1989 740GL Won't start

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#21

02-16-2016, 09:00 PM

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It's definitely a tick and not a knock. The warmer the engine the less it's noticeable. The engine sounds better the higher the RPM. The tick basically goes away above 2,200rpm. Really sounds like an injector .

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#22

02-17-2016, 06:17 AM

act1292

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More than likely it is either valve lash or piston slap. You can check the valve lash using a feeler gauge. The lash values should be on a plate on the top of the drivers side wheel well (in the engine compartment).

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