cracked manifold replaced - need more pointers on what to check next re low boost

[omodos]

Originally Posted by wpoll

Had a look through my photos and found a couple of images of my engine that show a normal charge pipe to EGR connection (first image) and a leaking charge pipe to EGR connection (second image): -

(Click on each image for larger version)

Good charge pipe connection...


Poor charge pipe connection...


In the lower image, the charge pipe gasket had been pinched and the charge pipe was not seated correctly. The fault was evident from the oil blow-by on the outside of the EGR body.

The charge pipe seals are pretty thin, soft and easily damaged...



HTH...

cheers buddy

[omodos]

Wayne hola, hope all good, is my logic floored here? what does removing the vac line from the egr side of things do>? stops the actuator for egr working and the egr valve stays open or closed accordingly as such ? i removed the vac line from the side nearest to the egr and it made no difference to boost, so would this point to the actuator closest to the turbo possibly being the issue? on another note look at what where this russian fella nailed the actuator, to be frank makes much more sense than where it is located now ....

[grounch]

I replaced this actuator next to turbo, no change.
The best solution would be someone revving the engine to the whistle point while you inspect the engine bay, so you can figure the area of the leak. Will try that soon

[Clavurion]

Originally Posted by omodos

Wayne hola, hope all good, is my logic floored here? what does removing the vac line from the egr side of things do>? stops the actuator for egr working and the egr valve stays open or closed accordingly as such ? i removed the vac line from the side nearest to the egr and it made no difference to boost, so would this point to the actuator closest to the turbo possibly being the issue? on another note look at what where this russian fella nailed the actuator, to be frank makes much more sense than where it is located now ....

When vacuum hose on EGR valve is removed the valve will stay in closed rest position. This will not affect turbo vacuum actuator as long as the removed vacuum hose is blocked so the rest of the vacuum system has proper vacuum supply.

[omodos]

Originally Posted by Clavurion

When vacuum hose on EGR valve is removed the valve will stay in closed rest position. This will not affect turbo vacuum actuator as long as the removed vacuum hose is blocked so the rest of the vacuum system has proper vacuum supply.

Hi clavurion yup forgot to mention that i plugged the hose vacum hose temporarily with a screw...and made no difference to boost

[omodos]

Originally Posted by Clavurion

When vacuum hose on EGR valve is removed the valve will stay in closed rest position. This will not affect turbo vacuum actuator as long as the removed vacuum hose is blocked so the rest of the vacuum system has proper vacuum supply.

I see ironically enough though as i mentioned its since the absence of the wheezing/ whoosh sound at lower revs ie 1500 and up went that i noticed the lack of boost at lower revs...and
As wayne mentioned its a noise you get when easing off of pedal as turbo releases excess pressure
..anyhow will get to bottom if it oneday

[wpoll]

The only way the EGR valve will reduce boost is if it is very choked with carbon - which does happen in some cases (lots of cold, short runs). I'm guessing your mechanic checked/cleaned this during the exhaust manifold replacement (or it has been checked/cleaned at some other time).

They normally look like this (on the left) and after a clean on the right...



When left too long....

[omodos]

Originally Posted by wpoll

The only way the EGR valve will reduce boost is if it is very choked with carbon - which does happen in some cases (lots of cold, short runs). I'm guessing your mechanic checked/cleaned this during the exhaust manifold replacement (or it has been checked/cleaned at some other time).

They normally look like this (on the left) and after a clean on the right...



When left too long....

Ok fella , mechanic probably did the minimum when I took it in, i asked for the manifold to be replaced and a cv boot, and also did mention that was low on boost and he said he would check the hoses etc...i guess after all the digging and seeing there is only one clip to remove so hose to egr can be released i can check myself...just got a bit lost, thought disabling so to speak the egr valve by blocking the vacum hose from the pressure converter/actuator to it .....resulting in no change in my boost meant the egr side of things is the issue....

[omodos]

Wayne been a while hope all is well, right 10june day off for me and also my birthday yup getting long in the tooth, and needed to pick something up from out of town, road and scenery & weather combined with the correct music made me floor (nearly) the x5, for a couple of mins....low and behold my characteristic low pitch whistle came back! accompanied by boost at sub 2000 rev range ! dunno for how long it will be the case but jeez what the hell could have 'fixed' this?
PS 4 days down the road still ok

Originally Posted by wpoll

The only way the EGR valve will reduce boost is if it is very choked with carbon - which does happen in some cases (lots of cold, short runs). I'm guessing your mechanic checked/cleaned this during the exhaust manifold replacement (or it has been checked/cleaned at some other time).

They normally look like this (on the left) and after a clean on the right...



When left too long....

[wpoll]

Another Gemini - me too!

Sounds like you've done an "Italian Tune-Up"...

Given that the level of boost is controlled by the VGT (VVT) system, maybe the actuator was jammed but has freed up somehow..

Can't see how but I can't think what else could account for a sudden change.