4.6 spark knock
Thread Starter
|
New User
Joined: Jun 2015
Posts: 6
Likes: 0
4.6 spark knock
My 2010 F150 with the 3v 4.6 V8 has a slight spark knock during light to moderate load. It goes away with a downshift to higher rpm and is only slightly audible when accelerating or climbing a hill. When I put 93 octane in the tank as a test it completely went away. I usually run top tier 87 octane. All maintenance is up to date. I did plug in my code scanner and the timing does retard during the times of knock to 20 degrees btdc, so I am pretty sure the knock sensor is working. No CEL or codes being thrown. The truck otherwise runs great with excellent gas mileage. My question is this: the owners manual says that light knocking is okay, but has anyone else had this problem? How much damage could I have done or could this do to my engine? I have 56000 miles on her and bought this truck with 46000 miles a few months ago. Thanks for the help in advance!
Thread
Thread Starter
Forum
Replies
Last Post
