2015 Ford C-Max, manual
52k miles on the clock.
For almost 12 months I've been getting intermittent rough idling and power drops, and it always throws up the OBDII code P0016 (camshaft position sensor correlation). I've had my belt+water pump replaced, both cam sensors replaced, and regularly get my oil and filter changed with oil flush.
My mechanic says the next step could be to change the crankshaft sensor, but doesn't want me to spend any more money if the car is still running okay (it runs fine and smooth most of the time). I also found a YouTube vid that explained it could be the oil control valve.
Here's an odd thing though - the issue only seems to happen when I use the aircon. If I don't use the aircon, it doesn't happen. But we can't figure out if/why this could be the cause. What could be happening?
My mechanic says the next step could be to change the crankshaft sensor
Shouldn't his next step be a thorough analysis of live data?
I've had my belt+water pump replaced, both cam sensors replaced,
That engine has a timing chain. If the camshaft sensor is not in sync with the crank sensor it could indicate the timing chain has stretched out of specification.
Here's an odd thing though - the issue only seems to happen when I use the aircon. If I don't use the aircon, it doesn't happen.
That puts an additional physical load on the engine and electrical load on the electrical system.
Thank you for the reply Chuck Tobias.
It is definitely a belt driven engine. Specifically it is a 1.6L Duratec Ti-VCT engine. The teeth hadn't been jumping, but the belt was visibly perishing, which is why it was changed.
Regards the load increase from the aircon, surely there must be more to it than just that? Otherwise everyone would get the MIL when they used their aircon.
I'll ask them to monitor the system when I see them tomorrow. Thank you.
Rockauto.com shows that car having a 2.0 engine with a timing chain - but that's U.S. specification. I didn't notice at first that you're talking about an overseas spec vehicle. I wonder if the belt is off by a tooth? That would throw off correlation between the crank and cam sensors. It should show up in the data.
As far as the air conditioning when everything else is working properly the additional load is not a problem. It can be when there are engine or electrical system issues.