Thread: Engine won't run with choke flap fully closed

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Originally Posted by astroracer

You need to find the cam numbers. High overlap cams will cause a low vacuum signal such as what you are seeing. Although .480 isn't a lot of lift you may have a cam that doesn't generate a lot of vacuum. You need to figure this out to take the cam out of the picture.
Mark

I hadn't considered the cam and was about to have you chasing vacuum leaks or doing compression checks but Mark's right - eliminate the cam from the picture first. Might make any other checks unnecessary.