Bfg

I have an exhaust leak on my 65 Cutlass, is there a way to detect the location? I’ve been under the car while it’s running but can’t seem to pinpoint the leak. Is there a common area where they can develop a leak? I’m thinking pouring transmission fluid down the carb will produce smoke to make it easier to detect, has anyone tried this?

gs72

I learned this from an old muffler tech. He used his torch with just lit acetylene and flashed it around anywhere around a potential leak with the engine running, and the leak would blow the flame back. I tried this at home with a regular propane lighter and got the same results. This is a good way to detect leaks.

67OAI

With engine off, place hose from shop-vac (in blow mode) into tailpipe while car elevated; crawl under and locate where the air is coming out. In case of dual exhausts you may have to block the other tailpipe with a rag.

Greg Rogers

Maybe all 3 of those ideas will work, but wanna find it really easily? Have car running at idle, stick a piece of 5/16" vacuum hose in your ear -NOT TOO FAR!! Hose about 4 ft long. Now run other end of hose around exhaust- you will hear where leak is- I know, too simple.. Works great...

Bfg

With all of those ideas suggested, I’m sure I’ll be able to detect the leak. Thanks for all your tips guys!

matt69olds

this is by far the best method.

Bfg

I will try that first