Why is my engine making this knocking sound
Asked by Levilangley03 Nov 16, 2020 at 12:38 AM about the 2009 Dodge Charger SRT8 RWD
Question type: Maintenance & Repair
My 2009 Dodge Charger srt8 seems to be pinging
or knocking when at freeway speeds but not idling.
Any ideas what this is?
4 Answers
What octane fuel are you using. That car requires premium.
Levilangley03 answered 4 years ago
I’m using 91 which is the best my city has to offer. It’s strange to me because it’s only on the freeway. And it’s subtle and kinda fades in and out
Ask your Governor Why you aren't allowed to purchase 93 octane any longer..!
olgeezer, it has nothing to do with the governor. Octane ratings change with elevation. The higher above mean sea level you go the less dense the air and the lower the octane requirement is. Cities along the coasts have 93 available, here in Kansas we have 91 octane. As for the SRT8, I might try a spark plug change and check to see that the air filter is not dirty.