Backfires are caused by a number of different things,
The CAS is basically a signal generator.
It makes a signal from the rotating engine with a "blip" in the signal that corresponds to where Cyl#1 is at Top dead centre.
From this signal "blip" the cars computer can decide where to signal the spark plug ignition.
This is basic operation and is actually way more complex than this.
But without access to very expensive test 'scopes you only option is renew the CAS and see if it fixes the fault.
Posted on Wednesday 12th of July 2017Don't understand this? Ask a question