4.5 issues - Mercedes-Benz Forum

 
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post #1 of 1 (permalink) Old 04-29-2009, 07:48 PM Thread Starter
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Date registered: Jan 2009
Vehicle: 75 450SEL
Location: Utah
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4.5 issues

I have an interesting problem with my 116.
I've been trying to get the air/fuel mixture right as someone messed it up before I got the car. I got it running ok with some ignition advance, but it's still a bit rough. I put a louder exhaust on it cause the old system was junk.
So now I hear the engine snapping at cold idle and on acceleration.
I checked the plugs today and now I'm more confused...
Left bank looked great, clean dry plugs. The right bank, the opposite. Black coating all around.
What could cause this? One side rich?
I have verified the injectors don't leak, the fuel system holds pressure for hours. What am I missing? What can cause the snapping sound from the exhaust? I have the D-jet system, and have gone through the diagnosing thread.
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