W124 -300te-24v Vacuum lines and occasional stutter at low rev acceleration.

[boomtings]

Vacuum lines seem to always cause me problems on my cars.
The car in question is a grey turbo technics 300te 24 which I now own. Its strange with half AMG bodykit (missing front bumper) and carat duchalet wheels.
History shows it probably once had AMG rims and a different suspension as wheels and sportline suspension was refitted for a softer ride. Anyway im definetly going to get some AMG wheels and ive got a AMG front bumper waiting to be fitted.

Ive been applying some TLC to this car as it seemed it had been lackin it since the primary owner (93-06) .

Ive sorted most age/heat related failures on pipes etc where gaffer tape was previously deemed a better fix. The cars running 100% better then when I got it but still occasionally feels like it does not want to accelerate below 2000revs, releasing the accelerator and repressing seems to make it work. The car drives excellent otherwise.

Any clues? could this be related to the EHA valve?

below are some other vacuum line issues ive spotted that i need to sort but have not identified answers for.

I cant seem to find any info on where the the vacuum line from the fuel pressure regulator goes?

I also found this vacuum switch behind the brake servo that does not appear to have an lines connected to it. to me it looks like its missing two vacuum lines (one not visible in photo).

And lastly I found a blue vacuum line coming from above the rear of the gearbox and going towards the engine bay, I pulled it through and was able to photograph it near the throttle linkage.

appreciate any help.

 

[neilrr]

Is this the Maidenhead car?

Any chance you could resize (i.e. downsize) the pix?

 

[boomtings]

Resized.

This was the maidenhead car.

 

[grober]

The vacuum line from the fuel regulator should go to the inlet manifold after the air sensor plate. If your car is "turboed"then it may be left off deliberately? The same might apply to the blue line from the gearbox area which may have lead to the vacuum switch with missing connection pictured. This could be on the vacuum line from the inlet manifold which moderates gear changes. The solenoid valve isolates this vacuum to change gearchange characteristics -again may have been disconnected after the turbo conversion?

 

[boomtings]

ill try and look up the kickdown system to see if that involves a vacuum line.
I know there is a gear shift delay valve which im familiar with and appears ok.

With regards to the fuel pressure vacuum line, can i tee off any vacuum line coming of the inlet manifold?

 

[grober]

ill try and look up the kickdown system to see if that involves a vacuum line.
I know there is a gear shift delay valve which im familiar with and appears ok.

With regards to the fuel pressure vacuum line, can i tee off any vacuum line coming of the inlet manifold?

As long as it comes off the manifold after the throttle butterfly plate.

 

[boomtings]

Pierburg 7.21071.00

the switch that has nothing connected is a Pierburg 7.21071.00 component, cooling this only results in post related to a diesel 190 , does anyone know what this part is for?

Thanks.

 

[grober]

If you mean the item in picture 2 Its definitely a electrically operated vacuum valve. It may be operated by the E and S switch beside the gear shift lever which changes the way the gearbox operates. One way to test this would be to monitor any voltage going to it. The valve "state" should change when you operate the E/S switch thus confirming its function? It may even be possible to confirm this by touch alone simply putting your hand on it and getting an assistant to flick the E/S switch- ignition on/engine running.