C5 Pinging
Thread Starter
3rd Gear
Joined: Jul 2004
Posts: 3
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C5 Pinging
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?
Race Director
Joined: Jul 2004
Posts: 16,794
Likes: 62
From: Lake Havasu City, AZ
If it wasn't for the little or no accelration I'd suggest you check your exhaustsystem for a loose hanger ..
Under heavy acceleration most C5's have a rattle that can be misdiagnosed for pinging that originates in the stock H pipe.
Under heavy acceleration most C5's have a rattle that can be misdiagnosed for pinging that originates in the stock H pipe.
Drifting
Joined: Jun 2002
Posts: 1,847
Likes: 1
From: Iowa
Cruise-In IV Veteran
Cruise-In V Veteran
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?
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Safety Car
Joined: Feb 2002
Posts: 3,725
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From: Montoursville Pa
Originally Posted by MagikDraggin
Whether or not it's bad gas, or whatever, I got tired of fooling around with mine and simply backed the timing off about 4 degrees and viola, no more "ping". Vette still runs like a scalded cat too.
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Advanced
Joined: Feb 2005
Posts: 90
Likes: 0
From: Boaz Alabama
I too am having a pinging or a jingling type sound in my 99 coupe (stock) I have just taken it to a muffler guy and he couldn't find any thing in the exhaust system.. it kinda sounds like it is coming from under the motor , I was under it also with the muffler guy,, we are both puzzled.. any suggestions.. will a blocked cat cause it to ping/jingling..?
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Pro
Joined: Oct 2005
Posts: 700
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From: SW Missouri
rws.1
Thanks for the info about the rattling of the stock H pipe. I got into it the other nite with a GSX-600R. He would not leave me alone so I finally gave him some back. I noticed when I was in 2nd or 3rd gear at about 4000-6000 RPM that I heard what I thought was pinging. I have never ran my C5 this hard that long. It was about a mile or so, only at the higher rev's. Is there anything I can do to the stock H pipe to cure this sound? I have a 99 coupe M6.
Safety Car
Joined: Feb 2002
Posts: 3,725
Likes: 366
From: Montoursville Pa
Originally Posted by Randy@DRM
10% mix is ok by fed standards at all gas stations 
.
One of our customers that owns a gas station told me that.
Randy
. One of our customers that owns a gas station told me that.
Randy
Drifting
Joined: Jun 2002
Posts: 1,847
Likes: 1
From: Iowa
Cruise-In IV Veteran
Cruise-In V Veteran
Originally Posted by ErnieN85
Curious minds want to know.........how do you back off the timing on a LS- engine?
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Safety Car
Joined: Oct 2004
Posts: 4,816
Likes: 132
From: Plano TX
Originally Posted by ErnieN85
Curious minds want to know.........how do you back off the timing on a LS- engine?
Instructor
Joined: Oct 2005
Posts: 130
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From: Honolulu Hi
I agree with the others,it probably not pinging,if it was pinging that bad,your PCM would switch over to the "low octane tables",this reduces the timing quit a bit,from 28* down to 18* - 21* iv'e seen on my scanner.
If your pinging in the low tables,theres something pretty wrong.
Your using at least 92 octane i'm assuming.
If your pinging in the low tables,theres something pretty wrong.
Your using at least 92 octane i'm assuming.
Safety Car
Joined: Feb 2002
Posts: 3,725
Likes: 366
From: Montoursville Pa
Originally Posted by David426
Loosen the distributor and turn clockwise about 1/4 of an inch. Use a timing light and make sure to chalk the timing pulley so it can clearly be seen.
Race Director
Joined: Aug 1999
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From: GARDENA Ca, State Of Konfusion
St. Jude Donor '05
Originally Posted by David426
Loosen the distributor and turn clockwise about 1/4 of an inch. Use a timing light and make sure to chalk the timing pulley so it can clearly be seen.
Team Owner
Joined: May 2001
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From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Originally Posted by David426
Loosen the distributor and turn clockwise about 1/4 of an inch. Use a timing light and make sure to chalk the timing pulley so it can clearly be seen.
