My explorer has been knocking pretty bad for a while now. I was pretty sure that these 4.0s didn't need high octane gas, but what is the compression ratio on these engines. I started running 89 octane and it is still there.
Is this a common problem with these engines? Is there a fix? Any suggestions are appreciated.
Thanks
Is this a common problem with these engines? Is there a fix? Any suggestions are appreciated.
Thanks