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Old 10-08-2001, 10:00 PM
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RunningTooHot RunningTooHot is offline
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A: they don’t actually measure intake air volume – this setup uses a vacuum signal to indicate load on the engine. It is an approximately baseball sized unit with a fairly large diameter hose from the intake manifold running to it. If yours is a 4.5, it should have a blue color code on it (3.5s are yellow)

B: This could be a combination of factors, one of which sounds like the (timing advance) weights inside the distributor are sticking. This really seems unlikely due to the propensity of the distributor shaft seals to go bad – this is why/how the injector trigger points get fouled with oil. You may want to put a timing light on it to see how the advance curve looks – does it move smoothly with increasing RPMs, or does it jump around? Also look for consistent readings at the same RPMs

Good Luck!

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