it would also be your timing...but try better gas and a good gas additive first...
rattle sound under hard acceleration
Thread Starter
Racer
Joined: Apr 2009
Posts: 403
Likes: 9
From: Surprise AZ
rattle sound under hard acceleration
under normal driving i never hear this but when i accelerate really hard and get to about 3500K I hear this rattle sound coming from up front, sounds like its below the engine. Sounds Kind of like rocks in a Coffee can rattling around. Could this be the gas I'm using? I just got the car a month ago and put mid-grade in it. should i be using Premium? its a 2001 vert, 96K miles, the only mod is a K&N CAI but i heard this sound before the CAI.
Thanks for the help
Thanks for the help
Pro
Joined: Oct 2005
Posts: 738
Likes: 2
From: Richmond VA
under normal driving i never hear this but when i accelerate really hard and get to about 3500K I hear this rattle sound coming from up front, sounds like its below the engine. Sounds Kind of like rocks in a Coffee can rattling around. Could this be the gas I'm using? I just got the car a month ago and put mid-grade in it. should i be using Premium? its a 2001 vert, 96K miles, the only mod is a K&N CAI but i heard this sound before the CAI.
Thanks for the help
Thanks for the help
Safety Car
Joined: Dec 2004
Posts: 4,876
Likes: 1
From: Jersey Shore Exit 98
Instructor
Joined: Mar 2008
Posts: 218
Likes: 1
I had the same pinging issue for a while with my 2001 vert as well. Did the top end cleaner and new gas but it did not help. Chuck Cow finally came to the rescue and suggested I clean my MAF. Did that and a fresh tank of 93 octane and the pinging has stopped.
Thread Starter
Racer
Joined: Apr 2009
Posts: 403
Likes: 9
From: Surprise AZ
Ill try the gas and the cleaner first. I've still got about 3/4 tank of the 89 octane in it right now. Is it ok for me to put some Octane boost in the tank to get me started, or just wait until my tank is empty.
Racer
Joined: Aug 2007
Posts: 480
Likes: 0
From: Navarre, Florida
Best of luck.
Chris
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Le Mans Master
Joined: Sep 2003
Posts: 6,276
Likes: 227
From: Farmington CT
Cruise-In VII Veteran
your low grade is fine for part throttle operation until you can refill
a lot of C5's do this, although making a diff. sound from out back caused by the stock Hpipe, GM has a TSB on this
pinging and the 'rattle' from hpipe are 2 very diff sounds
a lot of C5's do this, although making a diff. sound from out back caused by the stock Hpipe, GM has a TSB on this
pinging and the 'rattle' from hpipe are 2 very diff sounds
Pro
Joined: Jan 2004
Posts: 749
Likes: 0
From: Las Cruces New Mexico
Okay, at 3.5 million RPM's I think everything would rattle.
Seriously though, everyone jumped on engine knock and that may well be the problem even though I think the anti-knock sensor would quiet that by pulling timing out, you may have a loose exhaust header, metal shielding or something else going on under there. Good Luck!
Seriously though, everyone jumped on engine knock and that may well be the problem even though I think the anti-knock sensor would quiet that by pulling timing out, you may have a loose exhaust header, metal shielding or something else going on under there. Good Luck!
Pro
Joined: Sep 2003
Posts: 722
Likes: 8
From: N.Canton Ohio
