When I drive my 1999 Chevy Tahoe I hear a "putt" sound as I drive. I'm not sure if it is an exhaust leak (I can't find one) or if it's time to get a catalytic converter. Is this common for this year Tahoe? I noticed that I am getting a leak of radiator fluid coming out of the block of my engine; around the head. Could the catalytic converter cause such a problem, maybe with too much pressure being pushed back to the engine???

5.7L V8

 

If the cat is clogged, you'll get a whoosing sound out of the tail pipe under hard acceleration.

Antifreeze leaking out around a head could be a head gasket.

 

I'll check it out. Thanks for the response.

 

Mine was doing that and it was the flange between the exhaust manifold and tailpipe

 

if water is coming from by the heads, it's probably your head gasket. & you would get a trouble code if the catalytic converter was bad, plus have loss of power. tap on the cat with a rubber malet. if you here rattling, then it's bad. you said you here a "putt", it's possible your engine is misfiring