DETONATION sensor goes bad sends the ECU into open loop spark is retarded mixture is enriched and overdrive is lost
Plus a check engine light comes on. Back in the sixties when a Sunbeam Tiger owned me, I use to commute to Lake Tahoe on the weekends. Engine had 12.5 -1 venolia pistons
Above 4000 ft altitude I ran it on regular gas and set the timing at 12BTDC
The dealer does have far better diagnostics but a professional reading of the plugs in this case will reveal more than any computer chip would ever see. The object is to see if a single cylinder is causing the ping.
