Weird 360 Modena backfire...

There seems to be a lot of THIS particular thing going on with my car also. I would replace ALL of the coils, as there is no way to test them. Before that I would do a ECU reset. I have done it about 10 times and each time a different result!!! Now if I do not hit the gas hard it runs great. I am going to just take it easy, put some miles on it and see what happens. I believe that these ECU's have to LEARN some inputs after the reset. Here is the best ECU reset that I have found.
Next, start the engine and let it idle for at least 5 mins (Ferrari recommend 4 mins, I prefer to let it idle for about 10). To begin with the engine will sound terrible, as if it’s misfiring. This is because all the trim values have been erased from the ECUs. By allowing the engine to idle the ECU can re-learn the correct trim to be applying to the parameters. The engine note will improve quickly.
Idle for at least 5 mins from cold. As well as re-learning the adaptive parameters, the ECU also checks that the lambda sensor heater elements are working correctly and tests that the purge valves on theFuel Vapour Emission Control System (aka EVAP) are operating properly.
Drive the car in 3rd or 4th gear with an engine speed of between 2,000 and 2,500 rpm for 3 1/2 miles (no hard accelerating or erratic shifting). The ECU checks ignition, fuel trim, cat efficiency, lambda sensors, PCV valve operation and EVAP purges.
Shift to 4th gear and increase engine speed to 4,500 rpm and hold for 30 seconds. This ensure the engine is operating in a steady state.
Decrease engine speed to 2,000 rpm without changing gear or braking. ECU checks PCV valve operation and EVAP purges.
Gently stop the car without changing gear, shifting into neutral when required. Let the engine idle for 5 minutes without touching the throttle or changing the engine load (for example by turning on/off any electrical equipment or air conditioning). This allows the ECU to learn the engine idle control properly.
Switch the engine off and remove the key. Keep the engine off for at least 30 seconds.
Restart the engine and drive the car normally for 10 minutes (no hard accelerating or erratic shifting). The ECU re-checks ignition, fuel trim, cat efficiency, lambda sensors, PCV valve operation and EVAP purges.

 

Hey md355 dif you get to the bottom of the backfire?

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I think u need to use diagnostic tool to see parameters, like fuel trims and timing stuff.

 

Hi guys. I have some more news on my backfire. It appears that the fuel cannister and associated valves were bad. I have replaced these and it this stage it appears to have gone with a really beautiful 'on song' exhaust note. True a capristo race exhaust is helping but i dont remember it ever sounding like this and i have owned it for almost 10 years and fitted the capristo immediately back then. The computer threw all 3 codes. Be worth having a look.

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The fuel tank vapor valves are predominantly NLA. Change to the new green base gasket
for the valves and apply some sealant. This may solve your problems . New gasket number is 195049.