doubtful your knocking. code reader should show knock sensor triggers, although i cant think if i've seen that option on my 9g.Many thanks for the replies.
Gauge is about the same position as the photo above.
What I have noticed is during hot weather (>20 degrees) and only once the car is warmed up, I think it's detonating/pinking occasionally and does seem more sluggish than when it's cold. I had read this can happen if the engine is running too hot, which I was wondering about because I can't remember the last time the engine fan ever came on. But sounds like the temperature is ok.
I imagine this retard value would be the ignition timing:- Higher retard, lower knock, meaning less octane required.Sorry for the delay and thanks for the replies.
Actually I plugged in the OBD2 scanner to hopefully find a way of logging the knocking to prove it happens more when it's hotter. The only value I could find which sounded similar was called something like "cylinder #1 retard" which goes up and down as you drive about, I guess this is the timing being adjusted?
It doesn't do it when the engine is cold, but will when it's hot and on a hot day and under load, e.g. driving up hills, aircon on, pulling away from stationary (1st/2nd etc). I have noticed it does do this less using premium RON97/99 fuels and is worse with regular (95), so mostly use 99 during the summer which is obviously more costly. Mentioned it at the last service but got the usual "couldn't find anything wrong", but is very intermittent and wasn't a cold day. I did wonder if it's worth changing the spark plugs, they are looking a bit sooty but look ok I think (will post some photos later). It's done 50k miles, Honda said they are good for about 75k miles so convinced me it isn't that, so I started to wonder if it's something like a PCV value, which I previously removed and cleaned, but it doesn't look gummed up or anything.