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The engine is shaking and idling erratically, not vibrating, but shaking. I can see the engine moving erratically from side to side. This only happens at idle, the engine runs very smooth above idle. I have changed the motor mounts and harmonic balancer but no help. I do hear a rattling under the car which could be the catalytic converter. Don't know if that would cause a shaking. Not getting any DTC codes.
Connected my star computer and ran some tests and activation's and it looks normal as far as I can tell. First time using it on my CLK so I'm no expert with it.
Can anyone tell me if this graph looks normal??
edit: Engine is idling and has been running at least 10mins.
If the green and red are primary oxygen sensor readings, then yes, that's normal. I'm guessing yellow and purple are the secondary sensors, Those are normal too. What's the idle speed?
Marcus, the idle speed looked like it was fluctuating from about 641 to 658.
I hooked up the computer again today. Looks like I have some stored codes of
Crank position sensor and load limit active. I remember seeing the CPS code last week
but not the load limit active. Both are stored codes. If there was trouble with the CPS I would think there would be more problems than just at idle.
I tried to follow the tests for load limit active but the preconditions wouldn't pass. Engine oil temp and level's are out of spec. Possibly too much oil in the crankcase? I'll have to look at that next weekend, ran out of time.
11-24-2016, 07:58 PM
