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#1 |
Senior Member
Join Date: Mar 2003
Location: St robert Mo
Posts: 2,001
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detonation question
I think I might be getting a slight detonation or pinging at about 4300 rpm in second gear untill about 4500 when it shifts and only at WOT. It is a daily driver and almost never sees those rpm. I tried lowering timing and such but can not shake it will it hurt it much?
I also have a slight collector leak think it could just be the collector leak getting loud? Thanks for your help.
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1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO |
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#2 |
7000 #'s of american IRON
Join Date: Dec 2004
Location: north tx
Posts: 883
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What frequency level is the pinging sound at, high frequency or low? also try running different octane fuel.
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#3 |
Senior Member
Join Date: Mar 2003
Location: St robert Mo
Posts: 2,001
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I would say more high but in the middle sounds almost like crackling or spark like? Hard to explain can only hear if I listen hard with out radeo and really concentrating.
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1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO |
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#4 |
7000 #'s of american IRON
Join Date: Dec 2004
Location: north tx
Posts: 883
|
I know on my mom's camaro, when the manifold leaked, it emitted a "ticking" sound from off-idle to about 1000 RPM short of red line. So it could be a loose header/manifold gasket, maybe that collector leak, or something in the engine.
What compression and octane rating do you use? |
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#5 |
Did someone say MUD?
Join Date: Aug 2003
Location: Pullman,WA
Posts: 1,089
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If you have to really concentrate then it is probably a collector gasket in the beginning stages. It will only get worse as time goes by. If it is spark knock it will sound like a bunch of marbles in a coffee can. And yes if you persists with spark knock it will do harm before it helps out any lol. And if you put higher octane fuel in it and it goes away. It is diffently spark knock and you should fix it immediatly...Later Mike
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Im in the market guys...so keep ya eyes peeled -------------------- Mini trucks are for guys who cant get it up! |
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#6 |
Senior Member
Join Date: Mar 2003
Location: St robert Mo
Posts: 2,001
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So spark knock will be louder and more prononced?
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1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO |
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#7 |
Did someone say MUD?
Join Date: Aug 2003
Location: Pullman,WA
Posts: 1,089
|
No No not exactly its hard to tell, I would check all my header and collector area and gaskets for leaks. Id even have someone rev it a little just to put that extra bit of pressure on the exhaust pipes to see if you got a little leak. If so replace gasket and see if that fixes it. It will not be louder if you have a really leaky exhaust gasket. I had one blow on me and made my truck sound like a tractor. Im not kidding. If you are pulling timing out and its still there it just doesnt sound like spark knock to me. Because it should go away if you pull timing out. Im sorry for not answering your question straight up. Its just that im not there and I can't make a positive statement without hearing it...Later Mike
__________________
Im in the market guys...so keep ya eyes peeled -------------------- Mini trucks are for guys who cant get it up! |
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