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      04-30-2017, 03:42 PM   #1
ebap990
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OFHG Replacement-- Wierd result

I just replaced my oil filter housing gasket with just a little over 100,000 miles on the clock.

Everything seems to have gone back together well. Restarted fine, no leaks.

But as soon as I pulled out of my driveway it went into limp mode and threw 2A87 and 3100 codes.

Any ideas on why that might be? Occam's razor says it is the result of something I did during the replacement, but I'm open to any suggestions.
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      04-30-2017, 04:43 PM   #2
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First make sure everything is plugged electrical wise.
2A87 is an exhaust vanos code, I believe
and 3100 is low boost engaged.

Once you make sure everything is connected properly and you still get these two codes try cleaning your vanos, both of them. If you still get it, then swap them and see if it changes from exhaust to intake.
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      04-30-2017, 08:48 PM   #3
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Make sure you got your vacuum line routing correct. Specifically your BOV's need their boost/vacuum reference from the intake manifold and the rear exhaust flap needs its reference from the vacuum pump.
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      04-30-2017, 11:45 PM   #4
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2a87 is exhaust vanos, 3100 is due the vanos code. Not sure why changing the ofhg would cause this other than possible getting some debris in the engine while the housing was off. If the code keeps coming back, try cleaning and swapping the solenoids and it might either fix the problem or you will have an intake vanos code. If it follows to the intake, replace the solenoids.
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      05-09-2017, 03:05 AM   #5
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2011 335is  [4.33]
I had a similar experience. Same codes. Tons of misfires. I drove home on limp, cleaned both vanos and that cleared it all up.
I think maybe a small piece of debris, like a thread from the cloth I used to wipe the block clean or maybe a small piece of gasket, or even maybe an air bubble was enough to cause a problem. Especially on already aging solenoids.
In any case. Cleaning the vanos is easy and quick and solved the issue 100%
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