Cold Backfire
Thread Starter
Instructor
Joined: Mar 2009
Posts: 209
Likes: 1
From: Denver CO
Cold Backfire
All engine people, i put a rebuilt 350 in my 74 to replace a bad l-82 and for a while it was running too advanced and backfired a lot. Retarded the timing and tuned it up much better, but its still getting backfires on cold starts, and seems to have no low end torque or power. It gets off the line like a granny but upper rpms seem good. any ideas would help
Thread Starter
Instructor
Joined: Mar 2009
Posts: 209
Likes: 1
From: Denver CO
It actually ended up being a faulty vacuum advance. It was stuck open and causing all kinds of acceleration problems. I replaced it and the car runs like new! If it was cam timing that would have really been bad but thankfully not
Racer
Joined: Jan 2009
Posts: 422
Likes: 1
From: portland or
heh. i should look into that. my 79 is slow at start as well...low idle as well. where is this vacuum advance? pic would help tons
Thread Starter
Instructor
Joined: Mar 2009
Posts: 209
Likes: 1
From: Denver CO
vacuum advance
the vacuum advance is the small metal canister thing on the side of your distributor. It should have a rubber line coming from the carburetor to it. It is held in by one screw if you take the distributor cap off and can be interchanged with a new one. ill try and get a pic when im off work
Racer
Joined: Jan 2009
Posts: 422
Likes: 1
From: portland or
the vacuum advance is the small metal canister thing on the side of your distributor. It should have a rubber line coming from the carburetor to it. It is held in by one screw if you take the distributor cap off and can be interchanged with a new one. ill try and get a pic when im off work
