Knock knock...
Thread Starter
Staging Lane
Joined: May 2003
Posts: 73
Likes: 0
From: Fremont, CA
Knock knock... Hi everyone. Since I got my predator a few weeks ago, I've noticed that I'm getting A LOT of knock retard while cruising around. Anywhere from less than one degree to 9 or more! It only occurs when I'm already moving and then give her some gas (not mashing it, even a little gas will do it.) It does NOT happen when I go from a stop or when I'm WOT. So far I've done the following to try to remedy it:
None of that helped at all. When at higher speeds like above 50, when I give her gas from a cruise, sometimes I also hear a metallic sound that almost sounds like a scraping (probably pinging?) which is sometimes followed by KR to varying degrees. I can only get 91 octane here in Cali but I've been using 76 or Chevron gas the past month and it hasn't helped. Also, I do not have the Predator tune installed. I tried installing it but it didn't help so I went back to stock.
I'm stumped
Any help or suggestion anyone could offer would be much appreciated! Thanks in advance! 
- Change the plugs to NGK TR55-IX's (stock plugs 7 and 8 had some gunk on the tips...)
- Run liquid Sea Foam through the brake booster line (no smoke really came out)
- Change the oil
- Change the PCV valve (had some oil on it)
- Run Red Line injector cleaner
None of that helped at all. When at higher speeds like above 50, when I give her gas from a cruise, sometimes I also hear a metallic sound that almost sounds like a scraping (probably pinging?) which is sometimes followed by KR to varying degrees. I can only get 91 octane here in Cali but I've been using 76 or Chevron gas the past month and it hasn't helped. Also, I do not have the Predator tune installed. I tried installing it but it didn't help so I went back to stock.
I'm stumped
Any help or suggestion anyone could offer would be much appreciated! Thanks in advance! 
