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Old 01-28-2013, 08:02 AM
pshovest pshovest is offline
Officially Welcomed to the 'Fest
Location: DE
 
Join Date: Dec 2009
Posts: 516
Mein Auto: '10 535iA, '00 528iTM
Ditto. I run 89 in (3) e39's year round without any difficulty or any audible knocking.
Perhaps noises are VANOS or exhaust rattle.



Quote:
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.
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