N249 Delete completed (edit: see other post)
07-19-2004, 12:55 PM
#1
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N249 Delete completed (edit: see other post)
I decided to do a more conventional approach, since at least one other got CEL with this. The URL should show you what I did since. I recommend the other method as of now, since it works for everyone and is simpler.
Well, after fiddling a bit with doing a partial bypass of the N249 I decided on just bypassing the sucka altogether. Why? I was missing quite a bit of smoothness in throttle transitions.
It was relatively simple. There are three hoses which connect the N249 and and its one way valve to between engine vacuum, the vacuum reservoir and the BPV's. I unhooked the hose going to the BPV hardpipe, the other going to the back of the manifold and the third, to the vacuum reservoir. In order to remove the last hose, I had to flip over the coolant reservoir. This plastic hard pipe was plugged after I removed the hose (no need to though).
I then reused the almost perfectly bent hose from the vacuum reservoir to connect the hard pipe to the manifold. I taped the end of the N249 connector and dropped it in the valley of the block.
It works better than I could have expected. The BPV's respond infinitely quicker. Very smoooth throttle transitions. I still have to check for a code due to my D/Cing the valve entirely, but I doubt it really matters anyhow.
EDIT: I VAG'd and got an N249 open circuit code. I tried a 5W resistor to no avail. I measured the N249 at about 33 ohms so I'm going to give it a shot with different resistors.
The car works fine with the code, I just want to get rid of it nevertheless.
<img src="http://pictureposter.audiworld.com/38083/cimg0724.jpg">
Overall view of my engine compartment. Don't mind the mess.
<img src="http://pictureposter.audiworld.com/38083/cimg0723.jpg">
You can see the hose routing around to the back of the manifold.
<img src="http://pictureposter.audiworld.com/38083/cimg0720.jpg">
Most of the leftover bits.
<img src="http://pictureposter.audiworld.com/38083/n249.jpg">
This is how it was installed from the factory.
<img src="http://pictureposter.audiworld.com/38083/no_n249.jpg">
This is how it's installed now, I X'd all the stuff eliminated. The yellow line represents the hose which is the only thing left of the system. The line across the vacuum canister indicates a cap.<ul><li><a href="https://forums.audiworld.com/s4/msgs/1710479.phtml">https://forums.audiworld.com/s4/msgs/1710479.phtml</a</li></ul>
Well, after fiddling a bit with doing a partial bypass of the N249 I decided on just bypassing the sucka altogether. Why? I was missing quite a bit of smoothness in throttle transitions.
It was relatively simple. There are three hoses which connect the N249 and and its one way valve to between engine vacuum, the vacuum reservoir and the BPV's. I unhooked the hose going to the BPV hardpipe, the other going to the back of the manifold and the third, to the vacuum reservoir. In order to remove the last hose, I had to flip over the coolant reservoir. This plastic hard pipe was plugged after I removed the hose (no need to though).
I then reused the almost perfectly bent hose from the vacuum reservoir to connect the hard pipe to the manifold. I taped the end of the N249 connector and dropped it in the valley of the block.
It works better than I could have expected. The BPV's respond infinitely quicker. Very smoooth throttle transitions. I still have to check for a code due to my D/Cing the valve entirely, but I doubt it really matters anyhow.
EDIT: I VAG'd and got an N249 open circuit code. I tried a 5W resistor to no avail. I measured the N249 at about 33 ohms so I'm going to give it a shot with different resistors.
The car works fine with the code, I just want to get rid of it nevertheless.
<img src="http://pictureposter.audiworld.com/38083/cimg0724.jpg">
Overall view of my engine compartment. Don't mind the mess.
<img src="http://pictureposter.audiworld.com/38083/cimg0723.jpg">
You can see the hose routing around to the back of the manifold.
<img src="http://pictureposter.audiworld.com/38083/cimg0720.jpg">
Most of the leftover bits.
<img src="http://pictureposter.audiworld.com/38083/n249.jpg">
This is how it was installed from the factory.
<img src="http://pictureposter.audiworld.com/38083/no_n249.jpg">
This is how it's installed now, I X'd all the stuff eliminated. The yellow line represents the hose which is the only thing left of the system. The line across the vacuum canister indicates a cap.<ul><li><a href="https://forums.audiworld.com/s4/msgs/1710479.phtml">https://forums.audiworld.com/s4/msgs/1710479.phtml</a</li></ul>
07-19-2004, 01:07 PM
#4
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Surely, you Jest.
In case you don't:
It's a valve which the ECU uses to open and close the BPV's at will. It has its own vacuum storage and can/will dump vacuum to open the BPV's.
Problem is the BPV's aren't directly connected to engine vacuum so their response is delayed by the N249.
Oh, and STFA should reveal quite a bit there, Jedi Master
It's a valve which the ECU uses to open and close the BPV's at will. It has its own vacuum storage and can/will dump vacuum to open the BPV's.
Problem is the BPV's aren't directly connected to engine vacuum so their response is delayed by the N249.
Oh, and STFA should reveal quite a bit there, Jedi Master
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07-19-2004, 01:16 PM
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i think it's vacuum for some evap purge valve. i dunno. i haven't looked much into it..but,
i know when my check valve broke and it lost vacuum, my CEL went on because of that. 
if you get past it, great, one less problem to worry about 
if you get past it, great, one less problem to worry about