If the intake manifold is leaking, the engine starts to run unevenly (troit)
If tightening the intake manifold mount fails to eliminate the leakage, then the gasket must be replaced
To replace the intake manifold gasket, you need tools: Torx T25 wrench, socket 10 and screwdrivers
Preparing the car for the task
Reducing the fuel pressure as described in the article " How to check compression in Mazda 6 engine cylinders"
Disconnect the negative battery terminal
Disconnecting the air inlet
We move the latch and disconnect the wire block from the cover of the throttle assembly
Disconnect the fuel line from the fuel rail
Disconnect the adsorber purge hose from the intake manifold fitting
Unscrew the screw securing the oil level indicator bracket
Unscrew the intake manifold mounting bolts
The location of the intake manifold mounting bolts is shown in the picture
Carefully move the collector to the side
Squeeze the bent antennae of the hose clamp and slide the clamp along the hose
Disconnect the hose from the oil separator valve
Remove the intake manifold assembly with the throttle assembly
Remove old gaskets
Install new gaskets and intake manifold
We tighten the fastening bolts evenly crosswise with a torque of 15 Nm (1.5 kgf.m), starting from the outer bolts and moving on to the middle ones
Install all removed parts in reverse order
When installing the fuel rail, install new fuel injector O-rings
Removing the drives of the intake manifold geometry change system
Remove the intake manifold as described above
We unscrew the three screws securing the pneumatic actuator of the intake manifold geometry change system
Removing the pneumatic actuator
This is how the pneumatic actuator of the intake manifold geometry change system looks like
We unscrew the two fastening screws and remove the second pneumatic actuator
Install the pneumatic actuators in reverse order
Exhaust manifold gasket replacement
The exhaust manifold gasket is a molded metal strip
If the gasket is broken, there is a breakthrough of exhaust gases (collector cuts)
If tightening the collector fails to fix the problem, then we replace the gasket
We unscrew the seven nuts securing the exhaust manifold to the cylinder head
Move the exhaust manifold and take out the old gasket
Installing a new gasket and exhaust manifold
We tighten the fastening nuts in the order shown in the figure and tighten with a torque of 43-64 Nm