Valve Ping with Edelbrock E Force
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
Look at the picture. My car had less mileage than your when that happened. Had terrible pinging from mid to full throttle when they blocked. Im just thinking maybe in early stages the pinging might be at different RPM. I dont know if thats the problem but I would check it just to get it out off the list of possibilities. And by check I mean remove the cats and check. Its the only real way to be sure.
Thread Starter
Racer
Joined: Mar 2008
Posts: 327
Likes: 22
From: Ligonier PA
Look at the picture. My car had less mileage than your when that happened. Had terrible pinging from mid to full throttle when they blocked. Im just thinking maybe in early stages the pinging might be at different RPM. I dont know if thats the problem but I would check it just to get it out off the list of possibilities. And by check I mean remove the cats and check. Its the only real way to be sure.
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
This happened a while after adding the eforce. It seems to be a fairly common problem on boosted cars. Like I said, since you havent even run the car with the SC much I dont know the odds of it being a problem. Im just saying its an easy thing to check, so why not get it out of the way. I dont know how your car was tuned but if a bunch of dyno pulls were done with the car rich ,or with missfires, the fuel dumped into the cats can ruin them.
Safety Car
Joined: Sep 2007
Posts: 3,502
Likes: 82
I guess the correct term is "detonation", or spark knock / pre-ignition. Yes the car is 100% stock other than the supercharger. Headers are next on the list but I am glad I treaded lightly (one change at a time) so I don't have to worry about what caused the issue.
I had a new tune put in her Saturday morning (the third tune so far) and still have the issue. 3,200 to up around 3,800 to 4,000 rpm, light accelleration, detonation is heard. My speed shop is working with Chris at Edelbrock. The shop called Monday morning and have another tune for me but my schedule is prohibiting getting out to them until later in the week.
Motorhead, you have alot of experience with this set-up, what the heck is going on? Any clue?
I had a new tune put in her Saturday morning (the third tune so far) and still have the issue. 3,200 to up around 3,800 to 4,000 rpm, light accelleration, detonation is heard. My speed shop is working with Chris at Edelbrock. The shop called Monday morning and have another tune for me but my schedule is prohibiting getting out to them until later in the week.
Motorhead, you have alot of experience with this set-up, what the heck is going on? Any clue?
I'd recheck the install. One possibility...Here is a photo of an install poorly executed that resulted in a crushed coil pack wiring harness resulting in misfires. I'm aware of this happening in two seperate installs at two different shops. In both cases they were professional installs executed at well known forum vendors.
Thread Starter
Racer
Joined: Mar 2008
Posts: 327
Likes: 22
From: Ligonier PA
This happened a while after adding the eforce. It seems to be a fairly common problem on boosted cars. Like I said, since you havent even run the car with the SC much I dont know the odds of it being a problem. Im just saying its an easy thing to check, so why not get it out of the way. I dont know how your car was tuned but if a bunch of dyno pulls were done with the car rich ,or with missfires, the fuel dumped into the cats can ruin them.
I'll keep you posted.
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
[QUOTE=Motorhead-47;1580879349]I would look beyond the tune. Audible ping with the handheld tuner calibration is not typical.
I'd recheck the install. One possibility...Here is a photo of an install poorly executed that resulted in a crushed coil pack wiring harness resulting in misfires. I'm aware of this happening in two seperate installs at two different shops. In both cases they were professional installs executed at well known forum vendors.
Good point Motorhead. That happened to me and I think thats what damaged my cats. Running the car while troubleshooting that problem. It took ages to find and a lot of missing going on.
I am not sure what year it changed but the new harnesses I got had plastic runners protecting the wires. The 2007 LS2 stock ones did not.
I'd recheck the install. One possibility...Here is a photo of an install poorly executed that resulted in a crushed coil pack wiring harness resulting in misfires. I'm aware of this happening in two seperate installs at two different shops. In both cases they were professional installs executed at well known forum vendors.
Good point Motorhead. That happened to me and I think thats what damaged my cats. Running the car while troubleshooting that problem. It took ages to find and a lot of missing going on.
I am not sure what year it changed but the new harnesses I got had plastic runners protecting the wires. The 2007 LS2 stock ones did not.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Safety Car
Joined: Sep 2007
Posts: 3,502
Likes: 82
[QUOTE=realcanuk;1580879377]
Ok so now I know of three instances of this happening! You have to strip off the plastic covers for the install. They won't fit.
I would look beyond the tune. Audible ping with the handheld tuner calibration is not typical.
I'd recheck the install. One possibility...Here is a photo of an install poorly executed that resulted in a crushed coil pack wiring harness resulting in misfires. I'm aware of this happening in two seperate installs at two different shops. In both cases they were professional installs executed at well known forum vendors.
Good point Motorhead. That happened to me and I think thats what damaged my cats. Running the car while troubleshooting that problem. It took ages to find and a lot of missing going on.
I am not sure what year it changed but the new harnesses I got had plastic runners protecting the wires. The 2007 LS2 stock ones did not.
I'd recheck the install. One possibility...Here is a photo of an install poorly executed that resulted in a crushed coil pack wiring harness resulting in misfires. I'm aware of this happening in two seperate installs at two different shops. In both cases they were professional installs executed at well known forum vendors.
Good point Motorhead. That happened to me and I think thats what damaged my cats. Running the car while troubleshooting that problem. It took ages to find and a lot of missing going on.
I am not sure what year it changed but the new harnesses I got had plastic runners protecting the wires. The 2007 LS2 stock ones did not.
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
Safety Car
Joined: Sep 2007
Posts: 3,502
Likes: 82
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
Le Mans Master
Joined: May 2011
Posts: 5,022
Likes: 18
From: Tampa FL (formerly Justinjor)
Tech Contributor
St. Jude Donor '11-'12-'13-'14
When you compress air, it heats up. When you heat up air, it makes the cylinder run hotter. When the cylinders run hotter, they spit out hotter than normal EGTs(exhaust gas temperatures). When you spit out hotter than normal EGTs, the cats overheat and the precious metals cook and break. When the precious metal cooks and breaks, it looks like the picture.
Don't look like the picture.
Install catless headers/x pipe and enjoy your car
Don't look like the picture.
Install catless headers/x pipe and enjoy your car
Safety Car
Joined: Dec 2009
Posts: 4,754
Likes: 303
When you compress air, it heats up. When you heat up air, it makes the cylinder run hotter. When the cylinders run hotter, they spit out hotter than normal EGTs(exhaust gas temperatures). When you spit out hotter than normal EGTs, the cats overheat and the precious metals cook and break. When the precious metal cooks and breaks, it looks like the picture.
Don't look like the picture.
Install catless headers/x pipe and enjoy your car
Don't look like the picture.
Install catless headers/x pipe and enjoy your car
Glad someone got my humor
Thread Starter
Racer
Joined: Mar 2008
Posts: 327
Likes: 22
From: Ligonier PA
Even I, in the midst of screwing up my $60,000 investment, must laugh at that one buddy.
Seriously though, will catless work in PA where they check emissions annually?
Hate to have to install cats for emissions test and remove them every year.
Seriously though, will catless work in PA where they check emissions annually?
Hate to have to install cats for emissions test and remove them every year.
Last edited by Jetstream Blue Bill; May 22, 2012 at 04:27 PM. Reason: SPELLING
Moderator emeritus
Joined: Jun 2001
Posts: 18,599
Likes: 3,955
From: Jacksonville Florida BWO Dayton, Cincinnati, Bloomsbury NJ, Cincinnati
2015 C7 of the Year Finalist
Elmer
Le Mans Master
Joined: May 2011
Posts: 5,022
Likes: 18
From: Tampa FL (formerly Justinjor)
Tech Contributor
St. Jude Donor '11-'12-'13-'14
I don't think high flow cats will pass emission anyway so you'll likely need to make buddies with an emissions guy to get it done on the hush hush.
If in fact your cats are clogged and you need to retain them, I'd be in contact with edlebrock as they might have an answer for you.
If in fact your cats are clogged and you need to retain them, I'd be in contact with edlebrock as they might have an answer for you.
Le Mans Master
Joined: May 2011
Posts: 5,022
Likes: 18
From: Tampa FL (formerly Justinjor)
Tech Contributor
St. Jude Donor '11-'12-'13-'14