Where is WOT Switch - PeachParts Mercedes-Benz Forum

shams13 · #1 12-12-2004, 07:00 AM

Can somebody tell me where is WOT Switch, is it different than the kickdown switch??

Is the throttle doing mechinical function (like in carburator cars) or doing electrical, if so then it doesn't matter how much do you open the throttle, this is ECU who will decide to send the amount fuel to the cylenders based on RPM and other things(that i don't know)

230E 89

deanyel · #2 12-12-2004, 12:53 PM

WOTs on second. Who's on first, I don't know's on third.

Sorry, couldn't resist - no one else was answering.

A264172 · #3 12-12-2004, 02:57 PM

Quote:

Originally Posted by shams13

Can somebody tell me where is WOT Switch, is it different than the kickdown switch??

I am not familiar with 202's but my guess would be that it is, as mctwin2kman said, either inside or on the other side of the throttle body. (Behind the items in your picture from that post, and under the air cleaner.)

Quote:

Originally Posted by mctwin2kman

It is too tight. That microswitch tells the fuel system you have the throttle closed and that then brings the idle down to the normal level. If you are not hitting the Downshift Switch you are most likely not hitting the WOT Switch on the throttle body either so you are not enjoying the extra fuel enrichment cause by that switch being engaged either. .

If this is so, when you remover the air cleaner, the switch should be somewhere below the air flow sensor plate at the bottom of the air cleaner, either outside or inside the throttle body.

Quote:

Originally Posted by shams13

Is the throttle doing mechinical function (like in carburator cars) or doing electrical, if so then it doesn't matter how much do you open the throttle, this is ECU who will decide to send the amount fuel to the cylenders based on RPM and other things(that i don't know)

230E 89

I sounds like the WOT is one of those "other things" that sends a signal to the control module to either supply max fuel through the EHA on the fuel distributor or perhaps it acts through the cold start valve bypassing the control mudule?

I would think the kickdown switch would prompt a transmission downshift to maximize the effect of all that extra fuel.

Duke2.6 · #4 12-12-2004, 03:44 PM

Quote:

Originally Posted by shams13

Can somebody tell me where is WOT Switch, is it different than the kickdown switch??

Is the throttle doing mechinical function (like in carburator cars) or doing electrical, if so then it doesn't matter how much do you open the throttle, this is ECU who will decide to send the amount fuel to the cylenders based on RPM and other things(that i don't know)

230E 89

Assuming it's a KE fuel system the WOT and idle switches are incorporated into a TPS (throttle position switch) located at the end of the throttle valve. On my M103 the throttle valve body is located under the fuel distributor. The TPS on my engine is difficult to reach but it has a pigtail with a connector on top of the manifold, so it is each to check switch operation. One lead is ground, one is the WOT signal, and the other is the idle signal.

Duke

mctwin2kman · #5 12-13-2004, 08:20 AM

The WOT is on the side of the Throttle Body. It tells the CIS-E system to give enrichment via the EHA. The kickdown switch operates the tranny kickdown only and does not go to the CIS-E to control enrichment.