Inlet to Plenum O rings: 9118135,

Know what you mean TB but .............


Ever since I finally got round to putting the long nose plenum / 3 ltr ecu on it, the instant comsumption on the MID has been a little high at idle  ( about 0.3-0.4 ltr per hour )

Before then, it was a 3 ltr block with a short plenum / 2.5 ecu.

I have checked for air leaks
Clamped of the ICV pipe and it stalled so I was thinking that a little air was creeping in via a seal somewhere 

With the short plenum, it sat at 0.2 when the engine was warmed through 
0.3 with the air con on.

They are no starting / running issues with the engine. It runs sweet and very quite 

Hence i was thinking of a worn seal somewhere 

Since it is all going to be pulled apart, i thought i would try and get to the botton of this at the same time  

tigers_gonads wrote on 05. May 2011 at 17:36:

Is this what you were after?

Breather bridge to plenum seal 1 off required - 90467543

Quoted from the breather cleaning how to guide.

It is item 42 in this parts diagram as referenced from the very useful GM Parts Giant site that gives you most of the part number

As you can see, in the USA you don't need to pay the full retail price of $0.40 because they offer it at a deeply discounted $5.92 

Hi Steve,

I was wondering whether the ECU might be a bit confused? Reason is that it came from a '99 3.0 Auto Estate and is actually operating in a '97(?) manual IIRC.

Just an idea.

Are there any differences? I don't know, I'm just asking.

HTH - Rob