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Does anyone know what the Mode 6 values in Torque refer to?
I have the left bank of my car misfiring and and after a one hour drive here are the misfire counts on Torque
Cyl 1 0
Cyl 2 0
Cyl 3 0
Cyl 4 2
Cyl 5 13
Cyl 6 29
Cyl 7 324
Cyl 8 21
The only thing that flagged to me in live data was
MID: $36 TID: 84
Min 6.14 , Max 27
Current Value 1.4
This was highlighted as out of range. However, on a refresh it would be within range. Does anyone know what this value is for?
I also got live data with the car and noted the "camshaft position exhaust left" fluctuates wildly, from a negative value to a very positive value, up to +14. If I compare the values to camshaft positon exhuast right, they are wildly different and tend to stay negative.
The following video is at 1200-1500rpm
Spark plugs are brand new, Injectors and coil packs are new. O2 sensors are new.
Compression test was good, so was a leakdown test.
Misfire happens at 1200-1500rpm in that range. When the car is first turned on in a cold start, there are no misfires , especially if I keep it driving under 1500RPM. Once I start to drive normally, the misfire count will go up on cylinder 7 at the 1500rpm mark. Past 1500RPM, the misfire dissapears.
I have no fault codes.
This all happened after a headbolt install
Questions:
1. What is MID: $36 TID: 84 measuring?
2. If I unplug the connector to the left intake or exhaust camshaft adjuster , will the car still run, or is this a bad idea?
3. Does a "camshaft position exhaust left" mean that the camshaft adjuster is bad, or the exhaust cam position sensor? I can easily swap the left and right cam position sensors.
I don't think that's possible. Im just wondering if I unplug the cam position sensor or the solenoid and run the car, it would disable the cam adjuster and somehow bypass it .
I don't know if it's possible or safe to do but you'll need to eliminate options when problem solving. generally speaking you cannot by computer lock a position but for instance for Audi's you can monitor requested and actual. if those differ you have an issue with a part of the mechanical system.
along with that start up has a set value and after stable idle you have another set value so in monitoring if they do not reach those marks than the timing adjuster is faulty.
we need a Mercedes master technician to assist with appropriate diagnosis here.
Ill see if I can actuate the cam adjuster by supplying voltage to the cam solenoid.
This may or may not work
Otherwise Ill try to start the car with a disconnected cam solenoid to see if it can not activate /bypass the adjuster.
Also will try to disconnect the cam position sensor. Im sure it will still run disconnected.
There are 2 connectors to the intake and exhaust cam solenoid.
Am I correct in assuming these adjust the cam adjusters?
When I disconnect the exhaust solenoid, there is no misfire.
However, when I disconnect the intake solenoid, there is also no misfire.
I guess it must be the cam adjusters causing this misfire then? The 2 must be linked or if one solenoid is disconnected, both the exhaust and intake must go into a default value.
Currently driving with the car with the exhaust solenoid disconnected. The rattle noise seems to have reduced too. Misfires are gone . Is it safe to drive with the solenoid disconnected ?
disconnecting would only assist with identification of the problematic adjuster/solenoid. without understanding the full sweep and operation of the adjustment range and behavior I would not advise driving the vehicle as so.
if you're able to get confirmation from someone who has this information, drive of low RPM shorter distances should be fine if they deem it safe.
solenoids should click if any noise but usually are quiet and shouldn't tick. if a solenoid is bad you'd lose function and receive a code I would assume.
camshaft adjusters are known parts that wear out over time. start with those. they are a known failure item.
honestly speaking someone should be able to tell you the correct diagnosis and monitoring of them using Star/DAS if you are wanting to be 100% sure. in either case that video shows and sounds like they're no good.
better yet...have you done an engine flush and then replaced your oil with something good? that helps a lot but doesn't solve an issue if your adjusters are really dead. btw, they sound bad/dead.
OK Iv got more data for analysis, before I go out and buy some adjusters?
-With the Left intake solenoid disconnected, The left camshaft position is stuck at 28 degrees. The left exhaust camshaft position does not line up sometimes with the right camshaft position. Timing of the R and L bank is the same. No misfires
- With the left exhaust solenoid disconnected. The left exhaust position is stuck at -15degrees. The left intake camshaft position is pretty much the same as the right intake camshaft posiiton. Timing of the R and L bank is the same. No misfires
Now, this leads me to hypothesise that the left exhaust solenoid or the left camshaft adjuster has has issues.
If this is true, shouldnt the car still misfire with the left intake solenoid disconnected, as the left exhuast camshaft is still giving erroneous values? Is there anything else that is switched off or disabled when the a camshaft solenoid is disconnected?
09-03-2019, 11:22 PM
