Bimmerfest - BMW Forums - View Single Post - knocking on 89 gas
View Single Post
Old 01-28-2013, 08:02 AM
pshovest pshovest is offline
BMW CCA 69606
Location: DE
Join Date: Dec 2009
Posts: 1,381
Mein Auto: '10 535i '08 X5 '00 528i
Ditto. I run 89 in (3) e39's year round without any difficulty or any audible knocking.
Perhaps noises are VANOS or exhaust rattle.

Originally Posted by DHoang View Post
Something's wrong w/ your car if you can't run 87 oct. w/o it knocking.
My car runs perfectly fine on regular gas 87 oct.

i think you're right w/ suspecting that your knock sensor is not working right.
It's supposed to detect knock and send a signal to the computer so the computer can retard the ignition to prevent knocking.
Reply With Quote