Audible ping but nothing on scanner
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Audible ping but nothing on scanner I can hear an audible ping like cheap gas under wot, but I see nothing on HP Tuners. My old oil burning 408 never had an issue with pinging. Everything in my setup is the same except for the pistons and block. The CR is the same, same heads, cam and headers. I did change from a catted true dual to a Kook's catted Y-pipe. I origionally had a Corsa catback on but that was way too loud. But when I did have it, I didn't notice any pinging. I swapped to a Magnaflow catback and began hearing it. I added Lucas Octane booster and made no difference. I scanned and noticed it was leaner so I added fuel, helped but not gone. I took away timing from 28* to 24* and changed to TR6 plugs. Once again it helped but still there. I made sure the knock sensors are using factory settings and still nothing. I don't get it, never had an issue before... Should I be looking somewhere else for the cause???
I can hear an audible ping like cheap gas under wot, but I see nothing on HP Tuners. My old oil burning 408 never had an issue with pinging. Everything in my setup is the same except for the pistons and block. The CR is the same, same heads, cam and headers. I did change from a catted true dual to a Kook's catted Y-pipe. I origionally had a Corsa catback on but that was way too loud. But when I did have it, I didn't notice any pinging. I swapped to a Magnaflow catback and began hearing it. I added Lucas Octane booster and made no difference. I scanned and noticed it was leaner so I added fuel, helped but not gone. I took away timing from 28* to 24* and changed to TR6 plugs. Once again it helped but still there. I made sure the knock sensors are using factory settings and still nothing. I don't get it, never had an issue before... Should I be looking somewhere else for the cause???
Could be a loose heatshield vibrating or hitting the exhaust at wideopen throttle when the engine twists. Mine would do it and it wasn't knock but it sounded alot like it and freaked me out everytime.
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Like CobraKiller said, I would make sure none of your exhaust system is banging around and duplicating the infamous pinging sound. Having said that, I have had legitimate pinging issues depending on gas quality etc, and not shown knock. If I upped the timing 2 degrees in that area, I recorded knock.
My point is once you can determine if it is legitimate engine pinging, my approach is to just continue to gradually lower the timing until you no longer hear it. Granted some will argue peak combustion power is always found just short of the the 'pinging threshold', but I did not find that true in my case.
Two easier ways to determine if it is legitimate pinging. Does higher octane fuel eliminate the sound, or does either significantly lowering or raising the timing exasperate the sound. I think the quality of gas varies and contributes to many of these problems. Hopefully you can track it down to something more simple.
Let us know. I chased the same problem for a while. I just had to back my timing down.
Good luck.
..WeathermanShawn..
My point is once you can determine if it is legitimate engine pinging, my approach is to just continue to gradually lower the timing until you no longer hear it. Granted some will argue peak combustion power is always found just short of the the 'pinging threshold', but I did not find that true in my case.
Two easier ways to determine if it is legitimate pinging. Does higher octane fuel eliminate the sound, or does either significantly lowering or raising the timing exasperate the sound. I think the quality of gas varies and contributes to many of these problems. Hopefully you can track it down to something more simple.
Let us know. I chased the same problem for a while. I just had to back my timing down.
Good luck.
..WeathermanShawn..
There is another possibility, which is preignition.
Like from a lean injector at high cylinder pressure,
a hot spot, etc. If it doesn't go away with stupid-
low advance then it may be preignition. That will
not respond to spark position because it is a burn
that is not spark-initiated. And knock sensors are
sometimes fancy-processed (not sure about this
PCM, but some) to gate out noise that occurs
outside a window that follows spark event. A
preignition will not be under spark control so knock
retard strategy would not help anyhow.
Like from a lean injector at high cylinder pressure,
a hot spot, etc. If it doesn't go away with stupid-
low advance then it may be preignition. That will
not respond to spark position because it is a burn
that is not spark-initiated. And knock sensors are
sometimes fancy-processed (not sure about this
PCM, but some) to gate out noise that occurs
outside a window that follows spark event. A
preignition will not be under spark control so knock
retard strategy would not help anyhow.
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From: Pittsburgh, PA
I will check the exhaust tonight and remove some timing. I did add Lucas Octane booster which is supposed to be one of the best. I am going to try a something other than Sunoco on my next fill up... Maybe Exxon, Shell or BP (Amoco)
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I had a similar noise...it turned out it was a vacuum line rubbing my firewall when I stood on the gas pedal...soon as I re-oriented the line and routed it a bit better so it wouldn't rub, the noise went away.
I've also seen a vacuum leak sound kinda like an audible pinging noise...might want to check the intake gaskets and make sure the intake is torqued properly.
I've also seen a vacuum leak sound kinda like an audible pinging noise...might want to check the intake gaskets and make sure the intake is torqued properly.
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