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Mystery Misfire

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T

Trevor Triumph

Jedi Knight
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I'm not sure what is happening but the Spitfire runs very well. Then for no apparent reason it begins to miss. I thought it was an ignition problem so reinstalled the points after the electronic ignition produced the misfire. While trying anything to get home I pulled the choke on fully. The engine became smooth again although I use more fuel. What I thought was an ignition misfire could be a fuel matter. Any ideas? T.T.
 
Parially clogged fuel filter or weak fuel pump?
 
Check all the standard stuff:
1)Fuel Filter
2)Make sure all the spark plugs are tight
3)Check all the plug wires and all the wires to the coil are tight.
 
I am gonna agree with Darwin. When my spit had a very similar problem a couple years ago it was a cracked vacuum line.

Cheers,
thirsty.gif
driving.gif

Walter
 
Thanks for the suggestions. I made sure the plugs were in tight enough the filter was new. I put a hose clamp on the vacuum line and the problem has gone away for now. I still need to put some moe miles on it to be sure. Thanks again! T.T.
 
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