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<x-flowed windows-1255>could he have a few head studs pulling loose?
Aaron Clow wrote:
Daniel Baum wrote:
Sounds like detonation to me. Very serious. Back off the throttle til it
stops when you hear it.
I always either back off the throttle or downshift when this happens.
To Check if this is indeed your problem, buy premium the next time you fill
up. If the problem goes away, it is indeed detonation.
I had wondered whether I needed a higher-octane petrol but I would be quite surprised if this is the case. I use 96 octane. Since they stopped selling leaded petrol over here a couple of years ago, the 96 octane has had a potassium additive added to it (I think this is what they call LRP in England). Other options are 95, 98 and 99-octane unleaded. Surely it shouldn't require 99 octane?
Yipes! Here in NY I think the highest we can get is 94 (Sunoco Premium). 93 as premium is much more common. If you're getting pinging at 96 octane, either your engine compression ratio is completely messed up, or this is NOT the issue.
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