C5 Pings Under Acceleration
Thread Starter
Le Mans Master
Joined: Feb 1999
Posts: 8,351
Likes: 75
From: Tampa Bay FL
C5 Pings Under Acceleration
Anytime I get my foot into the accelerator on my C5, I get spark knock/detonation. Is this normal or is it time for a service call?
I run 93 octane and normally from Exxon, Mobil, Chevron, 76 or Amoco.
I run 93 octane and normally from Exxon, Mobil, Chevron, 76 or Amoco.
Le Mans Master
Joined: Apr 1999
Posts: 7,820
Likes: 0
From: Burlington ON
Cruise-In I, II, III, IV & V Veteran
CI-I & II Auto-X Champ
Re: C5 Pings Under Acceleration (TedH)
Sounds like something is definitely wrong, especially if you have never changed any of the timing tables and you are running at least 91 octane fuel.
It almost sounds to me like you may be having a fuel pump problem and your fuel pressure is way too low..
It almost sounds to me like you may be having a fuel pump problem and your fuel pressure is way too low..
Pro
Joined: May 2001
Posts: 553
Likes: 5
Re: C5 Pings Under Acceleration (TedH)
Detonation means you're running lean; typically it's from bad gas (watered down, lower octane than advertised, etc) so if the problem just started, try and wait until you're down to about 1/8-1/16 tank before refilling (at a different station) and hopefully it'll take care of itself.
Team Owner
Joined: May 2000
Posts: 25,346
Likes: 222
From: Frisco, TX
Re: C5 Pings Under Acceleration (TedH)
I developed pinging in my '01 coupe fairly early on -- I think it was in the 5-10k mile range. I changed my PCV system, and the problem immediately went away. The change I went with can be found here: http://www.fbody.com/members/stevenm...ML/pcv_mod.htm. Basically, it sets up a more restrictive flow in the PCV system and adds in-line filters. The theory is that the stock PCV system in some LS1s is permitting too much oil vapor, and possibly liquid, to get back into your intake. Anyhow, if you read the site, you'll see the author did comparos of before and after and also returned back to before to see how it affected pinging, and he found considerable improvement with the mod. I had the same success.
More recently, I took my car in for oil consumption. The Chevy service test first replaced my PCV valve (I had returned my system to stock prior to bringing the car in). With the new valve, I did not notice any pinging for about 600-700 miles, but after that the pinging has returned. :mad
Good luck. :seeya
[Modified by SteveL2, 9:44 AM 8/9/2002]
More recently, I took my car in for oil consumption. The Chevy service test first replaced my PCV valve (I had returned my system to stock prior to bringing the car in). With the new valve, I did not notice any pinging for about 600-700 miles, but after that the pinging has returned. :mad
Good luck. :seeya
[Modified by SteveL2, 9:44 AM 8/9/2002]
