Hi guys,this is strange
we have been workin on a 1975 350 camaro with a brand new Edelbrock carb and it idles perfect ! but after its warm,it rattles a bit,and come back to normal idle could it be fuel pump? what do you think its causing this ? Its not the only carb car i've seen doing that. what causes that little rattling ?
thanx !
Can you be more specific and define 'rattle' and tell us where it seems to be coming from? Does the engine pull down, stumble? Is there a pattern or just intermitten? Have you observed your timing at idle to see if it's fluctuating?
Ok i got news !!!!!
we were watching and putting ear on the camaro a couple of hours ago.-
its not really a rattle,the engine runs pretty smooth
but this will describe the problem perfectly
I go back to the exhaust tips to hear the engine and its amazingly steady if not for some "fffdd ffffd " sound comingfrom the exhaust pipes in a cicle
this is barely noticeable,you have to be real anal,but its there !
the "fffd pffft " sound its almost unnoticeable,you have to sit in the exhaust tip to hear it,i noticed the driver side pipe "fftt " noise its more than the right side but coming in a cicle i guess its from teh engine ....what can it be ?
its like it throws air ...maybe a non adjusted valve ?? maybe some rocker arm ? im juest guessing !
help!
thanx
Ok i got news !!!!!
we were watching and putting ear on the camaro a couple of hours ago.-
its not really a rattle,the engine runs pretty smooth
but this will describe the problem perfectly
I go back to the exhaust tips to hear the engine and its amazingly steady if not for some "fffdd ffffd " sound comingfrom the exhaust pipes in a cicle
this is barely noticeable,you have to be real anal,but its there !
the "fffd pffft " sound its almost unnoticeable,you have to sit in the exhaust tip to hear it,i noticed the driver side pipe "fftt " noise its more than the right side but coming in a cicle i guess its from teh engine ....what can it be ?
its like it throws air ...maybe a non adjusted valve ?? maybe some rocker arm ? im juest guessing !
help!
thanx
A little odd running on idle isn't that unusual. First there's always the possibility that the exhaust system leaks air some place, which is why when you plug it with the proverbial potato, it doesn't blow out. Mufflers, brackets, cat converters and simple pipe movements all contribute. Add to that the exhaust flow is not unidirectional from the engine to the chrome tip. The thing is breathing in and out especially at low idle speeds.
Then there is the weak idle mixture. High idle vacuum keeps the molecules far and few between inside the combustion chamber. Spark doesn't necessarily even result in a burn and certainly not a complete burn. So it's not uncommon to have either a misfire or late fire that makes sounds in the pipes.
So I'm not sure this is anything to get too excited about.
Bogie
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Hot Rod Forum
2.2M posts
175.7K members
Since 2001
A forum community dedicated to hot rod owners and enthusiasts. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more!