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60 TR3A Serious internal vaccuum issues..

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JimVO

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I have had TR's since the 60's. I recently started having fouling plug problems. I rebuilt the SU's and had them checked on a flow meter, with vaccuum applied, they are both sucking gas. I installed them and the TR will now not fire. If I spray gas into the plug chamber, it will fire then, so I am getting spark. When I put palm of hand over carb, there is no suction. I have checked the intake for leaks, it is OK. There is plenty of gas getting to the carbs, fuel pump is fine. Did a cold compression test, all four cyls are 150-155. Running out of things to check, any suggestions would be appreciated. There just appears to be no internal vaccuum from the engine that would draw the gas up thru the needle and jet. Help, I know this is going to be something obvious and stupid.

Jim VO
 
How did you check the intake for leaks? Did you cover both carbs when you felt for suction?

All I can think of is maybe the manifold is hung up on the locating pins (creating a large vacuum leak), or the throttle plates are fully closed.

One triple-check you might try is to remove the dome & piston, look down through the top and see fuel in the jet. I have seen float valves that stuck closed from just a few weeks of inactivity (probably combined with deposits from infrequent usage).

PS, Welcome to the asylum! I'm not quite old enough to have owned a car in the 60's, but I fell in love with the first TR3A I ever saw in the early 70s (and my Dad still has it).
 
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