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      07-22-2017, 05:06 PM   #1
claasmi
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Car dies immediately on startup after 3 stage IM install runs fine with MAF unplugged

I just installed a 3 stage intake and after putting everything back together when starting
a the car it idles very eraticaly for a few seconds and then dies. I discovered that if I unplug the MAF sensor it idles fine. I had no issues at all before the install. I tried cleaning the MAF with MAF cleaner and double checked all the connections and everything seems fine but it still dies with the MAF plugged in. The 3 stage intake was used so not sure if there could be something wrong with it but it looked fine and I cleaned it thoroughly before installing. With the MAF unplugged I am getting a 2F08 (inlet air temperature sensor, signal) code. Any ideas what the problem could be? I somehow don't think it's actually the MAF but I'm going to try to find and swap in another one to see if the issue persists.

Last edited by claasmi; 07-22-2017 at 05:59 PM.
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      07-22-2017, 07:36 PM   #2
Suhb
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http://cdn4.pelicanparts.com/techart...mall/pic03.jpg

The sensor on the right side of this picture should be the air intake temp sensor. Check that.
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      07-23-2017, 09:33 AM   #3
claasmi
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Quote:
Originally Posted by Suhb View Post
http://cdn4.pelicanparts.com/techart...mall/pic03.jpg

The sensor on the right side of this picture should be the air intake temp sensor. Check that.
Isn't that the differential pressure sensor? http://www.realoem.com/bmw/enUS/show...diagId=11_3756

From what I understand the intake air temp sensor is built into the MAF, so the code I am getting makes perfect sense since I have the MAF disconnected.
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      07-23-2017, 03:44 PM   #4
claasmi
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Well I'm an idiot. Took everything apart again to double check and there was a hose (connecting to intake behind throttle body) that I forgot to plug in. Runs fine now.
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      07-24-2017, 10:00 AM   #5
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Quote:
Originally Posted by claasmi View Post
Well I'm an idiot. Took everything apart again to double check and there was a hose (connecting to intake behind throttle body) that I forgot to plug in. Runs fine now.
Good to know. How does it feel? Did you add a tune to the car yet and if so which one?

I'm on the lookout for a 3 stage manifold, any pointers on where to pick up or good sources? What's the market like right now for the used ones?
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      07-24-2017, 01:04 PM   #6
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Also curious what tune you are planning to go with. I've Picked up a manifold in the classified section, thinking to go with the BPC tune.
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      07-24-2017, 01:06 PM   #7
claasmi
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Yes I have the AA tune. I immediately noticed the additional power and better throttle response on the first drive after putting the tune on, but also noticed that the pops and burbles from my performance exhaust have been greatly reduced and there seems to be a lag when letting off the gas. I didn't reset adaptations though (the buttons were grayed out in the Simon software that came with the tune). I'm going to try resetting adaptations (I have another OBDII tool that can do this) and driving it for a little while before raising this with AA.

I bought the intake used on car-parts.com. It came off a 2011 328i with N51 engine. It was about $400 CAD shipped.
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      07-24-2017, 01:09 PM   #8
claasmi
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Quote:
Originally Posted by jan_b View Post
Also curious what tune you are planning to go with. I've Picked up a manifold in the classified section, thinking to go with the BPC tune.
I only just recently started reading about how the BPC tune is supposed to be slightly better than AA, but I had already bought the tune from AA at that point and got it on sale as a package deal with their headers.
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      07-24-2017, 02:47 PM   #9
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Quote:
Originally Posted by claasmi View Post
I only just recently started reading about how the BPC tune is supposed to be slightly better than AA, but I had already bought the tune from AA at that point and got it on sale as a package deal with their headers.
I have the BPC stage 1 tune, so far so good. They will be upgrading me to the 3 stage IM tune once I find an IM.

You got a decent price on the manifold...hard to find them. I'll admit I haven't been looking as hard as I should
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