I have a Taurus Wagon 1994 with 3.8 engine with about 200k miles on it.
Sometimes when I come to a stop at a light the engine does not slow down
immediately. In other words Im driving along in street traffic then come to
a stop light. I come to a stop but I can still feel the engine not fully
coming to an idle. I know if I took my foot off the brake I would go at
20-35km. If I keep my foot on the brake then after 20 seconds or so the car
will calm down and idle at the regular speed. Its like sometimes it take too
long to bring it to Idle.
Is there any advice on what I should be looking at to alleviate this
My first guess would be a sticky Idle Air Controller or throttle.
You can check the throttle easily by having somebody move the gas pedal,
then release it. Check at the throttle body to see if it fully returns
quickly, and doesn't get stuck almost at the end. You may need to try this
with a cold or hot engine, as gunk or other stuff in the throttle body
could be causing the throttle plate or shaft to stick.
The other cause is the Idle Air Controller (IAC). When your foot is off
the throttle, the throttle plate is essentially closed. The IAC bypasses
some air around it to control the idle speed. It's just a rod that moves
in and out to vary the amount of air. If it gets gunked up, it may not be
With 200K miles, your throttle body probably needs a good cleaning, both
inside and out.
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Thanks for you advice.
Should I just get some spray cleaner and spray it all around the linkages
etc. would this clean it up if this is the problem ? What would anyone
recomend. eg. Gunk or some fancy Carb cleaner. Or do you think this aproach
is a little drastic!
I agree that the intake most likely needs cleaned. Get some good throttle
body cleaner. It should say "throttle body" on it somewhere, and oxygen
I'd say that your problem is more related to the throttle cable though.
Clean the intake first, of course, since it's possible that's it, and it's
cheaper and easier than replacing the cable.
For more info, check out www.tauruscarclub.com
Don't know about the '94 Taurus, but my '94 T-Bird has an explicit
warning not to clean the throttle body. Seems there is some kind of
coating on the inside of the throttle body and cleaning agents will
damage the coating and affect engine operations. FWIW
Christopher Brown wrote:
That warning is there for good reason. If you use carburetor cleaner
instead of throttle body cleaner, you will damage emissions components. The
warning label is to keep folks who are ignorant of that fact from messing up
their cars. Throttle body cleaner is perfectly safe in throttle bodies and
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