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[Webby the Bear]

Webby, if you have an EGR block it.. but dont disconnect.
 
coolant temperature sensor is also critical (v-valley under plenum) if it shows incorrect low values , ecu will always inject more fuel causing rich mixture .. but you can understand this from the spark deposits and exhaust..

thanks cem. how do i block the EGR? And will that improve fuel economy and performance? 

ON the V6, the EGR is to reduce NOX. Blocking will have a mariginal affect on cruising MPG, but makes it a bit more sprightly/responsive.

If the EGR is unable to fully close (it will be full of soot and shite), this will make the car run far from optimally, hence the recommendation to block it if the EGR is suspect.

Thanks guys,

I'm going to go down the EGR cleaning route first before I decide to block it off.

I want to get round to testing all the sensors I highlighted above too. I have learned how to test all of them, mainly using a multimeter but unsure if I can check the MAF sensor (in addition to the TechII checks we did) off the car with the multimeter. Any ideas?

[Webby the Bear]

Also, just for completeness I'm going to (for the first time ever) replace the O rings to the breather bridge/throttle body. I'm going to also replace the bigger O rings between plenum and inlets...anyone got a part number for them? I'm hoping that just being O rings they'll be pence...but stranger things have happened in the odd world of Vauxhall parts depo!

[Webby the Bear]

ps, just part number needed for plenum to inlet o rings