No vacuum leaks. I replaced all the vacuum hoses and MAF boots. I also spray carb cleaner around items with the engine idling (cold!) to verify. I need to look at the wiring going to the knock sensor. It's not VANOS noise... or exhaust. it's spark knock. I'm 100% sure. I know what it sounds like. I've been driving modified cars for 13yrs. Sounds the same in a V8 as it does in a TT Supra, as it dones in a junky Malibu. It's spark knock. But this new of a car (yes 2003 new) should adjust for 89 gas. Brands do not matter. I drive about 30-40k year. I get to try brands all over the Southeast. How many knock sensors does the M54 engine have? 1 or 2? Approx where is it?
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.
Last edited by FLE39; 01-28-2013 at 08:25 AM.