Cel ... Lean Both Banks ...

[Xx 335Mangaki xX]

Catless Downpipes, Mission Performance Tune, and RK Intake. Tried searching
the forum and was wondering what steps to take to help troubleshoot. Thanks in advance.

[momos750]

Lean on both banks could mean a lot of things. Since you have a flash tune you need to talk to Mission and have them iron it out. They should have logs or be able to data log and determine what's going on. Do you have a cel?

[apexlocator]

A little more info OP. Were all of your mods done at the same time or in steps? Your mods are nearly identical to mine save for the DPs. What's the cel code? Ie: if you did your DPs last you could have a cel from that.

Anyways, out of all of your mods listed I would think the tune may be the issue if it is not just catless DP cel. Was it just bench flashed or dyno tuned?

[Xx 335Mangaki xX]

Originally Posted by momos750

Lean on both banks could mean a lot of things. Since you have a flash tune you need to talk to Mission and have them iron it out. They should have logs or be able to data log and determine what's going on. Do you have a cel?

I do have a CEL and it reads lean on both banks 1 & 2. Will contact Mission thank you.

Originally Posted by apexlocator

A little more info OP. Were all of your mods done at the same time or in steps? Your mods are nearly identical to mine save for the DPs. What's the cel code? Ie: if you did your DPs last you could have a cel from that.

Anyways, out of all of your mods listed I would think the tune may be the issue if it is not just catless DP cel. Was it just bench flashed or dyno tuned?

The most recent mod are the RK intakes the rest of the mods were done at the same time a few weeks ago and no issues occurred. The car was bench flashed. I would love to get the car dyno tuned. Are there any shops you would recommend in NYC. Thanks

[mike@x-ph.com]

First step would be to datalog

[13M5F10]

Originally Posted by Xx 335Mangaki xX

I do have a CEL and it reads lean on both banks 1 & 2. Will contact Mission thank you.

The most recent mod are the RK intakes the rest of the mods were done at the same time a few weeks ago and no issues occurred. The car was bench flashed. I would love to get the car dyno tuned. Are there any shops you would recommend in NYC. Thanks

Definitely data log and it's possible that the intakes are creating it. Is it reoccurring?

[R3dn3k Flyby]

Can you confirm which lean codes you're getting?

Can you also confirm if the downpipes you installed have cat sims, O2 spacers, or similar?

-James

[apexlocator]

Originally Posted by Xx 335Mangaki xX

I do have a CEL and it reads lean on both banks 1 & 2. Will contact Mission thank you.



The most recent mod are the RK intakes the rest of the mods were done at the same time a few weeks ago and no issues occurred. The car was bench flashed. I would love to get the car dyno tuned. Are there any shops you would recommend in NYC. Thanks

Perhaps the RK intakes are flowing more air than your tune can handle??

In the NE only dme comes to mind for custom tunes, but I think they're in Jersey.

I never bought into the whole "send in your DMEs for a generic bench flash" route. That's why I insisted Mission custom dyno tune my car and it's been flawless for the last few months.

Edit: I too installed RK intakes after my tune and have had no issues to date.

[Xx 335Mangaki xX]

Originally Posted by 13M5F10

Definitely data log and it's possible that the intakes are creating it. Is it reoccurring?

Yes I can clear the code and it would come back after about 100 miles

Originally Posted by R3dn3k Flyby

Can you confirm which lean codes you're getting?

Can you also confirm if the downpipes you installed have cat sims, O2 spacers, or similar?

-James

no sims or spacers with the downpipes. The tune resolved the CEL regarding the catless downpipes. I am not using a bmw tool just the ordinary snap on mechanics tool but the code is P0171

Originally Posted by apexlocator

Perhaps the RK intakes are flowing more air than your tune can handle??

In the NE only dme comes to mind for custom tunes, but I think they're in Jersey.

I never bought into the whole "send in your DMEs for a generic bench flash" route. That's why I insisted Mission custom dyno tune my car and it's been flawless for the last few months.

Edit: I too installed RK intakes after my tune and have had no issues to date.

Would they dyno a car that doesn't have their tune installed?

[ARC550]

Plugs/O2 sensors / Injectors

Bet you a shiny nickel it's one of the above ...
If it's not you sir have a ticking time bomb on your hands.

[MFIZZLENYC]

I would say your tune 👌

[MSIXCARBON]

I willing to bet when it gets warmer it won't appear anymore. Sounds dumb but I have the RK Intakes as well and I think its the combination of the intakes and colder denser air. When its above 45 degrees I never have a CEL light.

[MFIZZLENYC]

I have the rk intakes just ran the car yesterday 30 degrees out no issues what so ever put about 100 miles of hard driving did a bunch of pulls and stop and go traffic

It's your tune

[wakeofdeath]

Originally Posted by Xx 335Mangaki xX

Catless Downpipes, Mission Performance Tune, and RK Intake. Tried searching
the forum and was wondering what steps to take to help troubleshoot. Thanks in advance.

Time ticking bomb tune

[MFIZZLENYC]

Originally Posted by wakeofdeath

Time ticking bomb tune

Clarify your talking about op tune or mine ?

[wakeofdeath]

Originally Posted by MFIZZLENYC

Clarify your talking about op tune or mine ?

My bad quoted wrong !

[apexlocator]

Originally Posted by Xx 335Mangaki xX

Yes I can clear the code and it would come back after about 100 miles



no sims or spacers with the downpipes. The tune resolved the CEL regarding the catless downpipes. I am not using a bmw tool just the ordinary snap on mechanics tool but the code is P0171



Would they dyno a car that doesn't have their tune installed?

Did you get this worked out? I got the P0171 CEL code due to using spacers on the pre-cat O2 sensors. I've since had the spacers removed and my CEL light went away, although I havent been able to clear the CEL code from memory. I just used my Autel hand held reader.

[Pwantwan]

Originally Posted by MSIXCARBON

I willing to bet when it gets warmer it won't appear anymore. Sounds dumb but I have the RK Intakes as well and I think its the combination of the intakes and colder denser air. When its above 45 degrees I never have a CEL light.

I second that - but what's the science behind it in order to fix the problem of CEL appearing in the winter months? Also why does it take between 50-100km to appear once removed?

For Reference the error codes I see appearing:
118010 Mixture control, cross-bank: Fuel-air mixture too lean.
118110 Mixture control 2, cross-bank: Fuel-air mixture too lean.

[apexlocator]

Ok so I've been getting the codes P0171 and P0174 on and off a couple times ever since my DPs went in, lean in banks 1 and 2. I also have RK intakes and am on a custom tune by MissionPerformance putting out about 670/650 pre-DPs. I would only get those codes around 8pm as I'm leaving work and it's colder, and I'm just cruising out of the parking lot.

So I stopped by MissionPerformance and Alex hooked up his laptop to data log as we went for a test run. Unfortunately I had cleared the codes the day before. But he was able to see that at idle and low cruising power car was leaning out. At WOT everything was ok though.

Alex thinks that the combo of intakes and DP + my tune is creating a little too much flow that the car cannot adjust at the low end; the MAF needed to be "rescaled" to compensate. My tune was based on OEM cats. WOT is unaffected because car relies on MAP sensors at that point. So he makes some adjustments, richens up the low end a little and I'm off. I'll see how things are in the next couple weeks. Alex talks a little fast sometimes as he is explaining things, but that's basically my understanding of things

[Pwantwan]

Hope this solves it for you - keep us posted! Any chance to get a contact for Alex at MissionPerformance?

Originally Posted by apexlocator

Ok so I've been getting the codes P0171 and P0174 on and off a couple times ever since my DPs went in, lean in banks 1 and 2. I also have RK intakes and am on a custom tune by MissionPerformance putting out about 670/650 pre-DPs. I would only get those codes around 8pm as I'm leaving work and it's colder, and I'm just cruising out of the parking lot.

So I stopped by MissionPerformance and Alex hooked up his laptop to data log as we went for a test run. Unfortunately I had cleared the codes the day before. But he was able to see that at idle and low cruising power car was leaning out. At WOT everything was ok though.

Alex thinks that the combo of intakes and DP + my tune is creating a little too much flow that the car cannot adjust at the low end; the MAF needed to be "rescaled" to compensate. My tune was based on OEM cats. WOT is unaffected because car relies on MAP sensors at that point. So he makes some adjustments, richens up the low end a little and I'm off. I'll see how things are in the next couple weeks. Alex talks a little fast sometimes as he is explaining things, but that's basically my understanding of things

[Xx 335Mangaki xX]

Originally Posted by apexlocator

Ok so I've been getting the codes P0171 and P0174 on and off a couple times ever since my DPs went in, lean in banks 1 and 2. I also have RK intakes and am on a custom tune by MissionPerformance putting out about 670/650 pre-DPs. I would only get those codes around 8pm as I'm leaving work and it's colder, and I'm just cruising out of the parking lot.

So I stopped by MissionPerformance and Alex hooked up his laptop to data log as we went for a test run. Unfortunately I had cleared the codes the day before. But he was able to see that at idle and low cruising power car was leaning out. At WOT everything was ok though.

Alex thinks that the combo of intakes and DP + my tune is creating a little too much flow that the car cannot adjust at the low end; the MAF needed to be "rescaled" to compensate. My tune was based on OEM cats. WOT is unaffected because car relies on MAP sensors at that point. So he makes some adjustments, richens up the low end a little and I'm off. I'll see how things are in the next couple weeks. Alex talks a little fast sometimes as he is explaining things, but that's basically my understanding of things

Thank you Apex for the info, I recently went to get dyno tuned hoping to get the CEL and running lean codes resolved and was told that I had MAF correction being applied and thats probably what the problem was. Did a few "street runs" and all logging looked great. Power delivery is definitely a lot more linear but the CEL and codes returned just a few days later. Hoping your outcome is different. I was also told that the car was maxing at 22lbs of boost yet the upgraded TMAP sensors were purchased. Dont know next steps but will wait to hear. Thanks again

[MFIZZLENYC]

Originally Posted by Xx 335Mangaki xX

Thank you Apex for the info, I recently went to get dyno tuned hoping to get the CEL and running lean codes resolved and was told that I had MAF correction being applied and thats probably what the problem was. Did a few "street runs" and all logging looked great. Power delivery is definitely a lot more linear but the CEL and codes returned just a few days later. Hoping your outcome is different. I was also told that the car was maxing at 22lbs of boost yet the upgraded TMAP sensors were purchased. Dont know next steps but will wait to hear. Thanks again

get new Tuner