C5 Pinging
Drifting
Joined: May 2003
Posts: 1,328
Likes: 3
From: Las Vegas Nevada
Originally Posted by Long EZ
I have a 2000 C5 coupe, automatic, with 50,000 miles. Recently, it started pinging under little or no acceleration. I have replaced the 4 O2 sensors, fuel filter & air cleaner, & used top end cleaner. The plugs seem to be in excellent condition. Fuel pressure is good and the injectors pass the 400ms/fuel pressure drop test. The computer shows no codes. Anybody have a sugestion as to what I should check next?
Local dealer wants to keep it for a week and $500 - 1500 to tear it apart to find it and fix it (!)
No way...I read multiple threads about the H pipe, and wonder if replacing it with the X pipe will solve it.
Racer
Joined: Sep 2005
Posts: 366
Likes: 0
From: IL
I have a 2000 A4 coupe that sometimes pings on light slow acceleration, such as when going up a hill. It is worse when the AC is on. I have tried switching to Shell V-power gasoline and using octane booster as well as injector cleaners. None of this made any difference. There is some info on this forum about a service bulliten on the knock sensors (which are supposed to tell the computer when your car is knocking and then automatically retard the timing). Some forum members say this is the last thing you should try, since just using some top engine cleaner and/or replacing the spark plugs often clears up the problem. Good luck. 
Race Director
Joined: Jul 2005
Posts: 11,308
Likes: 1
From: The Beautiful Greater Bay Area California
Top engine cleaner (Sea Foam, etc.) is helpful. Moreover, the number two knock sensor is known for having easily worn seals often due to water that has trapped in this area on top of the intake manifold. Check the TSB's. Good luck to you.
Instructor
Joined: Oct 2005
Posts: 130
Likes: 0
From: Honolulu Hi
It's really not that difficult to figure out,rent a scanner or have someone scan it for you,check to see if the timing is dropping.That eliminates all the other possibilites.Then go to the next possible problem if it's not the timing,such as shifter rattle,exhaust rattle.Theres the right way to do things,then theres guessing-confussing-and throwing money at the problem until you finally fix it.
Burning Brakes
Joined: Mar 2005
Posts: 1,227
Likes: 15
St. Jude Donor '06
not sure if this is it or not...if you already know this then just disregard it.
The C5 is known to have an extremely noisy throwout bearing. This might be your problem...I know mine is pretty loud especially if I turn the car off with my foot off the clutch pedal.
The C5 is known to have an extremely noisy throwout bearing. This might be your problem...I know mine is pretty loud especially if I turn the car off with my foot off the clutch pedal.
