Missing tubing? Manifold sensor? Turbo sensor? Fuel Reg?

[RossoDiamante]

Had someone looking in the engine bay yesterday and noted that it appears there are two places where there appear to be missing (vacuum?) tubing or caps. He suggested one may be the intake manifold pressure sensor or some sort of sensor for the turbos and one maybe the fuel pressure regulator. Each appears to have a connector that should have something attached but they are currently naked.

Can someone compare to their engine bay? It's a 2007 m400 chassis #173.







First picture shows the exposed connector to the right-center of the image.

The second picture shows the exposed connector in the middle. It lies underneath the piece with the big white sticker in the first image.

P.S. Help with terminology/orientation is always appreciated.

[YellowShed]

Nothing missing on either of those two - they're intentionally open. The boost control solenoid is meant to dump to atmosphere to control boost, and the pressure damper on the fuel rail is not connected on these engines.

YellowShed

[AMG Merc]

...and he should know

Trevor.

[RossoDiamante]

Interesting. I'll keep looking around to see if anything else is amiss. The car is definitely driving a bit better since delivery now that it is being exercised regularly.

[Adrian W]

odd response, Yellowshead just told you there is nothing "amiss" I would have gone with "thank you"

[RossoDiamante]

My apologies for not adhering to the expected level of manners and consideration. Thanks for allying my anxieties about the open ports. It has obviously perplexed many souls as I've gotten several replies stating that it had them fooled as well.

But I am still left with the question of why the motor doesn't run "quite right". Still hoping that it's a matter of running it a bit more. Put some fuel injector cleaner in last night. Perhaps that will help out.

[Adrian W]

Where are you geographically ?

[RossoDiamante]

Adrian W said:

Where are you geographically ?

Washington, DC.

[Adrian W]

Ah, so not going to be able to get it to one of the normal places, even Turbohoses is a long way, are you a member on the U.S. Forum?,

I would start by changing the spark plugs, it can make a huge difference, also check that the pipe under the throttle body has not been pushed in to far, this will affect idle significantly

Or Pop into your local Noble/Rossion dealer

Edited by Adrian W on Wednesday 14th October 08:46

[andygtt]

Adrian W said:

also check that the pipe under the throttle body has not been pushed in to far, this will affect idle significantly

this is the pipe to the right and just below the plug with 3 white wires in your top picture... as Adrian says this makes quite a difference if its shoved on too far.

What are the symptoms of your port running as you are quite vague about the issue