Vacuum Leak Test with Cigar?

I've been having some positive AF learning at idle along with some roughness, that seems to get worse as the TGVs open. I recently had the stealership install a Perrin turbo inlet which they had to remove the IM to do. This makes me suspect bad IM gaskets or cracked IM.

Anyway, I was wondering if I could smoke test this with a cigar, by blowing the smoke through the BPV vac line to saturate the IM with smoke. If anything comes out its a leak... If my theory is correct, the PCV should hold the pressure as long as I plug the BPV hose between puffs.

Will this work? Any other ideas on what might be causing the fuel addition and rough idle?

It's worth a shot, can't hurt...

Remove the IM for the install ?

They use new gaskets?

Originally Posted by RWebb

Remove the IM for the install ?

They use new gaskets?

Yeah I knew the install was a pita but didnt think pulling the IM was completely necessary...

I asked the service manager if they had the IM gaskets to replace them after the removal and he said yes, but 9 out of 10 times they don't need to be replaced...

I know the 07+ LGTs have issues with this but not the 05s, so I reluctantly took his word for it...

Should I be concerned about the MAP sensor being affected by the cigar smoke and plug it up. Id prefer not to, but don't wanna risk anything going bad.

Just picked up a Rocky Patel 1990 and plan on giving this a go tonight