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CAN Bus does not work in an analog way by changing resistances, it is a digital transmission bus and among many other informations the position of the buttons is transmitted.
Obviously for your Android to have that information it must also be connected to the CAN Bus
Keep in mind that in modern cars there is no longer a cable for each button, lamp or function, the devices communicate through digital communication, the most used system in cars is the CAN Bus
Surely they didn't mount the chain correctly, they skipped a tooth on a sprocket, some camshaft works out of phase.
Go back to the shop where they did it and have it fixed, the repairs are guaranteed.
It's not difficult, I did it.
You have to remove the pipes that go to and return from the air filter.
Better also remove the battery.
To remove the fuel inlet tube you just have to press on the plastic clip, not pry it out like they do in some videos!
Make sure no dirt gets into the fuel tubes...
I continue to insist on the high pressure fuel pump.
A diagnostic device should be connected to the ODB2 port and see what the fuel pressure does when these missfiring occur.
If there were problems with the head gasket you would have an ugly foam under the oil filler cap.
If you have missfiring with cold starting, the problem is probably in the high pressure fuel pump.
If in the list of fault codes, apart from the missfirings, P0087 appears, then it is definitely the pump.
The turbo should not be insulated as it will work even hotter, shortening its life and increasing the risk of fire.
The original heat shield is to minimize burns if you put your hand in, it is not insulation.
You only need a ELM327 ODB2 bluetooth connector, available on Amazon, and a free app on your mobile device like Torque.
You will be able to read and clear the fault codes.
Total cost < €10
The safest thing is to recover the power that will surely have been lost over time, if it has gasoline engine by cleaning the intake valves.
If it has high mileage also checking the compression of the cylinders
I agree !
And if the timing chain rattles when cold, changing only the tensioner can probably improve it.
Many chain changes could have been avoided by changing just the tensioner, which is usually the main culprit.