baldone48

My 98 Taurus with 86K has an idle problem. If I’m idling with the heat or
air on the rpm's drop to 400-600, but not every time. Also at highway
speed I notice it bog down periodically. It maybe when the compressor
kicks in and out. Could this be the IAC? I don't know if this is
related, but at highway speed the lights may dim, again sporadically. I
checked the alternator and it is putting out the correct current. I did
find an alternator brace that was loose. Maybe that was causing the light
dimming thing. Any thoughts?

Bob Urz

baldone48 wrote:

> My 98 Taurus with 86K has an idle problem. If I’m idling with the heat or
> air on the rpm's drop to 400-600, but not every time. Also at highway
> speed I notice it bog down periodically. It maybe when the compressor
> kicks in and out. Could this be the IAC? I don't know if this is
> related, but at highway speed the lights may dim, again sporadically. I
> checked the alternator and it is putting out the correct current. I did
> find an alternator brace that was loose. Maybe that was causing the light
> dimming thing. Any thoughts?
>
>
Clean and check your battery cables. Check all your grounds. You might
take them off, clean them and torque them back down.

The IAC would not affect hiway speed. But if your in doubt take it off
and clean it out with carb cleaner or such. Change your fuel filter too
for good measure. You might have a plug wire going bad too. If you
don't have coil on plug ignition, start your car at night with the hood
up in a dark area and look closely at the plug wires for signs or arcing.

Bob

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baldone48

Thanks for the info Bob. I had already checked and replaced my negitive
battery cable because it kept getting a white powder on it. I didn't know
if that was a symptom of something else or another problem. I checked all
the connections and fuses. I originally thought the problem maybe the
alternator or regulator. I also had taken off the IAC and sprayed cleaner
in it.

I replaced the fuel filter today. I don't think I had since i've had the
vehicle. I will look at the plug wires.

Thanks again, Dave

I