Hi All,

So I've been trying to do some rebuilding on my 190E.

I'm not quite sure where to start but I appear to be having a power/vacuum related issue.

A few weeks ago I replaced:
-Fuel Injectors
-Fuel Injector holders and seals
-IACV Hoses
-AFM Boot

All of these parts were original to the motor and had about 125K on them.

My primary goal was to make the car idle smoother. It had rough and hard at idle.

When I start the car up, engine vacuum sits at about 15". I put the car into drive and it falls to about 12".

I plugged up every vacuum connection on the manifold, with the exception of the brake booster, and it was 15". Putting it into drive nets 12" of vacuum.

I had my meter connected to the X11 diagnostic port during all of this. When I first started out today it was sitting around 70-88%. I adjusted it back to 45-50%.

I reconnected each of the vacuum lines, monitoring the duty cycle and vacuum.

None of them resulted in significant vacuum loss at idle.

HOWEVER

One of them resulted in a significant drop in the X11 port duty cycle. When connected the engine ran rich, in the 30% area. When disconnected/plugged the engine sits in the 45-50% area like it should.

Does anyone know what this line services? I have to dig into the FSM to see if I can find it. Vacuum diagrams are not centralized as much as I would like.






Beyond that issue...

I still have

1) 12" of vacuum in drive at idle.

2) Lots of cranking to start up. I would say 6-10 seconds? Then it meekly starts up and is fine after a second.

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