hello all, i have a mercedes W221 with a M278 that has an extended crank with a stored fault for the intake cam adjuster bank 1, the cam adjuster has been replaced, the only way to check base timing are looking through these dumb windows and looking at the pick up wheels for the cam shafts, its not a definite answer to tell if timing is on, but the chain has not jumped time, and my belief is that the cam pick up wheel has spun slightly on the intake cam shaft on bank 1, i will be attaching all the wave forms that i have pulled from the vehicle, it uses a hall sensor for all the intake cams and for the crank shaft. im having trouble uploading the files, can i only do images?
Hello.
If the camshaft disc has a backlash on the shaft, then this would be seen on the waveform or in the scanner values.
In the waveform shown - there is no backlash.
Perhaps this can be seen on the oscillogram of the starter scroll.
The parameters of the camshaft base position should be visible on the scanner in the current data .
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The problem with this engine always starts with the oil pressure.
When starting the engine for a few seconds, there is no oil pressure required for the operation of the hydraulic tensioner and VANOS.
Few people were able to restore the operation of this engine by replacing only one VANOS intake.
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First of all you need to read the TIPS documents for this engine.
Check engine number for installed or not oil check valves in the head block's.
What type of chains are installed.