Rattling at Full Throttle
05-21-2009, 03:14 AM
#11
3rd Gear Member
Join Date: Oct 2008
Location: Toronto, Ontario, Canada
Posts: 743
You mean Pistons don't you.!! 
05-21-2009, 07:53 AM
#13
6th Gear Member
Join Date: Sep 2006
Location: Gainesville, FL
Posts: 11,278
how about revving getting pinging in like the 5000+ range? will this destroy my motor?
i'm on a brenspeed 93 tune and have 93 octane in the car...........should i just go down to the 91 octane tune (i have a non-adjustable xcal1) and still run 93 octane?............pinging, IIRC, is an indication of preignition.......would a lower octane tune (less aggressive timing) solve this? i think i'm just getting bad gas
don't our cars have FOUR knock sensors (on the 4.6)? my car runs strong as ****..........all RPM ranges, it pulls like a son of a bitch.
i'm on a brenspeed 93 tune and have 93 octane in the car...........should i just go down to the 91 octane tune (i have a non-adjustable xcal1) and still run 93 octane?............pinging, IIRC, is an indication of preignition.......would a lower octane tune (less aggressive timing) solve this? i think i'm just getting bad gas
don't our cars have FOUR knock sensors (on the 4.6)? my car runs strong as ****..........all RPM ranges, it pulls like a son of a bitch.
05-21-2009, 07:58 AM
#14
6th Gear Member
Join Date: Sep 2006
Location: Gainesville, FL
Posts: 11,278
It's pinging and you can choose to ignore it and hope it doesn't burn a hole in your piston or you can have brenspeed adjust your tune. I'd personally load a 91 tune if you have one and stick with 93 gas.
05-21-2009, 10:46 AM
#15
2nd Gear Member
Join Date: Aug 2008
Location: College Park MD
Posts: 377
I don't have a 91 octane tune but I have 87 and 89. I'll switch and see if that fixes it.
05-21-2009, 02:14 PM
#17
3rd Gear Member
Join Date: Jan 2007
Location: Virginia
Posts: 721
Could be. Mine def. does hit at times . I have a off road X pipe. But with the stock pipe no problem. I also had/have a rattle /buzzz noise coming from the front trans. area. Got it after I had my ATI torque convertor installed. Sounds like a that could be the trans. shield plate.
05-21-2009, 07:39 PM
#19
2nd Gear Member
Join Date: Aug 2008
Location: College Park MD
Posts: 377
Thank you to everyone who contributed to this thread. My rattle was a slight ping under load in the lower gears. I thought it sounded like an exhaust rattle right at the h pipe. I wanted to test it out so I loaded my 89 octane tune and filled with 93. From what brenspeed told me that would rule out a rattle. Ping is gone. I'll get the 91 tune as soon as I can. I can't help but be a little aggrivated that I've been pounding on the car since got it with the tune not quite right. No check engine light, no codes; nothing. O, well 8000 miles under my belt, now I know the engine is much more sensative than I thought.
