P0420 and Startified tune

[TUX15ST]

Yeah thats pretty scary if they really are leaning it out, i doubt its anything crazy but certainly rich is better than lean lol

 

[Ceecab705]

I shouldn't have any leaks because the car is brand new. Maybe it fouled a sensor. I ran the cobb stage 1 almost from new without any issues then I added the Stratified unexpected and it screwed up. I take full responsibility for this because they do say crackle pop is at your own risk. Let's see what happens.

 

[BiigMe]

Well I was running this tune on stock DP/MBRP exhaust, I think I'm gonna take the cracks off for now. Few questions;

According to Strat this is supposed to be Cat safe, is this true?

Whats so bad about getting the cracks from it being lean? TBH when I first got the tune I thought I smelled some burnt cats, but that was only when I was on it and I figured that at least some of the cracks had to come from it running rich.

 

[grnmachine02]

There's nothing wrong with lean off throttle. Lean a/f and lots of load is where there's a problem. Lean with no load isn't a big deal really. On the stock tune I was seeing decel A/F readings of 42:1.


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[me32]

This type of feature is also used in the Mustang world for what is called the loppy idle. They do not recommend running cats because there is a possibility of the cats getting damaged. Not saying strat tune will ruin the cat but there is that possibility.

 

[BiigMe]

There's nothing wrong with lean off throttle. Lean a/f and lots of load is where there's a problem. Lean with no load isn't a big deal really. On the stock tune I was seeing decel A/F readings of 42:1.


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Hmm, I think I'm gonna have to beat the inner child in me down and leave my tune with no cracks on for most of the time. I don't really feel like putting any excess stress on mah car. Gonna miss my pops though

 

[gabe]

You should be able to clear the code with your accessport. Run it with 1 of the other tunes to see if it comes back. If it doesn't then obviously all is well. However I agree stratified should take a look @ a few logs to see where the issue is coming from.

 

[Crooked Letta]

There's nothing wrong with lean off throttle. Lean a/f and lots of load is where there's a problem. Lean with no load isn't a big deal really. On the stock tune I was seeing decel A/F readings of 42:1.


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Exactly, also running lean actually creates more power. The problem is keeping cyl temps happy and this is why you run a richer mixture under load for safety.

 

[me32]

No new updates?

 

[Ceecab705]

Nothing yet because stratified is at Sema. I hope they get back to me ASAP when they get back. I already ordered both O2 sensors in case I have to get a new downpipe.

 

[me32]

Nothing yet because stratified is at Sema. I hope they get back to me ASAP when they get back. I already ordered both O2 sensors in case I have to get a new downpipe.

Keep us posted

 

[Ceecab705]

Will do. I've tried every tune including the 0 map from Cobb and I get the CEL. I still find that the car performs the same, though.

 

[92FOX]

Have you looked at the downstream O2 sensor? In a different vehicle, I had hit something on the road and it broke the wire for the downstream sensor. Could be something as simple as that maybe?

 

[Ceecab705]

I will check that tomorrow, however, I don't think it's the case.

 

[92FOX]

Most likely isn't, especially considering the tune, but worth a look for sure. Hopefully you get it resolved either way.

 

[Ceecab705]

Here's what Stratified had to say...
"Hi Carlos,



This is a little odd ? it is the first time we have seen this. How many miles are on the car overall? The code won?t put the car in limp mode or have any running effect, but it will prevent the car from passing emissions. There are a few options:



1. We can turn off the code but it will not be able to pass emissions with the code turned off if emissions testing is required in your area.
2. You can uninstall the AP completely, put some miles on the car, and see if the code is thrown again on the completely OEM tune with the AP uninstalled. If it is you can take it in to your dealer to have this looked at and potentially the downpipe or secondary O2 replaced. We run these on cars with OEM catalytic converters and haven?t seen any issues so it is quite possible it is unrelated to the tune. There is no additional fuel being injected to cause the popping effect.
3. You install a J defouler on the secondary O2 sensors and we do not remove the code. If the code does not pop and readiness monitors set you will be able to pass emissions.


Let us know if you have any further questions.



Thank you,

Alex"

Do you guys know if can access the lower o2 from below without disassembling a bunch of stuff?

 

[92FOX]

You should be able to access the O2 with the car on ramps or jack stands easy enough, without disassembling anything. I haven't been under the car yet, but have never seen a car where you had to remove anything more than maybe an under tray to get to the rear O2

 

[Ceecab705]

I was under the car today to see where everything is at, and yeah, 92FOX, you are right. I guess I can start by replacing the lower o2, and then if that doesn't do it just get a depo racing catted downpipe. The worst case scenario in this whole thing actually is the path to a more efficient FiST.

 

[92FOX]

http://www.deporacing.us/shop/ford/25-50-discounted-ford-parts/

I emailed them and they had some damn good deals on catted and catless downpipes...this was a week ago.

 

[Ceecab705]

http://www.deporacing.us/shop/ford/25-50-discounted-ford-parts/

I emailed them and they had some damn good deals on catted and catless downpipes...this was a week ago.

Thanks, man, I got a hold of him.