is something missing on my engine? w202

[lars-mad]

Hello i was working under the bonnet on my car today and saw a plug that i think there should be a wire connected to see pic and yellow arrow
please help


Lars

 

[lars-mad]

anyone?

 

[momomo]

Do you think you could upload a picture reduced size? Its hard to make out as its too large.

 

[lars-mad]

ok

 

[lars-mad]

Do you think you could upload a picture reduced size? Its hard to make out as its too large.

done

 

[horgantrevor]

Not sure from pic

But is the car running ok

Their may be several items in engine bay used for testing

They may only be need then

 

[lars-mad]

the car is running okay but misfires sometimes when i have been on a red light and are driving on green the engine has been rebuilded summer 2010

Lars

 

[lars-mad]

it looks like a sensor of some kind but i do not know... only had the car for about 3 weeks

 

[horgantrevor]

I'll look into it and get back too you tomorrow if that's ok

As They say Ill be back

 

[lars-mad]

I'll look into it and get back too you tomorrow if that's ok

As They say Ill be back

That is great thanks

 

[grober]

Its the camshaft position sensor item 23 so should be connected for best engine performance. The unit below it is a knock sensor.item 47 There should be a bit of unconnected wiring loom kicking around somewhere in the engine compartment.

 

[lars-mad]

Its the camshaft position sensor item 23 so should be connected for best engine performance. The unit below it is a knock sensor.item 47 There should be a bit of unconnected wiring loom kicking around somewhere in the engine compartment.

then i have to start looking for the wire for it can it be the reason it misfires sometimes?

 

[CompR]

Cam sensor, makes Kompressors go in to limp-home mode with SC disengaged, no idea what it would do to a normal car, but it wouldnt give top performance.

Wire should be fairly noticable, it is in the usual plastic covering as standard.

 

[lars-mad]

Cam sensor, makes Kompressors go in to limp-home mode with SC disengaged, no idea what it would do to a normal car, but it wouldnt give top performance.

Wire should be fairly noticable, it is in the usual plastic covering as standard.

will try look for it... as i said earlyer the engine has been rebuilded complete summer 2010 can it be a good reason why it is not connected? dont want the engine to blow or something if i find and connect it

 

[grober]

then i have to start looking for the wire for it can it be the reason it misfires sometimes?

The engine management system controls both fuelling and ignition on these cars. While the engine ECU uses the crank position sensor CPS to monitor engine RPM and ignition firing the ECU uses the camshaft position sensor to fine tune fuel injection timing in relation to valve opening. In an engine with fixed valve timing the relationship between crank and camshaft position is fixed via the timing chain and sprockets. However in engines with variable valve timing such as the 111 engine [ inlet only] this relationship can vary. Hence the need for the fuel injection system to know more exactly when the valves open. It might explain your symptoms. However if the engine doesn't have variable valve timing- some 180's don't - then this parameter is not strictly required so perhaps explains why the car still runs without it.
Best to get it wired up again.

 

[lars-mad]

The engine management system controls both fuelling and ignition on these cars. While the engine ECU uses the crank position sensor CPS to monitor engine RPM and ignition firing the ECU uses the camshaft position sensor to fine tune fuel injection timing in relation to valve opening. In an engine with fixed valve timing the relationship between crank and camshaft position is fixed via the timing chain and sprockets. However in engines with variable valve timing such as the 111 engine [ inlet only] this relationship can vary. Hence the need for the fuel injection system to know more exactly when the valves open. It might explain your symptoms. However if the engine doesn't have variable valve timing- some 180's don't - then this parameter is not strictly required so perhaps explains why the car still runs without it.
Best to get it wired up again.

it is a 200 engine that is rebuilded the last owner said so the engine has been swapped at some point

 

[lars-mad]

it is a 200 engine that is rebuilded the last owner said so the engine has been swapped at some point

cant find the wire where should it come from?

Lars

 

[grober]

It should lead back the engine ECU through the engine wiring loom which will have many connectors leading off it. It will be in small rectangular cross section black plastic ducting you see in the pictures you posted. If the original 180 engine wiring loom and ECU has been used the wires may be missing since they were never incorporated in the loom for the 180 engine [ no camshaft adjuster] The only circuit diagram I have pin 2/19 Br/Gn wire and pin 2/8 Ge/Gr wire to the ECU plug and Rt/Bl wire to earth from the sensor.

 

[lars-mad]

It should lead back the engine ECU through the engine wiring loom which will have many connectors leading off it. It will be in small rectangular cross section black plastic ducting you see in the pictures you posted. If the original 180 engine wiring loom and ECU has been used the wires may be missing since they were never incorporated in the loom for the 180 engine [ no camshaft adjuster] The only circuit diagram I have pin 2/19 Br/Gn wire and pin 2/8 Ge/Gr wire to the ECU plug and Rt/Bl wire to earth from the sensor.

ok can i make a new wire from the ecu to the sensor then if it is not there? today the car is misfiring much more than earlyer :S

 

[grober]

There are many possible reasons why your car is misfiring. The high tension circuits can fail coils or leads [ quite common] Low tension wiring insulation can go brittle due to engine heat and short out [ again quite common] this often happens after an engine rebuild when the wiring is disturbed. If the car was running OK for a time after the transplant I doubt you problem lies with the lack of connections to that sensor. Most likely to be the coils or associate circuitry. Its very difficult to advise on a car that's non original since its almost impossible to know what's been replaced and what's original. However experience would indicate problems with the IGNITION CIRCUITRY are the most likely causes of your problems.