Hi All,
Got some issues after a dealership did a service and disconnected the battery.... need your collective knowledge to understand what is going on.
Liberty GT, 2010, 160k. Went to the dealership for one of the typical service, got the car back with strange symptoms - engine is shaking on idle on added load like AC compressor turning on or a transmission set to reverse.
With AC compressor, each time when it starts when engine is idling, there is a vibration wave for a couple of seconds. It is quite significant - can be physically sensed by hands on the steering wheel, via the driver chair etc.
The engine looks like choked for these couple of seconds and then comes back to a normal idle work. No such issue on rpm higher than idle.
With transmission put in reverse and the vehicle is kept stationary with brakes or with very slow moving backwards, it is just a high vibration.
I tried to return the car back to the dealership but they unable to actually fix the issue. They somehow increased idle by approx. 100 rpm, so the vibration become a bit less but the issue is still there. They mentioned an adaptation/relearn period after a battery disconnect but after a while the issue is still there. Plus I do not recall any previous battery disconnects did anything like that.
I looked through the internet and did the following but unfortunately that did not help:
a) gently cleaned the throttle - there was a bit of dirt there but not too much to worry about
b) did a throttle idle re-lean ( wait some time after turning ON but not starting the engine)
c) checked for diagnostic errors - nothing found
d) checked transmission oil level - OK
Apart from this vibration, the car drives as it was, no problems with acceleration, no strange sounds, does not look like it has any misfiring. Real time data from ELM327 dongle & Torque looks ok at the first glance.
The works the service did were as follows: change of the engine oil, engine plugs, transmission oil, diff oil.
If someone have an idea where to look next to diagnose the issue please, please let me know.
Thank you in advance and best regards,
ilib11
P.S. If you can recommend a good service in Brisbane for further regular servicing - that would be great too.