Bad DISA w/o codes?

HerrK

641 posts · Joined 2010

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#2 · Sep 3, 2011

You wn't get any codes because the vac leak is not that large and there is no external vac connection. It is all internal to the electrically operated vac diaphragm, other wise a larger vac leak would trigger lean, misfire, or O2 codes. The electric part of the DISA is working otherwise you would get codes.

The concern with continuing to use the old one, aside from the fact that it's NFG, is that the plastic butterfly may fail next which will result in the engine possibly ingesting the plastic and possibly the metal pin. That would make for a bad day in the life of the engine and your wallet.

Replace it. You will probably notice a difference in drivabilty & fuel milage after you install the new DISA.

 

moiz21 Discussion starter

693 posts · Joined 2010

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#3 · Sep 3, 2011

Thanks. I guess I'll jump on that as soon as I find a good price for a new one, or save up for the average price . Oh well, better to have caught it now, then later when it could have been worse.

 

HerrK

641 posts · Joined 2010

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#4 · Sep 3, 2011

$172 @ ECS. A really decent price. Most places are around $200.

 

moiz21 Discussion starter

693 posts · Joined 2010

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#5 · Sep 4, 2011

Yea I saw that, and Tischer has it for a bit more, but with shipping and stuff comes to about even. And Tischer is local, so may end up getting it from them when I'm ready.

 

bluebee

25,378 posts · Joined 2008

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#6 · Sep 4, 2011 (Edited)

moiz21 said:

A while ago I had run across this video:

Click to expand...

Thanks for posting that video.

It's not the most eloquent of DIYs, but it should suffice.

I'll take the liberty of adding it to the bestlinks as follows:

- How to repair a rattling DISA unit (1) (2) (3) & why the DIfferenzierte SAuganlage ("Differential Air Intake") valve flap breaks (1), sometimes with parts sucked into the intake manifold (1) (2) (3) (4) (5) (6) (7) (8) & how the disa valve o-ring fails (1) (2) & how it can cause all sorts of cold-engine rough idle problems (1) (2) & where to get just the M54 DISA valve o-ring (1) & how the DISA valve operates (0) (1) (2) (3) (4) & an example of how a broken DISA valve can ruin your engine (1) & how to test DISA operation (1) (2) (3) (4) (5) & why check the DISA at 85K miles to 90K miles or whenever the airbox is removed (1).