So Lancerman, how do you like your Flowmaster? I put a thrush turbo on my truck and it is quieter than the stock muffler!
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| Weird exhaust noises https://slantsix.org/forum/viewtopic.php?t=14955 |
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| Author: | Jeb [ Tue Nov 08, 2005 8:38 am ] |
| Post subject: | Weird exhaust noises |
The exhaust on my car keep on poofing noises at idle. I advanced my timing to 5 degrees before top dead center because it was off by 10 degrees and now the problem has only gotten worse. The engine does'nt feel like it is misfiring because it idles steady as a rock. Could I have an exhaust leak that could be causing this? Tried adjusting the carburetor but it did'nt help any.Open for suggestons. |
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| Author: | Pierre [ Tue Nov 08, 2005 9:50 am ] |
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It'll have to be a pretty big leak to poof, usually small leaks are more of a tick or click in my experience. Have someone bunch up a rag and hold it against the tailpipe to choke it off, if its an exuast leak it will build pressure pretty quickly and make the leak more evident. Then start inspecting from the manifold backwards by ear, or a mechanics stethoscope. |
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| Author: | SlantSixDan [ Tue Nov 08, 2005 10:09 am ] |
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Poofing noises at idle, when you're listening at the tailpipe, are due to engine misfire, not exhaust leaks. The engine mounts will absorb a fair amount of misfire-induced unsteadiness, and you can't always see misfires by watching the engine. Misfires are bad; they waste gasoline and cause pollution, so it's good that you're starting in on looking for the cause. |
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| Author: | Eric W [ Tue Nov 08, 2005 10:31 am ] |
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Sounds like a burnt exhaust valve. One will cause the "poofing" sound you discribe. Hold a rag flat against the exhaust pipe. If the rag tries to suck up into the pipe when the poof happens, than its a burnt valve. Could also be a valve or two adjusted to tight. |
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| Author: | argentina-slantsixer [ Tue Nov 08, 2005 11:51 am ] |
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Quote: Sounds like a burnt exhaust valve. One will cause the "poofing" sound you discribe. Hold a rag flat against the exhaust pipe. If the rag tries to suck up into the pipe when the poof happens, than its a burnt valve. Could also be a valve or two adjusted to tight.
Good one!
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| Author: | SlantSixDan [ Tue Nov 08, 2005 12:10 pm ] |
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Well...it kind of depends on what kind of poofing noise we're talking about. If it's rhythmic (exhaust sounds like "Pluff-Pluff-Pluff-Pluff-Pluff-Pluff"), then yes, it's likely that one or more cylinders aren't firing. A cylinder may refuse to fire because of a burned or too-tight-adjusted exhaust valve, a pushrod fallen out of its rocker, a faulty spark plug, or spark not reaching that plug, a serious single-cylinder vacuum leak, or a few other reasons. But, if the poofing is random/irregular and the exhaust sounds like this: mmmmmmmmPluffmmmmmmmPluffmmmPluffmmmmmmPluffPluffmmmmmmmmmmmmPluffmmmmm then it's a misfire due to a smaller/cylinder-nonspecific vacuum leak, an ignition or carburetion problem, or other state-of-tune issues. |
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| Author: | Jeb [ Wed Nov 09, 2005 7:16 am ] |
| Post subject: | |
My exhaust noises sound like the second description Dan mmmmmpoofmmmmmmmmpoofmmmpoofpoofmmmmmmmm |
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| Author: | NewLancerMan [ Wed Nov 09, 2005 8:22 am ] |
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i love listening "reading" you guys make exhaust noises, I can hear it perfectly in my mind too. You just have to use a larger text size for that dang flowmaster I have on there. Yes Jeb, I left some rubber behind (I knew you'd ask) MJ |
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| Author: | Jeb [ Wed Nov 09, 2005 8:37 am ] |
| Post subject: | |
So Lancerman, how do you like your Flowmaster? I put a thrush turbo on my truck and it is quieter than the stock muffler!
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| Author: | SlantSixDan [ Wed Nov 09, 2005 5:37 pm ] |
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Quote: My exhaust noises sound like the second description Dan
OK, then you've got some misfiring going on...time for some systematic diagnosis!
mmmmmpoofmmmmmmmmpoofmmmpoofpoofmmmmmmmm |
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| Author: | argentina-slantsixer [ Fri Nov 11, 2005 3:52 am ] |
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if it sounds mmmprrrrrtmmmmmpooofmmmmmgrrrfffrrrrtttttrtrrrtmmmm is time to ease on the beans 
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| Author: | DusterIdiot [ Fri Nov 11, 2005 4:20 am ] |
| Post subject: | Rlmao... |
This thread reminds me of that comedy sketch "Car Noises" by the Frantics.... Jeeez... I had that same sound you describe, a proper valve lash took care of it, but in your case it might be something else too.... -D.Idiot |
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| Author: | Jeb [ Mon Nov 14, 2005 6:44 am ] |
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Fixed it. Carb was set too lean |
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| Author: | Grizzly [ Sun Nov 20, 2005 11:05 am ] |
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Quote:
But, if the poofing is random/irregular and the exhaust sounds like this:
Wow, thats what my 74 Dart Swinger sounds like...it's kinda eerie to see it spelled out like that... mmmmmmmmPluffmmmmmmmPluffmmmPluffmmmmmmPluffPluffmmmmmmmmmmmmPluffmmmmm 
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| Author: | 68barracuda [ Sun May 25, 2008 10:42 pm ] |
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BlortaBlortatatatataBlortaBlortatatatata - ignition probs + misfire on Freeflow sytem> or is it the dang beans again 
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