kplaya186

iTrader: (1)

My car has been knocking when I have been driving over the Sierra's. I am going from 1000ft to 9000ft then back to 5000ft. within a few hours. Is my car just trying to keep up with the elevation change causing the knock?

jarhead

No neither my car nor my wifes 2010 knock even going higher altitude than that and back down. Are you audbly hearing it or seeing it on a monitor? They do sell crappy 85 octane at higher elevations did you happen to put some of that in you're car? Even at high elevation keep at least 91 octane in you're SS/TC. N/A cars can get away w/o knock on 85 at high elevations but I do not run it even in our N/A car.

kplaya186

iTrader: (1)

Audibly. I am using only 91 octane.

kplaya186

iTrader: (1)

Sounds like this

http://www.youtube.com/watch?v=8cVDb...e_gdata_player

jarhead

I thought you meant knocking or pinging as you were driving under load at different elevations not sitting and idling. I can't really tell from the vid the high pressure fuel pump makes some noise ticking in the vid can't really tell if it is something worse lifter related or anything. You're car is doing the noise all the time? That it has not been previously and only after you drive through the mountains? Not when you are back at lower elevations kinda confused now. how long have you had this car and it is all stock?

rukkee

iTrader: (3)

I'm guessing it's a cam follower thats broke . Could be a timing chain issued but the car's Ive heard with bad timing chain tensioners.... didn't sound like that .

kplaya186

iTrader: (1)

This occurs randomly at lower elevations, but does occur everytime I drive through the mountains.

kplaya186

iTrader: (1)

I am not stock. Trifecta, KN, catless dp, and forge BPV. This video occurs with tune off since I rarely have it on.