[V6-12v] Injector Hiss...

[James4ihl at aol.com]

Which O2 codes is it throwing? Some of them (lambda control limit exceeded/ 
not reached - one of the two) can point to unmetered air entering the intake 
manifold after the MAF sensor, which would point to either a leak in an intake 
gasket, or somewhere in the vaccuum system on the intake side... Have you 
replaced the big rubber 'donut' seal that sits between the throttle body and the 
intake plenum - it's pretty notorious? Also, I'm still interested in that big 
gasket that separates top and bottom of the intake manifold, as it does run 
round behind the injector pipe - a leak in the right place on that could easily be 
mistaken for an injector leak...

James

In a message dated 18/04/2004 6:13:06 am, natwhite at mnsi.net writes:


> It definitely sounds like its coming from the driver side, non-FPR side,
> from the injector closest to the radiator. I have replaced all vac lines
> except the one coming from the EGR valve, I suppose that could be it,
> but it sounds like its coming more from the front of the engine.
> 
> This is very interesting, and I am glad I finally found a lead. It has
> been throwing 02 codes, even with two different sets of brand new OEM
> sensors. Codes have been cleared numerous times with VAG tool.
> 
> In addition, there are a few thick rubber hoses around the injectors,
> maybe a hidden leak in one of those?
> 
> Thanks for all the help.