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



Sounds like you have lost control pressure regulation in the fuel 
system. Since it appeared suddenly, I would say you have something 
going on with the fuel pressure regulator or the seal on the control 
valve has become damaged or is leaking - among other things. Can you 
rev the engine?

A very rich fuel mixture will ruin the cat before you hurt the O2 
sensor. Don't let the cat get too hot - glowing red for very long will 
do it in.

The next time you start it, disconnect the cold start valve - there is 
already too much fuel in the system - no need to dump more. Let it warm 
for a few minutes and see if you can rev the engine. A couple of heavy 
acceleration moves on the throttle valve may dislodge contamination - 
or make it worse - either way you are closer to solving the problem.

If the problem continues, check to see if any fuel is coming out of the 
fuel pressure regulator vent - none should. Disconnect the vacuum lines 
on the fuel pressure regulator and see if any fuel is running out - 
none should.

Next take the cold start valve out and check to see if it is leaking 
when it is suppose to be off.

The last thing I can think of right now would be to disconnect the 
electrical connection on the frequency valve and see if anything 
changes.

To isolate the problem you will probably need to put the fuel gauge and 
system diagnosis tool on. It gets more complicated from this point.

Harold McElraft - 3354



--- 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.
>



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