Engine Shaking at Idle

In bar the pressure is set to 2.0 bar per the spec and the oscillations are 1.79 bar to 2.13 bar, approx.

In general are oscillations in this range in the fuel pressure expected in a D-Jet system?

What are your thoughts on the ripple to the fuel pump? Can such a ripple affect the fuel flow and therefore affect injection in a D-jet system?

I've updated my original post to add item J18 which I missed off.

Thanks, Andy

Hi,

I believe you see more the shaking of the engine than such high ripples on fuel pressure. It is not normal.

OK, thanks. I don't want to just replace expensive parts in the hopes it will fix it so is the problem caused by the fuel pressure regulator or the damper (in the engine bay)? How can I tell which it is and how can those components be bench tested?

Thanks, Andy

Hi Andy,
what about trying to connect the pressure regulator directly to the return line?
Does this have influence to the pressure oscillations?

Regards
Norbert

edit: There is no need to bench-test regulator and damper. The regulator is part of the fuel-pressure-line, the damper is in the return line. There is a hose between them that can get clogged because of the low angle it is bent to.  

Hi Norbert! Good to hear from you!

So I should try passing them through my ultrasonic cleaner? Fuel hose was all replaced three years ago.

Thanks, Andy
 

Hi Andy,
I don't think a cleaning will 'repair' a defective regulator or damper.
Just remove the damper to find out if this has has an effect.
<There is no absolute need for the damper. There are D-Jetronic-cars without this device.>

Regards
Norbert