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Knocking sound from engine 850 1997

posted by  turbovlov on  Sun Sep 16 15:34 CST 2007
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last visit: Sun Sep 27 13:28 CST 2009
[RELATED]

The car is a 1997 850 non-turbo, automatic with a 20v 5 banger.

I got this previously non-running 850 to start by running 3 new brown/black wires from pin A18 on the ECM to the CMP, CLT and TPS sensors. Something was shorting these 3 and burned out pin 18 on the ECM. It started right up, but the top end was a bit noisy. It hasn't been run in 3 months or so. A little seafoam quited up the top end.

After being warmed up it started to make a sort of knocking sound. I recorded a video of the sound. It isn't the best quality in the world, but you can hear the sound. Anyone know what this is? I hope it's not a sound that requires a whole new engine, though I fear the worst. It doesn't make any other bad sounds and it runs very smoothly. This particular sound doesn't go away when you pull any of the spark plugs. The engine has oil.

video can be found here- 1.8mb
http://www.cramptonstation.com/850engine






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