Re: [tech] injectors

[John Erickson <amigos@elp.rr.com>]

The injectors are sealed in the inserts top and bottom.  The air coming from
the airbox appears to be used to reduce heat soak only.  The air comes into
the manifold, goes around the injectors and then is released into the
plenum.  Unless there is a leak somewhere, I don't see how this could effect
your idle.  Maybe I'm way off here, but I have been unable to find any
technical documentation on the air shrouds.

-- 
John
'00 Jetta GLS VR6
'87 Scirocco 16v
 + El Paso, TX +


"Sal"  wrote:

> Motor: 16V
> 
> I think that I've found the cause of my bad "misfire" under 3000 rpm.  It
> seems as though air is not being sucked in by the injectors.  In particular,
> the air shrouds appear to be clogged.  The hose which provides air from the
> air filter and goes to the head between the intake runners #1 and #2 does
> not suck in air.  In fact, when I disconnect the hose at the air filter, the
> car idles fine.  I tried blowing into the injectors and it seems like no air
> passes through the shrouds.  First off, can this be causing my "misfiring"
> under 3000 rpms and sometimes bad idling?  Secondly, can I rebuilt these
> injectors or have they bitten the dust?
> 
> I'm thinking that under 3000 rpms the injectors are relying on the air
> shrouds to provide air but once the second butterfly opens up, additional
> air is being thrown into the motor anyways.  Hence, causing the "misfiring"
> symptons under 3000 rpms.  has any one else come across this problem?  TIA
> 
> Sal





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