I am not a mechanic, but does it ever seem like you are assuming this is a complicated (read: expensive!) problem. Since the ethanol seemed to clear up the problem temporarily, the first thing I would do would be to check for water in the gas tank, then start fueling at another place or use a different grade of gas.
Dave '03 9-5 Arc
Salutations:
>
> "Fred W." wrote:
> >
> > > I wrote here before and everyone was so kind and some of you even sent
> > > me direct emails.
> > >
> > > I have a 9000 CD 1989 Sedan and I notice when I am driving on the
> > > highway that it seems to lose speed. It almost feels like its
> > > changing gears ( yes it is Automatic). Anyway per a friends
> > > suggestion I added to the tank a bottle of dry gas. This seemed to
> > > fix the problem as I did not experience any of the bucking or slowness
> > > problems for a month. I was sooo happy and I could hit the gas and it
> > > would fly....
> > >
> > > Unfortunately the drop down in speed while I am driving is starting
> > > again. So I wanted to know if adding the dry gas really did help and
> > > if so what is the reason the dry gas helped. I want to know if there
> > > is something that I should get fixed that the dry gas temporarily > > > fixes.
> >
> > Sounds like you might be getting some misfiring. Does your 9k have DI
> > (Direct Ignition)? If so, step one should be to replace the spark plugs
> > with the correct NGKs called out for that engine. If not, it could be
> > plugs, plug wires or distributor cap or rotor.
> >
> > -Fred
>
> Check for oil leak running along on the bottom of the distributor cap (if
> so fettled).. Google alt.autos.saab for - violent bucking - as I think
> I've posted some guff about it on my own 89 9000T CD.. It turned out to be
> a .10 cent o-ring..
>
> If you are grounding a wire to the block with even the lightest film of oil
> - it'll misfire and the engine management system will read that as a knock
> and, correctly as far as it's concerned, shut off the fuel momentarily -
> under boost is where you get that bucking 'thang..
>
> If you are running DI - then there is nothing to do but replace the unit as
> I gather it's doing much the same sort of thing engine management wise..
> It will save the block, piston and crank because it's cutting fuel across
> the whole rail to stop the whole engine when one or more holes misfire..
> While it's a huge pain in the ass - it tears up your mounts instead - it
> actually makes some sense in that it is hard to chew up a particular piston
> over time - which is usually what happens to older port injected motors
> without advanced engine management..
>
> After that - check for NGK's as suggested, check the air filter and if
> you've been getting great and/or lousy mileage lately - check your fuel
> pump and injectors..
>
> However, as it may be that dry gas did it's job (someone said it was for
> clearing up water in the tank) - I'd looking around the top of your fuel
> tank with a mirror on a stick and around the fuel pump looking for rust or
> broken gasket..
>
> Happy motoring - if you are messing around the fuel tank - be very careful
> about the electrical connections and try to do it with the doors and trunk
> open on a windy day.. Disconnect the battery - but you will need to have
> your radio codes if you want to use the audio system again sometime.. >
> --
>
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