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Old 03-07-2002, 07:18 PM
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What makes W126 500 Euro motor PING?

It's not the gas. Only use the high octane Chevron. Car does not run hot. When I first got the car, it only did it in full throttle, and since I decided it was better not to floor it, I let it slide. But a few weeks ago, it started doing it on light throttle in 2nd and third gear. I have the timing set @ 5 BTDC with vacuum line disconnected @ 600 rpm. Anybody run in to this? Can super lean condition cause this perhaps? Got me stumped. I'm getting ready to replace the distributor.
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Old 03-08-2002, 01:12 AM
MikeTangas's Avatar
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Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
The 4.5's like 10*BTC with vacuum line disconnected and plugged (at least mine does ). Upon connecting the vacuum line to the distrubutor it yields about 5*ATC at idle. No ping, no run-on, easy hot starts. Might be the 5.0's like that too.
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

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