Two Signals Disconected. What Are The Effects?

[MARIO FARIAS]

Please, Watch the pictures of a 190E engine section. The Yellow broken electrical connector to the left is a line coming from a sensor located in front the engine. I think it is taking some signals from the crank shaft. In my M.B. 300E, 88, it is coneccting to the round test socket.

The gray to the right is an opened vacuum line. In my 190E the line out was eliminated. In the 300E a vacuum line is coneccted to the gray opened point and go inside the car passing side the fuse box.

Please tell me what are the effects of these disconeccted lines.

What is this sensor and How to test it?

Where have to go the vacuum line? Can It affect the idle or another divice?


Thanks

MARIO FARIAS
LAPREFAR@CANTV.NET

[psfred]

The front crank position sensor (the yellow wire) is a diagnostic tool, the sensor the engine uses is on the rear at the transmission bell housing.

VAc line is probably AC or for the "economy" guage on the dash.

Peter

[MARIO FARIAS]

THANKS PSFRED. The economy gauge is working, but I don't if this vacuum line is for AC.

Any way, I think that we are lossing vacuum pressure. Can it affect the idle?

What about this sensor? How test it? How to conect to the round test socket?

Thanks


Mario Farias
laprefar@cantv.net

[psfred]

Mario:

A broken or disconnected vac line will cause all sorts of idle problems -- miss, vibration, hesitation, and harsh transmission shifts. Plug the line if you cannot find what it goes to.

I cannot load the pic, so I cannot tell exactly where the line goes. What color is it, and does the plastic line have a color stripe also?

The sensor is just for use with diagnosic equipment plugged into the X11 connector on the firewall, I don't think it is connected to the in-car computer at all.

Peter

[MARIO FARIAS]

tHANKSFOR YOUR ANSWERS.

hERE is a new picture.

The yellow electrical conecctor, to the left, is the line coming from the crank position sensor. It has 3 leads but I don't know what is the order to conect each one to the X11 test plug.

What is the importance of this sensor.? How to test it?

Tha Vacuum line to the right, is on of the two exits from the check valve.

The main vacuum line is coming from a double vacuum point on the head cilinder. The first vacuum line goes to the check valve with 2 exits. One of them is conecting to go down the AIR FLOW CONTROL and the another exit from the check valve is the lost vacumm line. The second vacumm line from the head goes directly down to the AIR FLOW METER too, close to the previuos conection.

I note that the double vacuum point on the head produces vacuum pressure only when increase the RPM, but not at idle.

What is this vaccum line lost?

What are the importance of this vacuum lines?

Thanks
Mario farias
laprefar@cantv.net

[psfred]

Mario:

The crank position sensor is only a diagnostic tool, and if you don't have the MB tool to plug into the X11 socket, you cannot use it anyway. There should be a place to plug it though, I will look on the TE and see if I can figure it outl.

The "lost" vac line should be connected to the throttle body with a "y" fitting that only has vac when the throttle is open. On the right side of the pic is where it goes, in the large hose-to-small-hose fitting. This is the charcoal canister evaporative control purge line -- pulls the vapors off the charcoal canister through a calibrated orifice only when the throttle is open. Will check that too, it's the same on the TE.

Peter

[400E_FAN]

One of my 400E's vaccum lines that appears to match the discussion in this thread, I found broken when I was taking apart the power steering reservoir. Can anyone please enlighten me as I am very ignorant to what this is for and it appears to have been out of commission for quite a while. I have no detectable symptoms of ill-effects....but I bet they did not put in there for the fun of it.

The vaccum line comes out of part # 013-545-63-32. (Siemens) if that helps...

And can I order replacement vaccum lines through Fast Lane or is this more a dealer item??? And any particular procedures to replace this line..

Thanks

[400E_FAN]

Anyone got any pointers? Before I head
down to the dealer I just would like to be able
to understand the approach...at the very least

Thanks.

[400E_FAN]

The local dealer had the vaccum line in stock so I replaced the line but cold not hook it up
in the intake manifold side boot. There is a broken piece inside the boot that I cannot figure out how to get out. Anyone have experience in getting that out?

[400E_FAN]

Had to make a small cut in the boot. Then was able to get pick to hook into the broken plastic (pieces) and pull them out one by one....Took a while but new vaccum line meant that my idle from cold start is smooth as silk.