1966 289 help
#1
1966 289 help
i have a 1966 289 mustang and ive been having this problem where after it is driven for a little while it makes a "puff" noise from the exhaust when under acceleration and it doesnt really change with how hard i push it.ive changed the spark plugs,spark plug wiring,ignition coil,radiator,water pump,thermostat,all hoses,fuel pump,oil,oil filter. over heating isnt a problem,and there is no kind of smoke or anything coming out of the exhaust.
#3
If you've got the stock exh. manifolds check the 'donut' gaskets between the exh. manifold and downpipe. Some are soft gasket type, I swapped to the all steel ones and cleaned up both surfaces and solved my exh. leak that I could hear. Probably not constant because it was more evident when the cylinder closest to it fired.
Jon
Jon
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