This is a weird A/C Rev's issue!!!

[Paul_A]

Uh Oh... Phil,
That sounds awfully familiar...
That's exactly how mine started out.... Intake gaskets.
I don't think it's relevant how many miles the engine's done... it happens.
And yeah.... It's a PIG of a job!
Hope you had a warranty on it.....
Wish you were a bit closer so I could have hooked it up to my code reader/laptop.
BTW "Easy Start" seems to work better than carb cleaner to test.
I just thought... before you go wasting money (like I did) on Tps's and Iac valves why don't you pop your phone number on a p.m. to me ... I can likely help you figure this out.

[fildigger]

An Update......

Took the battery terminals off, replaced 10 mins later and the CEL is now OFF

Ran the engine on tickover and sprayed 'Easy Start' around the whole of the inlet manifold...There was no change at all in the idling of the engine

So, after this, I fired her up this morning and went on a short shopping spree...the VX is idling fine! no hunting ! and no surging when decelerating !!...I'm pleased but still sceptical

Took her out again this afternoon, for a longer and more spirited drive and everything is absolutely fine !!

OK, so some threads/posts on here state that this erratic idle situation can suddenly disappear and then all of a sudden come back...

...with this in mind i thought i would set to and have a poke around under the hood.....Now i just happen to have from my Diesel days a can of Wynns EGR cleaner...here,,
http://www.wynnoil.co.uk/products-wy...gr3-diesel.htm

Before you say anything, i do know the V6 is a petrol engine ....this stuff essentially does what a carb' cleaner will do but maybe in a more aggressive way.

Took the IAC valve off, exposed the throttle body butterfly and removed the PCV valve...they all got a good dose of the EGR cleaner and are now looking like new (to the eye)....bolted everything back up, then opened the air filter box, ran the engine and squirted copious amounts of the stuff in the air induction pipe to clean the MAF (it does say on the can, ideal and safe on Air sensors)......

...Went for yet another run out and it's running like a dream ..So the erratic idle MAY be sorted !!!!!

I am not going to get over confident here!!!...will be going to work in the VX tomorrow and i will be hitting the A/C button (temp' on minimum) while at speed and see if the wierd dropping a gear down to 3rd happens again when the A/C compressor kicks in!!!

I'll Be Back