Re: Engine knock 2009 Escape 4cyl
John - as the vehicle is under warranty, make a bit of a stink about it at your dealer. Don't wait until your next service visit or that'll make them think that you're not too concerned about it. Take the trip now, because if it is pre detonation you can cause damage to the engine.
Shell fuel is also the best out there, and I highly doubt that is your problem.
Perhaps a spark plug might be fouled enough to cause the noise but not enough to trigger an engine code. The dealer can also scan for codes, but make sure they do it at no charge!
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!