Db1

I have a 70 olds f85 rallye 350 that blows blue smoke out of the right exhaust while driving. It does smell like it's running a little rich. Any ideas why it's only comming from the right exhaust.

oldcutlass

Welcome to the site. Could be a sticking ring or valve guide seals.

Db1

Thanks I'll look into that

MDchanic

Bad vacuum modulator is not out of the question - easy enough to check: pull off hose at manifold, look / feel / smell for ATF in line. Bonus for sucking on it and seeing whether it holds vacuum or leaks.

- Eric

Db1

Thanks for the tip