High pinging at WOT...hmmm
Thread Starter
Drifting
Joined: Feb 2005
Posts: 1,770
Likes: 0
From: in ur mirror, 'bout to pass.. CA
High pinging at WOT...hmmm
So I'm on my way home from a softball tourney up north in Mio, MI, and as I near the house, I've got a few on-and-off ramps to play with. Once I'm in 2nd gear, I thought I'd "clear out the injectors" with a WOT run or two. Radio's off (I like the music from the BB's better); as RPM's reach the upper range, I hear a high pinging coming from the engine bay. It's metallic-sounding, like metal tapping metal. No power loss, no signs of anything amiss. The only time I hear it is on WOT runs, and only above 4500 RPM's. Could this be engine knock? Never heard it before, so I don't know what knock sounds like. I know what "deiseling" sounds like, but this ain't it. Only fuel I run is Sunoco 94 or BP 93.
Advice appreciated!
Advice appreciated!
Pro
Joined: Dec 2001
Posts: 530
Likes: 0
From: North Brunswick NJ
It sounds like it's time to decarb your engine with top end cleaner!
Your post sounds like mine from a year ago.
The hotter the air temp, the more my car would ping!
A matter of fact, 8,000 miles later and it's doing it again.
I think I need an oil catch can!
It can also be that you got a bad tank of gas.
I'm sure more people will answer with this same statement as well!
Your post sounds like mine from a year ago.
The hotter the air temp, the more my car would ping!
A matter of fact, 8,000 miles later and it's doing it again.
I think I need an oil catch can!
It can also be that you got a bad tank of gas.
I'm sure more people will answer with this same statement as well!
Instructor
Joined: Sep 2003
Posts: 185
Likes: 0
From: gaithersburg MD
Originally Posted by Armycop
So I'm on my way home from a softball tourney up north in Mio, MI, and as I near the house, I've got a few on-and-off ramps to play with. Once I'm in 2nd gear, I thought I'd "clear out the injectors" with a WOT run or two. Radio's off (I like the music from the BB's better); as RPM's reach the upper range, I hear a high pinging coming from the engine bay. It's metallic-sounding, like metal tapping metal. No power loss, no signs of anything amiss. The only time I hear it is on WOT runs, and only above 4500 RPM's. Could this be engine knock? Never heard it before, so I don't know what knock sounds like. I know what "deiseling" sounds like, but this ain't it. Only fuel I run is Sunoco 94 or BP 93.
Advice appreciated!
Advice appreciated!
I had a simlar problem with my 99 FRC. NEVER could get it resolved so I got rid of the car and got an 02. It was definitely a "HEAT" related problem. Do you have a 99? I've had others with 99 year C5s that have had the same issue. Could be related!?
Safety Car
Joined: Jul 2005
Posts: 4,275
Likes: 4
From: Vancouver WA
Originally Posted by HotLaperC5
I had a simlar problem with my 99 FRC. NEVER could get it resolved so I got rid of the car and got an 02. It was definitely a "HEAT" related problem. Do you have a 99? I've had others with 99 year C5s that have had the same issue. Could be related!?
From what I have read with the 99' and earlier LS1's pinging problem is due to the PCV. I think I would have to agree with the person above that said it's time to decarbon your motor. It seems heat related, but it's because the carbon on top of the piston doesn't start becoming a glow plug until the engine warms up.
Thread Starter
Drifting
Joined: Feb 2005
Posts: 1,770
Likes: 0
From: in ur mirror, 'bout to pass.. CA
Thanks for the replies, all. The vette's a 2001, just a tick over 23k miles on it. All I've run in it is 93 octane or better. Engine temp's during this trip never got above 200F, in fact she sits around 190F on the highway.
Drifting
Joined: Jul 2002
Posts: 1,484
Likes: 0
From: Morgan Hill Ca.
Bingo, Just solved my problem! I have been running tuner SW and doing a myrid of different runs. I don't have ping that you can hear and I don't have it that often. If I am running say 60 or 80 and punch it I get a couple of KRs nothing to write home about, but they do pull the timing back. From a standing start, nothing, they all seem to be rolling and when warm. Zounds Like a da katch kan is in my future! 
It does not do it all the time, just like they said above 4K, hot/warm, and I pulled the manifold a few weeks ago and I did have to clean the oil out of the TB, it was noticeable!
It does not do it all the time, just like they said above 4K, hot/warm, and I pulled the manifold a few weeks ago and I did have to clean the oil out of the TB, it was noticeable!
Le Mans Master
Joined: Aug 2000
Posts: 8,762
Likes: 2
From: Murphy TX
Originally Posted by Armycop
Thanks for the replies, all. The vette's a 2001, just a tick over 23k miles on it. All I've run in it is 93 octane or better. Engine temp's during this trip never got above 200F, in fact she sits around 190F on the highway.
Is it an early '01? Any oil consumption issues?
I had a similar problem on my '01 and attributed it to carbon buildup as a result of oil blowby (due to known ring issues with the early '01s)
I think a decarb would be a fast, easy thing to do.
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Burning Brakes
Joined: Jan 2004
Posts: 896
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From: Overland Park KS
Race Director
Joined: Jul 2005
Posts: 11,308
Likes: 1
From: The Beautiful Greater Bay Area California
This specific Tech Tip link for decarbing your engine has been available for over two years, and, is a very helpful link complete with pics. And, for DIY's, it really works. Good Luck. 
Melting Slicks
Joined: Jun 2004
Posts: 3,439
Likes: 6
From: Newark, DE
St. Jude Donor '06
Originally Posted by Dirty Howie
Is there any harm that can come from this proceedure.
Seriously... the pictures in that link don't do justice to the amount of smoke that will be generated.
Pro
Joined: Sep 2005
Posts: 693
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From: Gilbert AZ
Originally Posted by nwdanner
I have a bit of a rough idle and some pinging at WOT (which just recently started - bad gas maybe)?
So... my question is: is it possible for this procedure to damage the cat at all?
Pro
Joined: Jun 2005
Posts: 593
Likes: 1
Originally Posted by TomZ
I'm thinking about doing this procedure to an '01 that I just picked up.
I have a bit of a rough idle and some pinging at WOT (which just recently started - bad gas maybe)?
So... my question is: is it possible for this procedure to damage the cat at all?
I have a bit of a rough idle and some pinging at WOT (which just recently started - bad gas maybe)?
So... my question is: is it possible for this procedure to damage the cat at all?
Once cylinders and pistons tops are clean to keep it that way if you add water injection kit it not only gives you more performance but also will prevent carbon buildup
Drifting
Joined: Oct 2004
Posts: 1,621
Likes: 6
never had a problem with my 98 w 90k, but I did stay at a Holiday in last night. J/K
I install a catch cam mod for a whopping $30 in parts from Menards and was suprised to see the amount of oil that collects when you are on it only in the higher RPMs, lower RPM spirted driving and normal driving exibited no oil in catch can.
I install a catch cam mod for a whopping $30 in parts from Menards and was suprised to see the amount of oil that collects when you are on it only in the higher RPMs, lower RPM spirted driving and normal driving exibited no oil in catch can.
