Join Date: Sep 2007
I'm pretty sure Alfa would do more diagnosis than "misfire" before authorizing an engine replacement. For starters the ECU download would inform the factory of a great deal. Then, if there is any mechanical symptom they usually sample the engine oil, taking apart the oil filter if deemed advisable.
Modern engines just do not misfire unless there is a very serious failure. The ECU will be able to diagnose any electrical fault such as a failed spark plug. The main issue would be the cost of repair if done outside a factory environment. At the factory the engine can be salvaged and rebuilt as new after the cause of the failure is known. Power outputs on these engines are higher than on racing engines of a few decades ago. Lots can go wrong during manufacture of the various component parts and defects are rare but usually catastrophic.
Finally, a new factory unit makes perfect sense as it ensures the warranty and emission performance will be as new.
1991 Alfa Romeo 164L 5 spd
White on grey leather 230K km, owned from new
Last edited by Michael Smith; 11-17-2017 at 06:14 AM.