74 Harley
- Reaction score
- 453
- Thunderbird Year
- 1962
Start by removing the vacuum hoses and plug the ports off. Start car with a vacuum gauge hooked up. If it runs well adjust carb. You could have a bad booster.
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Frankie the Fink
- Reaction score
- 468
- Thunderbird Year
- 2002
A major exhaust manifold leak is usually heard as a tick or snap which increaes with RPM and is loudest when the engine is cold. Remember 4 stroke engines, are suck, squeeze, bang, blow; and the parts on the "suck" side of things are prone to vacuum leaks - meaning the induction parts such as carb, intake manifold and somtimes PCV systems. I've never had a vacuum leak at a valve cover or exhaust manifold. As noted, if you have a power brake booster its worth checking that as well.
Also I've prob put two dozen Pertronix conversions in vintage cars, there was a spate of Meixo-built Flame Thrower coils that had intermittent failures, the latest ones seem to be fine, but if yours is an older one I'd replace it.
Also I've prob put two dozen Pertronix conversions in vintage cars, there was a spate of Meixo-built Flame Thrower coils that had intermittent failures, the latest ones seem to be fine, but if yours is an older one I'd replace it.
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