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Old 12-19-2006, 12:53 PM
TTCummins's Avatar
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Join Date: Dec 2006
Location: Ypsilanti, Michigan
Posts: 240
Clicking noise from under hood

When I bought my 1979 300cd it occasionally made this noise that sounded like a relay kicking on and off under the hood. When I started it this morning, it was reaaaallyy cold, it made this noise when ever i was accelerating or maintaining speed, it sounded almost like a machine gun. But as soon as I let off the gas it would stop. Has any body run into something similar or know what the possible cause could be? It seemed to do it a little less when everything was warmed up but it was definitely still there. Any help would be greatly appreciated.


Kurt Kiefer

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Old 12-19-2006, 11:40 PM
Mustang_man298's Avatar
Man of the fire
Join Date: May 2006
Location: Shingletown,Ca
Posts: 941
That almost kinda sounds injector related.....does it run kinda rough or with a slight miss until its warmed up?
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Old 12-20-2006, 01:21 AM
MattBelliveau's Avatar
Gotta another one...
Join Date: Jun 2005
Location: NE Ohio
Posts: 1,685
This may seem obvious, but you're sure its coming from under the hood, right?
1989 300E 144K
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Old 12-20-2006, 01:43 AM
greasybenz's Avatar
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Join Date: Nov 2005
Location: San Francisco, CA
Posts: 2,082
my guess is a lifter tick but i dont know if the lifters tick the same way 603's do.
05 E320 CDI
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Old 12-20-2006, 04:13 AM
Jorn's Avatar
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Join Date: Nov 2003
Location: TheFlyingDutchManInHollywood
Posts: 6,188
It's an injector, looks like the new cleaner diesel fuel is messing with our old cars.

Black on Black 1979 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE
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