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  #1  
Old 10-24-2010, 09:36 AM
051 051 is offline
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Join Date: Oct 2009
Posts: 57
1993 300 E 2.8 idle fluctuation

Looking at buying a 1993 300 with 2.8. It seems to be in good shape, runs and drives nicely but at idle it fluctuates badly. When doing this there is a little black somke and smells like it is flooding out.

Is there a common problem with this? Can someone suggest what I might be getting into. I'm a pretty decent mechanic and plan on doing the work myself.

Thanks for any help.
51

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  #2  
Old 10-24-2010, 11:01 AM
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Join Date: Mar 2006
Location: Australia
Posts: 115
Sounds like an ignition problem with unburnt fuel.

Could be plugs, connectors, ignition wires, coils, engine wiring harness or ECM..?
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  #3  
Old 10-25-2010, 05:58 PM
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Join Date: Apr 2010
Location: New Plymouth, New Zealand
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Could be many things.

Get the codes read, then you may have a better idea of where to go.

Could be MAF, or Electronic throttle body, or something as simple as ignition components.

Or even the wiring loom failing. The insulation falls of and they short out.
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  #4  
Old 10-26-2010, 10:26 AM
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Join Date: Jun 2000
Location: Plano, TX
Posts: 2,578
As mentioned, start by pulling the error codes. Sounds like it's in default mode - quite possibly the MAF is dead and the computer is guessing at the air/fuel mixture. That would be code 4 on pin 8. Don't ask how I know this
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  #5  
Old 10-26-2010, 10:33 AM
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Join Date: Oct 2004
Location: Baton Rouge La
Posts: 2,632
eta
__________________
1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]
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  #6  
Old 10-26-2010, 12:15 PM
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Join Date: May 2009
Posts: 398
Engine wiring harness upper and lower and coil pack.

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