So some of you might have seen my recent thread on flogging the vacuum lines. I went to the stealership and they lifted $660 out of my wallet for an inspection. I now know the tread depth of my tires (new) and brake pad thickness (just replaced) and my tire presures (since Bentley owners apparently can't read the TPMS screen.

They also came up with a laundry list of 'broken' items including 'vacuum booster check valve' which they are willing to replace for a mere $489.
Now bear in mind this is a BENTLEY dealership with Bentley certified techs.

Not only is this not a vacuum booster it is part of the EGR/secondary air system.

I only found this out because I insisted they show me the location(s) of the parts they wanted to replace. This part is right on the front of the engine and I expect it may take me 30 minutes to replace. It is just under the front decorative engine closeout.

They also wanted to drop the engine to replace a pressure sensor on the intercooler which thanks to @Johnny Hotspur GT I now know is nowhere near an engine drop

So whether Bentley or an independent make sure you are a Missourian and they show you.

Below are the pix - I having big time vacuum problems - not sure how much this will help given the rube goldberg vacuum system but two big holes like this can't be good. The valve was $16 and it is the same solenoid/valve part number as the turbo boost solenoids.

 

Sorry forgot to show the new valve - you can see that both barbs are broken on the old valve. This is a Bapmic which is some kind of 'Chinerman' company German heritage Chinese now own. Not sure of the quality so would not use on turbo but this is easy enough to get to.

 

Hi all,

I managed to replace this valve notwithstanding a few busted knuckles. There is very little room to work on this area (like there is easy access to anything on this engine ). In particular the single ear crimp hose clamps are a real RPIA as there is precious little room to get any cutting tool at all into this area.
It finally occurred to me that I could drill out the most part of the ear. The crimp tool leaves behind what is essentially a 'pilot' dimple. Once I drilled the better part of the ear out it was easy to finish the job.

So I found out that so far I have have good results.

Before every time I stepped on the brakes the vacuum pump ran for 30-60 seconds. That is now gone. The engine is now running smoothly without hesitation and no stumbling/surging under load. I cleared all the codes and I am now driving the car to see what codes reappear.

I had a ton of codes: misfires on many cylinders, rich fuel, 0455 evap gross leak, check gas cap, etc. these seem to be clear now. I will be driving it to see what occurs.

Bottom line - this valve was totally broken and left two BIG holes in the vacuum system. From the pictures you can see both legs were totally open.

If you are having similar problems you might want to check this item. It is not readily apparent as it is below the front close up panel right below and to the passenger side of the oil filler.

I am not sure how and why Bentley checked this but in retrospect the $660 inspection fee might have been money well spent.

 

hello dear ,

I have an issue with 04 gt

engine rpm always drop down below 500 and some times it shuts off when steering wheel is turned full

and brake is hard vacuum pump is new

so do you think I should replace the intercooler sensor and this vacuum valve ?

 

It looks the same as the exhaust flap valves,
I replaced mine with a VW part

 

hello

thank you for your idea ,

Can I have the part no. or a photo for it please