He can drive without vacuum advance, that won't hurt anything other than the peak horsepower. He should plug the carburetor port, though, as it will leak air into the mixture at part throttle. It sounds like his car has either mixed up spark plug wires, or perhaps it has jumped a tooth on the timing gear. If it is overheating, that is very likely the cause. It is time to put the engine on an analyzer for diagnosis - don't just start changing parts - you'll only waste money, and perhaps cause more problems. Why don't you let him drive your Buick?!? Dick Benjamin ----- Original Message ----- From: Philippe COURANT <> To: Fwdlk <L-FORWARDLOOK@xxxxxxxxxxxxx> Cc: <mailing-list@xxxxxxxxxxxxxxxx> Sent: Wednesday, May 22, 2002 2:17 PM Subject: IML: vacuum advance diaphragm leaking and other problems > Hi, > My Imp is ready to the 1000 miles trip (Chrysler Anciennes #2 > meeting) but my friend ('59 Coronet) has some problem with his > car: no power, the car stalls at breakaway, very difficult or > impossible to start again, seems that engine misses some > cylinder(s) when it runs. He replaced points, condenser, coil > without results. He tried another carb (new), no results; he put > some gas in the carb and starting is always hard. He's checking > ignition wires and sparkplugs because it seems that it's a > ignition problem. > > He found that the vacuum diaphragm is leaking (when he sucks or > blows, the air goes through). As he has no spare diaphragm what > could happens if he blocks the vacuum line from carb (to have no > vacuum leak). Could he drive the car without vacuum advance ? > > > > -- > Philippe COURANT (Pau, France) > Imperial 57 Crown convertible > Buick 58 Roadmaster sedan > > - American Car Club de France (ACCF) : http://www.accf.com > > - Chrysler Imperial France : http://www.ifrance.com/c-i-f > > - Cadillac " Standard of Excellence " : > http://www.ifrance.com/accf-cad > > - SportsCars : http://www.ifrance.com/accf-sprtcar > > > >