knocking on 89 gas
Guys, I've been running 89 in my car since I bought it. Rattles somewhat depending on throttle. I have done just about every tune up item possible. Plugs, CCV system, O2's, cooling system, fuel filter, DISA valve. What else in gods name can be causing it? I thought the car has a Knock sensor and 89 under "normal" conditions would be ok. If I run 93 it goes away. I know the answer I'm going to get... run 91+. but a stock car like this under a watchful eye and in great shape should run on 89 w/out rattle. Is my Knock sensor bad? No CEL.
DD: 2003 530i 5spd manual sport package. Conti DWS's, Llumar ATR, White LED lighting. TLC on-going.
Garage queen: '07 335i Sedan, base pkg, 6spd Manual, Procede 3 V5 w/NLS, staggered 18" 313's w/Conti DWS's, OS Giken TCD LSD, VAC Street Diff Cover, Akebono Euro Pads, CDV Removed, Black BMW Grilles, Interior & Exterior white LED lighting, LUX Angel Eyes, Debadged, Llumar ATR Tint.