Now that the weather is cooling off, something new has developed with my car. On cool mornings (< ~65*), before the car is fully warmed up, it will ping under heavy part throttle; always between 3400-3600 rpm. Just a quick clatter as it passes through that range. Running 93 octane from Shell.When fully hot, it clears up.
On the data log:
Coolant temp: 122
Spark Advance: 25
Commanded AFR: 14.8:1
Measured AFR: 15.3:1
It's running a little lean there, as my car tend to do. Most of the long term fuel trims are positive. But 15.3:1 is not excessively lean to knock at half throttle.
Thoughts?
On the data log:
Coolant temp: 122
Spark Advance: 25
Commanded AFR: 14.8:1
Measured AFR: 15.3:1
It's running a little lean there, as my car tend to do. Most of the long term fuel trims are positive. But 15.3:1 is not excessively lean to knock at half throttle.
Thoughts?