Quote:
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Originally Posted by duxthe1
I'd look closer at the air pump. It only runs the first couple of minutes on a cold engine and can become Quite noisy when engaged.
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Thanks! You nailed it! I had been doing the stethoscope thing at random times not particularly doing it at startup. After searching further under smog pump, I tried listening right after startup. Sure enough the noise was there and after a minute or so, the pump clicked off and away went the noise.
Now the trick is to see if I can rebuild it with minimum $$.
Thanks,
glenmore
1991 300CE
2000 C280
1990 LS400