Popping sounds at the muffler but not the tail pipe
#1
11-10-2017, 05:12 PM
Popping sounds at the muffler but not the tail pipe
Is this a timing issue or muffler crapping out issue?
Just started the other day. Haven't ran the truck too much as I just got it last month. Other runs before now have been without incident to the engine or exhaust (did have some other issues lol).
If this is timing related, what would cause this all of a sudden? What numbers do I want to see in regards to the timing?
Just started the other day. Haven't ran the truck too much as I just got it last month. Other runs before now have been without incident to the engine or exhaust (did have some other issues lol).
If this is timing related, what would cause this all of a sudden? What numbers do I want to see in regards to the timing?
#2
11-10-2017, 05:32 PM
Originally Posted by Brnfree
Things to think about:
If you're running extra rich or you have a miss you will have un-burned fuel in your exhaust system.. and if / when that unburned fuel ignites it will go "pop".
Often the fuel ignites further down-stream in the exhaust system.. where there's enough oxygen to burn.
If it's too rich because of the choke you can block open the choke to see if that helps.
Too much fuel pressure for the carb can make it rich, but usually the flooding will be obvious.
To adjust the timing first mark your current setting so you can come back to it. Then you have to loosen the hold down bolt at the base of the distributor. I think it's 1/2''. To advance the timing rotate the distriburor clockwise. As you advance the timing the idle speed should increase.
If the timing is over-advanced you will get pinging under moderate throttle and it will start kicking back against the starter when you try to start it.
If you're running extra rich or you have a miss you will have un-burned fuel in your exhaust system.. and if / when that unburned fuel ignites it will go "pop".
Often the fuel ignites further down-stream in the exhaust system.. where there's enough oxygen to burn.
If it's too rich because of the choke you can block open the choke to see if that helps.
Too much fuel pressure for the carb can make it rich, but usually the flooding will be obvious.
To adjust the timing first mark your current setting so you can come back to it. Then you have to loosen the hold down bolt at the base of the distributor. I think it's 1/2''. To advance the timing rotate the distriburor clockwise. As you advance the timing the idle speed should increase.
If the timing is over-advanced you will get pinging under moderate throttle and it will start kicking back against the starter when you try to start it.
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