[DML] Re: Rich Mixture + hard start
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[DML] Re: Rich Mixture + hard start

Could be time for a tune-up. It sounds like one cylinder is not
firing. That can be caused by a fouled spark plug, bad ignition wire,
leaking injector. Depending on how long it is run over-rich and how
old the O2 sensor is, Yes, it may need to be replaced. I don't think
the O2 sensor is the cause of this but it can definately be damaged by
being dunked in unburnt fuel.
David Teitelbaum
vin 10757

--- In dmcnews@xxxxxxxxxxxxxxx, "Lee Edmonson" <lpedmonson@...> wrote:
> Okay, so #02566 (automatic) on the Oregon coast has been running just 
> fine on its weekly outings until recently on a cold (for the coast this 
> is near 32 F) day when I started it normally, and while letting it come 
> up to temperature in the garage it started running rough while doing 
> its normal idle hunting. This roughness includes lots of black smoke at 
> every RPM. I have read through many of the old posts about causes and 
> cures and did not see an obvious clue as to what could change sitting 
> in a garage for a week.
> This morning it would barely start and is very rough at idle with black 
> smoke. I did not let it run very long in this condition, but probably 
> had a total of 5 minutes of rich mixture and smoke. The second time I 
> tried to start it today it would try to start, but would not quite make 
> it. Has the O2 sensor been killed by the rich mixture and should it be 
> replaced before moving on to other things? Where is the best place to 
> start running down this issue?
> Lee Edmonson
> Vin #02566


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