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Old 08-07-2008, 01:37 PM   #1
stephenrodas
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Help!! What is the disa valve??

What is the disa valve?
What does it do?
Where is it located?
What happens to the vehicle when it goes bad?
Someone please help
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Old 08-07-2008, 03:27 PM   #2
kyle808
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Originally Posted by stephenrodas View Post
What is the disa valve?
What does it do?
Where is it located?
What happens to the vehicle when it goes bad?
Someone please help
It's also called the Adjuster Unit.

Symptoms: rough idle and SES light and maybe misfires.

Look here:

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Last edited by kyle808; 08-07-2008 at 03:32 PM.
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Old 08-07-2008, 03:39 PM   #3
Len013091
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The DISA valve switches the intake runner length AFAIK.
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Old 08-07-2008, 04:36 PM   #4
shortyb
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Originally Posted by Len013091 View Post
The DISA valve switches the intake runner length AFAIK.
Sort of. It actually changes the volume in the intake manifold. Easy DIY to take it out and clean it. It gets dirty enough after 60K to interfere with proper operation of the adjuster flap. When it hangs up, it causes the rough idle, misfires, and can throw a CEL code.
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Old 08-07-2008, 04:55 PM   #5
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The inlet system was provided with two technical refinements in 1998. One was a flap valve in the inlet plenum chamber that cut off the inlet passages of the front three cylinders from the rear three. The differentiated intake system, known as DISA, optimized the engine's running under full load. The other refinement was a dedicated system of tubes of very small diameters through which the inlet air was drawn during idling or when running at low loads. The increased turbulence that this achieved improved the combustion process and thus reduced exhaust emissions.
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Old 08-07-2008, 07:47 PM   #6
stephenrodas
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Cool thanks.
I am asking because there seems to be a rattleing in that area could this be the problem or may be the vanos.??
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Old 08-13-2008, 06:32 PM   #7
Greek Dinan
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Its probably the DISA. I have the same noise. I probed around with a screw driver. I wedged the screw driver between the manifold and the open area where the little arm goes to the adjuster and put pressure. The noise went away.
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