[Beasters]

Hello again, my Bimmer Boys.

I have consistently been getting some different mixture codes and code 2D2E throttle valve angle intake manifold vacuum correlation code on cold start since it has gotten colder outside. Im running MHD Stage 2+ on V7.1.

I read that some people think the mixture codes could be caused by leaking injectors that leak overnight causing The car to run rough on cold start and causing these codes so I went ahead and I bought six used genuine BMW index 12 injectors and replaced The seals and coupler rings. I got these exact codes before I change the injectors on cold start and now I can confirm I have the same codes after replacing all of these injectors on cold start… pretty frustrating. Needless to say, the injectors are not the issue in this case.

I’m starting to wonder if I maybe have a vacuum leak somewhere but I don’t get the 30FF code and car pulls very hard! My vacuum at idle warmed up is around -9.5. The one thing I noticed is the low pressure fuel pump is right around 72 psi at idle and the AFR‘s at the very beginning of a cold start look kind of lean like around the 17s but after a minute or so after cold start the AFRs start to go down and end up right around 14.7 Ish like it should be at idle. Also, it’s like 25° here right now very cold.

One thing I will mention when I bought this car less than a year ago. I did a boost leak test with compressed air and found that I had a large leak at the rear turbo inlet from where the previous owner installed 2 inch inlets and had to use an adapter to connect the 2” inlet to the stock 1.75” rear turbo. It looked like a complete bitch to get to and it looks like it is technically attached, but air can seep out of the adapter during a boost leak test. This is on the intake side so I don’t think this is causing this issue, but I just wanted to mention it.

The car runs amazing other than this most recent cold start issue and as soon as the car runs for a couple minutes, and I clear the codes, you would never know that It had a problem. The car seems to throw the check engine light every three or four cold starts.

I did notice that the car also has a Shadow 2AAF Fuel pump plausibility code. I have recently replaced the fuel pressure regulator because it was leaking in the car started smelling like gas a few months back. The car still currently has the original fuel pump but I’m planning on replacing that with a 450 Walbro DIY pump soon. Before I replace the injectors, I even noticed misfire on cylinder 2 and 5, which is why I decided to replace the injectors with the index 12 used ones. I’ve only started the car a few times since installing the new Before I replace the injectors and already had all the same codes come back since replacing them.. but without the misfire codes.. but I didn’t get the misfire codes every time before I replace the injectors FYI.

Hope someone can point me in the right direction. I’ve read the 2D2E code is hard to diagnose and cant seem to find anyone with a confident solution. Hope someone can help me figure this out! Love this car… I’m assuming all these codes together are related. I did not start having these codes until the weather started getting colder but that could just be a coincidence maybe.

Thanks to anyone who reads this long post and has any ideas or recommendations!!!

- DME active codes -
29EO - DME: Mixture control.
29E1 - DME: Mixture control 2.
2A2B - DME: Mixture control.
2A2C - DME: Mixture control 2.
2D2E - DME: Throttle-valve angle - intake-manifold vacuum, correlation.

- DME shadow (inactive) codes - 29F4 - DME: Catalytic-converter conversion.
29F5 - DME: Catalytic-converter conversion 2.
ZAAF - DME: Fuel pump, plausibility.

[Beasters]

So this morning I needed to start the car and it is a very cold morning about 15 degrees outside.

I did a log on cold start after resetting all adapatations and clearing codes.

Car ran very rough and I have 3 logs that I did

Log 1 completely cold
https://datazap.me/u/beasters/log-17...2-26&solo=3-26

Log 2 cleared the codes but never turned the car off and started to log again.. car ran better after that. The codes that came up were
- DME active codes -
29D1 - DME: Combustion misfires, cylinder 5.
2D2E - DME: Throttle-valve angle - intake-manifold vacuum, correlation.
This is the log after clearing those codes without turning car off
https://datazap.me/u/beasters/log-17...olo=3-14-15-26

Log 3 moved the about 20 feet and continued to let the car idle for a while and continue to warm up
After rechecking the codes I had these codes come back
29EO - DME: Mixture control.
29E1 - DME: Mixture control 2.
2D2E - DME: Throttle-valve angle - intake-manifold vacuum, correlation.
https://datazap.me/u/beasters/log-17...2-26&solo=3-26

What’s interesting is I had these same exact codes before installing the index 12 injectors.. Literally nothing has changed with my check engine codes since installing the index 12 injectors. This has nothing to do with injectors….

Hope this data helps someone help me figure this out lol. Thanks!

[Sgop335]

logs like these are helpful...

looked only at the first log but supports what I thought and may be the clue needed for these codes...

There is a good air leak somewhere sucking in to the intake manifold (POST throttle body...key word)

running quite lean. TB is trying best to close up to reduce the air, but its not coming thru the TB!

STFt doing its best to richen the afr, pegged at 34. Looks like quite a leak...


PS: if there is No air Leak (post throttle body), then it is a defective TB that is not able to regulate the air flow...

[Beasters]

Originally Posted by Sgop335

logs like these are helpful...

looked only at the first log but supports what I thought and may be the clue needed for these codes...

There is a good air leak somewhere sucking in to the intake manifold (POST throttle body...key word)

running quite lean. TB is trying best to close up to reduce the air, but its not coming thru the TB!

STFt doing its best to richen the afr, pegged at 34. Looks like quite a leak...

You the man, I figured these logs might help someone smarter than me diagnose my problem. I am off work the next two day and I have thought about trying to hook smoke up to a vacuum line to look for a vacuum leak. I will report back. Thanks again!

[Beasters]

[QUOTE=Sgop335;31687750]logs like these are helpful...

looked only at the first log but supports what I thought and may be the clue needed for these codes...

There is a good air leak somewhere sucking in to the intake manifold (POST throttle body...key word)

running quite lean. TB is trying best to close up to reduce the air, but its not coming thru the TB!

STFt doing its best to richen the afr, pegged at 34. Looks like quite a leak...


PS: if there is No air Leak (post throttle body), then it is a defective TB that is not able to regulate the air flow...

So I went ahead and bought a cigar and a transfer pump from Harbor freight and I hooked one end of the transfer pump to the cigar to suck in the smoke and put the other side of the transfer pump and connected it to the vacuum line going into the intake manifold and I pumped the whole cigar and the only smoke that I found while pumping hard was a little bit of smoke coming from the intake manifold gaskets. Would this make sense? I’m wondering if I just was causing smoke to push through because I was pumping through the blow off valve vacuum hose going to the intake manifold. Do you think a leaking intake manifold gasket could cause the issue I’m having? Car runs great when its warmed up and only started running like this since its been cold outside and only on cold start.

[Sgop335]

Intake manifold leak can cause this but can’t judge online if the leak is significant.
Is the leak more when cold, due to gaskets?
Was any work done recently to cause this leak?
Has TB been replaced w a known good one?

Looked at log 3 and the Afrs are back to normal. Throttle is barely open at 1.6 and stfts are very high. Not sure what the normal TB opening is at idle…but normal stfts at idle can be close to 0, which is causing the mixture control codes

[Beasters]

Originally Posted by Sgop335

Intake manifold leak can cause this but can’t judge online if the leak is significant.
Is the leak more when cold, due to gaskets?
Was any work done recently to cause this leak?
Has TB been replaced w a known good one?

Looked at log 3 and the Afrs are back to normal. Throttle is barely open at 1.6 and stfts are very high. Not sure what the normal TB opening is at idle…but normal stfts at idle can be close to 0, which is causing the mixture control codes

Thank you again so much for being responsive with me on helping me diagnose this issue. I’m having… I really can’t tell you how much I appreciate it. So I realized last night when I tried the test I had one of the Intake sides leaking air a lot… So I went ahead and blocked that side completely and I was able to confirm it seems like I have a lot of smoke leaking out of the intake manifold gaskets. I wonder if possibly the gaskets don’t leak as bad after the car has warmed up for a couple minutes? I’m not Really sure but I have ordered new intake manifold gaskets on Amazon and they will be here tomorrow. I really hope that they solve this cold start problem that I’m having but I will say a lot of smoke was coming out of multiple intake manifold gaskets so I’m hopeful.

The thing is, I don’t think that I’ve had a boot leak… The car feels great to me, but what do I know? I also have not been getting the normal boost leak code 30FF.. I’m not really sure if an intake manifold gasket leak would cause that code to come or not or if maybe these gaskets don’t leak as bad once The engine is warmed up.

On log 3 I had cleared the check engine light codes and misfire code that I had on cylinder five but I never turned the car off. As soon as I clear the codes, the car runs great again like nothing ever happened until the next time I turn off the car and do a cold start.

I will say that I checked the codes again after log 3 which was only a couple minutes after clearing all the codes and code “2D2E - DME: Throttle-valve angle - intake-manifold vacuum, correlation” had already come back but the car was running better still.

I’m not looking forward to replacing the intake manifold gaskets tomorrow, but it seems like it’s worth a shot with how much smoke was coming out of them today.

[Beasters]

Originally Posted by Sgop335

Intake manifold leak can cause this but can’t judge online if the leak is significant.
Is the leak more when cold, due to gaskets?
Was any work done recently to cause this leak?
Has TB been replaced w a known good one?

Looked at log 3 and the Afrs are back to normal. Throttle is barely open at 1.6 and stfts are very high. Not sure what the normal TB opening is at idle…but normal stfts at idle can be close to 0, which is causing the mixture control codes

I went ahead, removed the intake manifold and installed 6 new intake manifold rubber gaskets and torqued it down to 11 ft lbs. I cleared all colds and reset all adaptations. Cold start was good and no code came up during the cold start or during the 20 minute drive. Here is the cold start log. Started out a bit lean.. around 17ish for a very short amount of time but then went around 14.7 and stayed there the rest of the warm up. No misfires or codes thrown…. Yet. My fingers are crossed I just had a big intake manifold leak…
https://datazap.me/u/beasters/log-17...og=0&data=3-22

[Sgop335]

Originally Posted by Beasters

I went ahead, removed the intake manifold and installed 6 new intake manifold rubber gaskets and torqued it down to 11 ft lbs. I cleared all colds and reset all adaptations. Cold start was good and no code came up during the cold start or during the 20 minute drive. Here is the cold start log. Started out a bit lean.. around 17ish for a very short amount of time but then went around 14.7 and stayed there the rest of the warm up. No misfires or codes thrown…. Yet. My fingers are crossed I just had a big intake manifold leak…
https://datazap.me/u/beasters/log-17...og=0&data=3-22

What a difference! Stfts are close to 0, tb is higher….good job, that leak had to be go anyway

[Beasters]

Originally Posted by Sgop335

What a difference! Stfts are close to 0, tb is higher….good job, that leak had to be go anyway

Here is one last cold start log I decided to do this morning. https://datazap.me/u/beasters/log-17...ata=3-22-24-25

It was about 45 degrees outside. This is like day 3 of no codes being cleared and since I reset adaptations. I know for a fact I would have had a check engine light pop up by now. I really wanted to have an exact answer of what was causing code 2D2E - DME: Throttle-valve angle - intake-manifold vacuum, correlation. When searching on these forums no one had an exact answer and a lot of people thought it could be caused by the throttle body position sensor or injectors. My 2D2E was also acompanied by mixture codes like 29E0, 29E1, 2A2B, 2A2C sometimes and even an occasional combustion misfire code.

My solution was to replace the intake manifold rubber gaskets and torque the intake manifold back down to 11 ft lbs. I wanted to make sure I left a detailed post to help anybody else in the future. If you have these codes that I had.

Thank you so much to Sgop335 for the input on my logs that I originally posted. I learned from you that the STFt should be as close to 0 as possible at idle. I am trying to learn more about tuning in general so I can possibly tune my own car in the future. Thank you for the POST throttle body vacuum leak suggestion. I’m assuming the previous owner removed the intake manifold and never replaced the original gaskets…. Amazing what $15 gaskets can do… I kind of wish I tried this and realized all of this before buying and installing 6 used index 12 injectors but I guess at least now I know that I have all index 12 and if I ever need to replace one, I can just replace one at a time now.

Many other posts about my codes that I had during this cold start issue pointed at injectors because I think they’re an easy thing to point at whenever you have a problem lol. I wanted to make sure I left a detailed post to help anybody else in the future. If you have any of these codes that I had.

[e nine dee two]

Originally Posted by Beasters

Hello again, my Bimmer Boys.

I have consistently been getting some different mixture codes and code 2D2E throttle valve angle intake manifold vacuum correlation code on cold start since it has gotten colder outside. Im running MHD Stage 2+ on V7.1.

I read that some people think the mixture codes could be caused by leaking injectors that leak overnight causing The car to run rough on cold start and causing these codes so I went ahead and I bought six used genuine BMW index 12 injectors and replaced The seals and coupler rings. I got these exact codes before I change the injectors on cold start and now I can confirm I have the same codes after replacing all of these injectors on cold start… pretty frustrating. Needless to say, the injectors are not the issue in this case.

I’m starting to wonder if I maybe have a vacuum leak somewhere but I don’t get the 30FF code and car pulls very hard! My vacuum at idle warmed up is around -9.5. The one thing I noticed is the low pressure fuel pump is right around 72 psi at idle and the AFR‘s at the very beginning of a cold start look kind of lean like around the 17s but after a minute or so after cold start the AFRs start to go down and end up right around 14.7 Ish like it should be at idle. Also, it’s like 25° here right now very cold.

One thing I will mention when I bought this car less than a year ago. I did a boost leak test with compressed air and found that I had a large leak at the rear turbo inlet from where the previous owner installed 2 inch inlets and had to use an adapter to connect the 2” inlet to the stock 1.75” [...]

I have this same issue, no injectors leak from a leak test, but I do have misfiring atm. Following