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Discussion Starter #1 (Edited)
Hello.

I am a new member of this forum, and soon would be in trouble. I have a -95 S600 w140 mercedes engine which I have done remodeling. The motor worked fine 3000 km distance. but now when it reaches normal operating temperature is lost from the 6 and 11 injectors signals.

I have studied it for several weeks now and I have not found a fault.
I've made a new wiring harness for the engine. and reviewed numerous and while a number of items. I have measured all of the sensors. All the readings of the condition. and give the correct signal. Measured the control units, wiring etc..

I removed all the old fault codes from the engine and the starter again until reached the normal operating temperature

Again gave a fault code "14 Closed throttle position switch contact"
I used to open the throttle switch and got it to work, and then managed to reset the fault code off.

But the engine is not running on all cylinders still do not. Still lost injector signals 6 and 11 cylinders when the engine reaches operating temperature.
New fault codes should not be recorded. And less than 75degree engine works just fine, works on all cylinders.

I'm sorry bad english. I used the Google translator:)
It would be very nice if I find help here.

T. Mika from Finland
 

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The motor worked fine 3000 km distance. but now when it reaches normal operating temperature is lost from the 6 and 11 injectors signals. T. Mika from Finland
Look into the Camshaft sensors. the right cam sensor controls the right head, the left sensor controls the left head.

My bet is that the sensor is falling out when you get up to temp.

Nokka-akselin anturi on sivussa, joka ei toimi. Cam anturi 6-11 epäonnistuu.
 

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Discussion Starter #3
I was in that inspects a perception that when I unplug the camshaft sensors as the engine is running at normal operating temperature for all cylinders.

But does not respond to the accelerator pedal so easily and does not give all the power out of the engine.
And the motor may shut down at crossroads
 

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OK, run the codes. What do you have for codes?

The cam sensors tell the engine computer when to fire the injectors.
 

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Discussion Starter #5
It should not be any new codes.

Base Module (BM) - No fault found
LH Sequential Multiport Fuel Injection (left+right) - No fault found
Distributor Ignition (DI) (left+right) - No fault found
Electronic Accelerator / Cruise Control / Idle Speed Control (EA/CC/ISC) w/ASR - No fault found
Anti-lock Brake System (ABS & ASR) - No fault found

Are there any other engine fault code possibilities?
 

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It should not be any new codes.

Base Module (BM) - No fault found
LH Sequential Multiport Fuel Injection (left+right) - No fault found
Distributor Ignition (DI) (left+right) - No fault found
Electronic Accelerator / Cruise Control / Idle Speed Control (EA/CC/ISC) w/ASR - No fault found
Anti-lock Brake System (ABS & ASR) - No fault found

Are there any other engine fault code possibilities?
Put the left sensor into the right bore and the right sensor into the left bore. See if the problem follows the parts.
 

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Discussion Starter #7 (Edited)
Does not change even if I changed the camshaft sensors with each other.

The same symptom... 6. and 11. injectors not working when engine comes normal running temperature.
 

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Discussion Starter #8
Both camshaft sensors provide such a signal out.









Did not show any regular signal.
Why is the polarity of the signal changes back and forth all the time?

Still google translator. :)
 

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I'm not familiar with this scope, but it maybe just a sampling rate problem. Also screen resolution isn't high judging from the pictures. So don't let this scope to confuse you.
Do you have access to Diagnostic Manual? Here is one page for you with signal patern for the Cam position sensor.
 

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Discussion Starter #11
Today I tried to change the camshaft sensor on the contrary
1. controls the left side and 2 the right.
Now the engine is runs smoothly on all cylinders all the time. but does not give full power out.

The same result when you take the sensor wires completely off. but if the sensor wires are completely off so it is difficult to start.
 

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Discussion Starter #12
I Forgotten updating this topic.

S600 now works very well.

I'm getting Star scanner, and examine the car and found a fault.
"ignition voltage" too big 4. 6. and 11 cylinders.

Engine had already been changed to the new distributor caps and plugs.
I measured in addition to all of the plug caps and the fault was found.
Wire resistance should be 2kohm but I found three plug caps with a resistance of more than 10kohm.
Which is caused by a bad spark.

It caused a "ignition overvoltage" ignition coils primary circuit.
due to a fuel injection control computers cut off injector signals to protect the of cylinders and catalysts. :D

I replaced the broken wires and the engine works perfectly again.
 
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