Hi I bought a used r53 7 months ago after owning a new r56 for a couple of years. It's done 100 000 km or 60 000 miles and is stock other than an alta cai.
Today after running fine for 20 minutes I felt a jolt as I was driving and the eml light and engine light came on plus I lost all power, however the engine kept running in what I assume some kind of limp mode. ( I had enough power to drive at about 10kmph). As I was pulling over a burning smell entered the cabin and the engine sounded very rough.
The water temp was fine, and there was oil on the dipstick and the serpentine belt was ok. There is no sign of any obvious problems under the hood. I haven't restarted it yet as I don't want cause further damage.
My question is does this sound mechanical or electrical. The jolt concerns me and the burning smell. What could it be? Big $$$$
If you notice it was smoking and it was definitely a burning type of smoke as opposed to a fluid/water drying off I would expect maybe a sensor wire has bared through rubbing on something and shorted it out, hence now its not sensing and the cars got into emergency mode?
Power steering pump is down the back of engine and not unheard of to start smoking burning, cable/power connector shorting, smell would be more electrical like melting plastic, etc.......can send the electrics into meltdown and affect many other things intermittently. If so don't ignore as a fire can result if battery is left connected while unattended!
It was the harmonic balancer. The rubber part had completely sheared and was in bits and as result also ruined the tensioner assembly. Not happy - would point to crappy part quality. Apparently it's quite common and BMW keep the parts in stock so there was no delay. Plenty of $$$ later and it's all fine!
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