does a ping actually sound the way i think it does?
07-27-05, 06:45 PM
#1
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does a ping actually sound the way i think it does?
Recently, I changed the spark plug and wires in my FD and I noticed a very subtle sound coming from my exhaust.
It sounds like a bass note that would come out of a subwoofer. So, its very low pitch, sorta like a thud sound. It doesnt sound like backfire either.
Oh yeah this only happens at idle and low rpms. Is this pinging or knocking?
I appreciate any help thanks
It sounds like a bass note that would come out of a subwoofer. So, its very low pitch, sorta like a thud sound. It doesnt sound like backfire either.
Oh yeah this only happens at idle and low rpms. Is this pinging or knocking?
I appreciate any help thanks
07-27-05, 07:18 PM
#2
2/4 wheel cornering fiend
A ping or knock will have more of a metallic mid-to-high-pitched tone to it. Like striking the inside of your engine with a large ball-peen hammer. And usually by the time you hear it, your engine's done.
07-27-05, 07:35 PM
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also i dont think i have ever noticed just one they come in a series, like marbles in a tin can. think annoying snata clause costumed guys in front of stores at christmas time...
07-27-05, 07:44 PM
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2/4 wheel cornering fiend
Originally Posted by kraked
however, i wonder whats going on with my car then, are they MINI backfires???
07-27-05, 07:57 PM
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My car is very close to stock. I dont even have a DP yet. I have AST and new plugs and wires.
I noticed the sounds after the wires and plugs got installed.
You can hear it out the exhaust but I think its coming near the engine area. Maybe my precat is being dumb? I do have a DP, just not installed yet. I swear, they sound like realy tiny backfires.
I was thinking my trailing plugs could be crossed but I checked them before putting the throttle body back and stuff, so the wires should be installed correctly.
I noticed the sounds after the wires and plugs got installed.
You can hear it out the exhaust but I think its coming near the engine area. Maybe my precat is being dumb? I do have a DP, just not installed yet. I swear, they sound like realy tiny backfires.
I was thinking my trailing plugs could be crossed but I checked them before putting the throttle body back and stuff, so the wires should be installed correctly.
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07-27-05, 09:37 PM
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It's called after-burn. All RX-7's do this because they run so rich and so hot. They have a thing called an "anti-afterburn" valve that's suppose to help eliminate this. It was part of the BAC valve on the 2nd gen and part of the ISC on the 3rd gens.
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