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9 answers

my van does the same thing , but every 6 months or so, I buy that stp gas stuff in the red bottle in the auto department/store. i pour it in my gas tank and fill up my tank w/ gas. after i drive enough to empty that first half a tank or so, i stop having that problem - until the next time. :)

2006-09-08 07:02:20 · answer #1 · answered by Kitten2 6 · 0 0

No make, no model, no year, no mileage... Oh well, I'll give it my best shot... These days most everything is fuel injected so let's run with that.

With your foot off the gas pedal, the butterfly valve in the throttle body closes and limits the air to a small amount getting past the butterfly plate through a little slit cut in the side. A little bit of filth in the wrong area and this little slit can get clogged up which limits the airflow past the point where the engine can run and it dies.

Now let's turn on the AC...

The AC compressor is a large load on the engine... when you are running with the AC off, you will notice exactly when the compressor comes on when you turn it on. It's that big a load. The manufacturer knows this and doesn't want the car to die when it is idling with the AC on so they engineer a circuit that raises the idle speed when the throttle plate is closed (off the gas pedal).

If I were you, I would remove the air cleaner inlet tube to the throttle body and clean out the area in and around the butterfly valve (throttle plate) you will see there. Note the slit or any other allowance for air to get by that throttle plate and make sure it is clean too. I am sure you will find some gunk in there. Don't just use any old cleaner either... use carburetor or throttle body cleaner... I can't remember what kills oxygen sensors but you can kill an O2 sensor easily enough with the wrong cleaners getting into the engne.

Good luck!

2006-09-08 06:07:13 · answer #2 · answered by Les 4 · 0 0

If you are going to consider correcting any fault with your automobile, you should first obtain a service manual. You can get a manual from just about any auto parts store.
It is not true that your air conditioner stays on after the engine dies. The only thing that stays on is the fan that blows cool air into the car.
I would say that your engine is an old one and has lost power. There is one simple test you can to in order to isolate the problem.
Immediately before coming to a stop, turn off your air conditioner. If the engine does not die, then you will know that the air conditioner is loading down your engine and causing it to stall.

Probable causes, Your engine is slow on ignition timing. It will lose power under those conditions.
Possible solutions: Reset the timing or advance the idle speed to 800 rpm. minimum
You may have a friend that can assist you with the necessary corrections.

If I knew what type of auto you have, I could advise you in more detail.

Good Luck

2006-09-08 06:02:57 · answer #3 · answered by Anonymous · 0 1

Your computer automatically increases the idle when the AC is on.

So - you have one of the following issues:

O2 sensor is going bad
MAP sensor is going bad
IAT (Inlet Air Temp) sensor is going bad
TPS (Throttle Position Sensor) is going bad

Or you may just need a tune up... it's hard to say with newer cars.

Easiest way to find out is to take it to your local parts store an ask them to hook it up to their handheld device.

2006-09-08 06:47:13 · answer #4 · answered by Tim B 4 · 0 0

idle is set too low ( ac has switch that increases idle speed when on )

2006-09-08 05:55:17 · answer #5 · answered by Anonymous · 0 0

could be your oxygen sensor...my car was doing that & thats how I fixed it. You could also run it into a auto store and have them do a diagnostic on it. Good Luck!

2006-09-08 05:56:12 · answer #6 · answered by chartneck 3 · 0 1

could be a low idle sensor

2006-09-08 05:59:13 · answer #7 · answered by eldridgejoe 3 · 0 1

idler sensor going bad

2006-09-11 15:01:25 · answer #8 · answered by duc602 7 · 0 0

I think u may need a major tune up.

2006-09-08 05:58:59 · answer #9 · answered by FORD on FIRE 4 · 0 1

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