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Car Forum / MINI / April 2004strange vacuum advance problem
Hi all, Ever since I fitted an aldon breakerless electronic ignition system (the kind that simply fits under the distributor cap) I' ve been having a really weird problem. the tube that goes from the vacuum advance on the distributor to the carburettor seems to get blown off. I' ve never actually seen this happening, but after a short drive I open the bonnet and the tube is disconnected. I've also tried sucking air from the tube and the vacuum advance seems to be working. Any ideas? thanks Dantiri Hi Dantiri sounds like the car is running rich, (Excessive fuel consumption) I had the same problem years ago, and it took ages to figure out what was happening, gas enters the vacuum pipe, travels down to the diaphragm on the dizzy, leaks in to the rotor chamber and explodes when the rotor lets a spark go,,,,,,,, mine started blowing the cap off eventually, There again I could be totally wrong ;-) Fitzy > Hi all, > Ever since I fitted an aldon breakerless electronic ignition system (the [quoted text clipped - 7 lines] > > Dantiri > Hi Dantiri > sounds like the car is running rich, [quoted text clipped - 6 lines] > There again I could be totally wrong ;-) > Fitzy This doesn't make much sense. The diaphram is supposed to be a closed end. Even if the diaphram is leaking, with vacuum at the manifold end, you won't get air and fuel mixture migrating to the distributor. You are totally correct Graham, > The diaphragm is supposed to be a closed end. Even if the diaphragm is > leaking, with vacuum at the manifold end, you won't get air and fuel > mixture migrating to the distributor. What if the engine stops on a compression stroke, then rolls back, forcing fuel back in to the manifold , looks like smoke coming from the carb, I think most people have seen this happen when the ignition timing is out, this raw fuel/gas leaks back , either through a faulty diaphragm, or through a poor connection on the vacuum pipe, when the engine is cranked , it explodes and blows the weakest connection off Fitzy > > Hi Dantiri > > sounds like the car is running rich, [quoted text clipped - 10 lines] > > The diaphram is supposed to be a closed end. Even if the diaphram is > leaking, with vacuum at the manifold end, you won't get air and fuel > mixture migrating to the distributor. |
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