HMM... Had a similar problem in a '83 Volvo-turned out
to be a sudden failure of the computer. Or so they
said at the garage. Now I do all my own work. Takes me
months to fix a simple problem like this!George

--- Mike Vanderzanden <Brewhogger@aol.com> wrote:
> My '84 GL is running very rich.  Mileage is 10 mpg
> at best.  Blows thick
> black smoke when loaded (i.e. under acceleration).
> Down on power in general.
>  Idle speed is eratic but does not stall (yet?).
> Been driving her daily
> under these conditions for months.
> Things I've done:
> Checked/adjusted ignition timing.  Was retarded.
> Now correct (at least
> close).  Made no difference.
> Measured fuel pressure:  36 psi at idle with vacuum
> connected.  42 psi (at
> any engine speed) with vacuum line disconnected.  If
> increase engine speed
> (with vac. connected), fuel pressure decreases (yes,
> DECREASES) to about 32
> psi.
> Swapped out the air flow meter for another (used but
> serviceable) one.  No
> significant change in behavior.
> Examined the spark plugs.  All four were equally
> black and sooty.
> I also cleaned (with electrical contact cleaner and,
> in case of ground
> connections, emery cloth) and exercised all of the
> connections I could find
> on the engine management wiring harness.
> I plan to measure the Temp. II sensor resistance
> tomorrow.
> An observation:  I noticed that the position of the
> AFM wiper is about 20 or
> 25% "open" with the engine idling.  This seemed
> surprisingly high to me, but
> I have no reference.  Could be normal.  Anyone have
> any input?  I also
> adjusted the CO adjustment screw (under the plug on
> the AFM housing) and this
> had no real effect on the position of the AFM wiper.
>  Had a small effect on
> the quality of the idle.
>
> I did a mechanical rebuild on this engine two years
> ago (did not do anything
> to the fuel injection/engine management system).  It
> ran fine and gave me 19+
> mpg overall fuel mileage until this problem cropped
> up a couple months ago.
>
> Thanks for any suggestions.
>
> Mike
>
> I know that there's probably been several
> discussions in past on this
> subject, but I am new to this list and I haven't
> figured out how to search
> the archives by subject.  Maybe someone can help
> this non-savy computer user
> in this respect.
>
>

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