Glow Plugs? or Glow plug Relay? e320 cdi

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merc85

MB Enthusiast
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Joined
Apr 23, 2013
Messages
9,559
Location
Harwich
Car
CLK 500
Well here's the issue,

From cold the glow plug light will come on and go out and the car will fire up instantly and runs sweet.

But then around and 40 seconds later the Glow plug light will come on for around a 60 seconds then go out and not return till the next cold start.

No codes found and no engine check light?

Car is a 53 reg e320 cdi 79k
 
It should have a stored fault code (not current), sounds like a plug needs replacing
 
Check the plugs manually with a meter.
 

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