[V8] Re: Re: cold weather killing gas mileage (AHA!!!)

[Buchholz, Steven]

It is times like this when having a VAG1551/1552 equivalent may be of
the most assistance.  With ProDiag you can capture data from the ECU as
the engine is running and see what inputs the ECU is getting for the
engine temp and such.  The V8 isn't as forthcoming as newer cars, but it
might add some clues ... 

I don't think you reported codes that the mixture adaptation was unable
to keep up ... if you were getting them it would indicate that perhaps
you could use a fuel pressure regulator ... 

Steve B 
San Jose, CA (USA)
> 
> K, I'm fairly sure that my temp sensors (I've replaced three with OEM
parts)
> nor my thermostat, though I could always be wrong.
> Other than those, what else could cause me to be running permanently
rich?  Oh
> yeah, something that I thought about: if I have an air leak somewhere,
would
> the engine combat that by adding extra fuel to the mix?  The reason I
ask is
> because in the morning, whenever I start up the car, it will stumble
whenever
> I put it in drive or reverse and act like it will die (revs hit lower
than
> 400), then it is fine the rest of the drive.  In fact, the idle will
either be
> fine or high, depending on how the car feels, I guess.
> So, what causes a car to run rich, and where should I check for an air
leak?