2001 Taurus - Stays revved up and acts like it is in cruise control mode. - Taurus Car Club of America : Ford Taurus Forum
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post #1 of 17 (permalink) Old 05-15-2019, 12:17 AM Thread Starter
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2001 Taurus - Stays revved up and acts like it is in cruise control mode.

Hello All;

Just put a semi-new battery in the car, and cranked it, all was good on Monday night.
Then, Tuesday came, and I went to work.
Cranked the car up, and it idled up like normal and then idled back down.
I took off from the house and by the time I got to my first stop.
I pressed the brake and the car acted like it wanted to jump the curb.
It did this ALL DAY LONG.

What in the world would have caused this issue to happen, with a battery going dead and being replaced?
I checked to make sure that all hoses were still connected, making sure I did not accidentally discount one while messing with the batteries over the weekend. But everything seems to be the same.

Any idea's on what I would need to check or do or change, in order to get this thing to rev back down?
Also, while driving down the road, I can remove my foot from the gas peddle, and it will stay at the same speed for quite a ways, almost like it is in cruise control.
Almost like it has a sticky peddle, as my dad used to call it in the 80s.
Like the throttle is stuck open.
I check the cables and they are fine.

Open for suggestions.
Gas prices are WAY to damn high to be playing the "I wanna go faster game" with this car.

Wayne
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post #2 of 17 (permalink) Old 05-15-2019, 02:08 AM
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This may solve your issue. My Taurus had a similar issue.


It probably isn't related to the battery, as the only thing that'd could even be affected by the battery would be the ECU, but I don't see that forcing the throttle open.
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post #3 of 17 (permalink) Old 05-15-2019, 06:35 AM
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First thing to do is get the codes from the PCM. Could be the cable issue noted above, could be a large vacuum leak, IAC stuck open, or a number of other things.
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post #4 of 17 (permalink) Old 05-15-2019, 09:45 AM
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^+1

Take a look for any vacuum line that may have been knocked loose or damaged during you recent underhood forays

It's SHO time!


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post #5 of 17 (permalink) Old 05-15-2019, 12:07 PM Thread Starter
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For starters, I am not sure WHY I did not check the codes before posting this message.
So, with that said.
Here we go with ALL the codes.

P1506
I did the test of disconnecting the IAC and it DID NOT change anything. The idle did not go down or nothing.

P0171
P0174
P0304
P0305
P0306
P0136

Yep, there were 7 of them crazy damn codes.

So, I am going to assume the IAC needs to be replaced.
And once it is replaced, then I can check on the rest of the codes to see if they cleared.
Would that be the correct assumption?

Except for the
P0171
P0174

They have been here for a few weeks now.

Last edited by carrzkiss; 05-15-2019 at 12:53 PM.
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post #6 of 17 (permalink) Old 05-15-2019, 02:21 PM
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One of the most common causes of Ford P0171 and P0174 lean codes is a dirty mass airflow (MAF) sensor. ... The MAF sensor can also be contaminated by fuel vapors that back up through the intake manifold and throttle body when the engine is shut off. The vapors can leave a waxy coating on the sensor wire.
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post #7 of 17 (permalink) Old 05-15-2019, 03:07 PM
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Engine speed/power is managed by air flow. PCM adds fuel to match the air flow. Sources of air.
Throttle plate
PCV
IAC
Leaks.


I had PCV stuck open and it would cruise @ 30 mph on level ground. I have had IAC on another car, not Bull, and it would cruise ~40 on level ground. That one when you stopped and shut it off and restarted would return to normal. Any throttle plate blocking has un limited speed.


First you want to be sure the throttle plate is closing all the time and the cruise cable is working. Throttle plate should never be adjusted. It should be closed as much as possible without sticking.
Leaks will result in high long term fuel trims at idle.


-chart-
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post #8 of 17 (permalink) Old 05-15-2019, 04:42 PM
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My 2001 Sable does this to some extent, not as bad as yours. Other with our model have the same problem. I've searched everywhere online for an answer and find nothing definitive...not even a tbs on this issue. I believe this is a congenital defect on these cars and Ford wants to sweep this problem under the rug.
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post #9 of 17 (permalink) Old 05-15-2019, 06:51 PM
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Why would you replace the IAC????? Replacing the IAC will do nothing but make you $60+ poorer. You have pretty bad vacuum leak or stuck open PCV valve causing the high RPM and likely also causing the missfire codes.

05 Taurus SEL Duratec - my daily driver
04 Taurus SES Duratec - wifes car - TOTALED
06 Taurus SE Vulcan - wifes new ride
95 Taurus GL Vulcan winter car
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67 Honda 450 Super Sport - completely customized
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post #10 of 17 (permalink) Old 05-15-2019, 07:44 PM
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With that collection of codes unmetered air is a far more likely explanation than a bad IAC.
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