RE: [DML] RE: Strange acceleration problem

["Joseph Kuchan" <josephkuchan@xxxxxxxxxxx>]

Sure...

Because a cold engine requires a richer mixture than a warm engine. That's 
because when the engine is cold, fuel drawn into the cylinder condenses on 
the cylinder walls, effectively leaning out the mixture. That's why the 
warmup regulator enriches the mixture when the engine is cold and partly why 
you have a cold start valve.

Anyway, if we assume that the fuel filter is partially clogged your car 
would be running leaner due to impared fuel delivery. It would possibly run 
okay when warm, but since the car NEEDS a richer mixture when cold, and 
can't get it due to the clogged filter, the filter coiuld cause symptoms 
only when cold. If it gets progressivley worse, eventually it would cause 
problems even when the engine is warm.

-Joe Kuchan


>From: doctorDHD@xxxxxxx
>Reply-To: dmcnews@xxxxxxxxxxxxxxx
>To: dmcnews@xxxxxxxxxxxxxxx
>Subject: [DML] RE: Strange acceleration problem
>Date: Sat, 22 Oct 2005 15:38:38 EDT
>
>
>
>Can someone explain to me how a bad fuel filter can cause hesitation and
>back firing only when the engine is cold?
>
>
>
>Thanks,
>
>D² & 6530
>
>Dan,
>
>Before you try to trouble shoot the fuel injection I would  suggest 
>changing
>the fuel filter. That corrects the symptoms you describe  more than half of
>the time. Do you know when it was last changed? A bad CPR  won't allow you 
>to
>accelerate at all for a few minutes with a cold engine so  I doubt it's 
>that.
>
>Here is something ponder over. When I start my car  after sitting for
>the night it starts up fine. When I give it gas to get out  of my
>driveway and up the street, I notice I lose acceleration. I then  here
>a slight backfire in about 3-4 quicks pops. After this the car  runs
>fine and I don't get it again until the next day after  sitting
>overnight. Any thoughts on the cause of this?  Thanks!




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