably be deleting them, but for anyone with an 18+, as if there weren't enough reasons to not delete TGVs, add this one to the list haha. Hope this helps at least one person out there.
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