2003 ford Taurus--Revving while braking

Asked by Jul 26, 2015 at 12:33 PM about the 2003 Ford Taurus LX

Question type: Maintenance & Repair

Back in January, I was driving home and had an issue of my car revving up while I
was pushing the brake down.  Took it to my usual mechanic....he said a couple of
hoses were old and cracked and i needed a new PCV valve and IAC valve.  Things
were fine for a month.  then it did it again....so I took it back and he replaced a couple
more hoses and the intake manifold gasket and said it was good to go.  
Again....one month later (to the day), the same revving issue popped up.  He checked
everything again and said couldn't see anything wrong with it but he did replace the
PCV valve again.  Before I even picked the car up, he had to replace the PCV valve a
third time cause it acted up on him.  
His third PCV valve he said he got from a completely different maker and vendor and it
was fine for the last 4 months of so.  Of course, I'm here today because it acted up on
me again today.  
Now, by acting up, I mean I hit the brake and the RPM's got from 1500 to over 4500
and (obviously) the car doesn't slow down.  Back in January when it first happened, I
could let off the brake and reapply and the car would slow normally but as the problem
has reappeared it's gotten harder and harder to stop.  Once, even having to slam it into
park to keep from going into a busy intersection.   Throwing it in neutral just makes the
engine rev even higher so that option is out.   
I plan on talking with my guy for a long time tomorrow to figure this out.  If he is going
to throw his hands in the air I guess i will check the dealer out.  any suggestions I can
throw his way of things to check/look for????  other than this the car is in great shape
and I only drive 15 miles a day to work in it so i need another year or two max from
this car.  it has no other issues at the moment.

5 Answers

78,425

4500 RPM's sounds more like a engine control malfunction than a vacuum leak. Has your tech tested the system using a "live data" scanner? Possibly an ISC unit, Throttle stepper motor, or even a wiring problem, something like a rubbed through spot that only happens when you are braking or a loose ground.

Best Answer
16,850

Check the brake booster check valve.

16,850

If the brake booster check valve is bad it will allow the air in the booster to go back into the engine when brakes are applied. This valve is only supposed to let air into the booster it is like a one way valve let's air in after brakes are applied.

Well....after three days with the mechanic, the car has not acted up once. (figures) I have a feeling a vaccuum leak is ruled outand now it's into a computer or wiring issue. Think I'll take it over to the Ford dealer and let them take a crack at it. I guess if they can't find anything, I will have to trade it in. I don't think I can drive it anymore knowing it's a accident waiting to happen. the car only has 130,000 miles on it and other than this issue it's been reliable the last couple years. was hoping (praying) for one more.......

16,850

Replace the brake booster check valve it does not cost that much and it may solve your problem its worth a try.

Your Answer

Add photo

Related Questions

  • 2003 Ford Taurus brake drum measurement 1 answer

    Doing a brake job on my 2003 Ford Taurus. How do I know if the drums can be turned? How much has to be left?

    2003 Ford Taurus SES

    -

    Maintenance & Repair

  • 2003 Ford Taurus stuck in park 2 answers

    The car starts, but is stuck in park??

    2003 Ford Taurus SES

    -

    Maintenance & Repair

  • 2003 Taurus. 8 alternators in 2 years??? 47 answers

    My 2003 Ford Taurus has gone thru 8 alternators in the past 2 years. I replaced the alternator on Monday and it went out again on Friday. I bought the lifetime guaranteed rebuilt from Pepboys so I've ...

    2003 Ford Taurus SES

    -

    Maintenance & Repair

  • 2003 Ford tors won't go in any gear 6 answers

    I was driving my 2003 Ford Taurus up a hill and out of nowhere it stopped and would not driving any further I have had no problems with the transmission slipping or not going into gear till last ...

    2003 Ford Taurus SEL

    -

    Maintenance & Repair

  • Brakes and rotors 2 answers

    Can brakes and rotors from a 2001 ford taurus fit on a 1999 ford taurus

    1999 Ford Taurus SE

    -

    Maintenance & Repair

Taurus

Looking for a Used Taurus in your area?

CarGurus has 22,554 nationwide Taurus listings starting at $1,499.

ZIP:

Search Ford Taurus Questions

Ford Taurus Experts

#1 Tom Demyan
Tom Demyan
Reputation 3,330
#2 lightGear
lightGear
Reputation 1,810
#3 dandyoun
dandyoun
Reputation 1,770
View All

Related Models For Sale

Used Chevrolet Impala
997 Great Deals out of 36,594 listings starting at $1,800
Used Ford Explorer
1,507 Great Deals out of 73,531 listings starting at $985
Used Ford F-150
3,436 Great Deals out of 206,231 listings starting at $1,273
Used Ford Mustang
718 Great Deals out of 38,848 listings starting at $1,999
Used Honda Accord
1,254 Great Deals out of 78,205 listings starting at $969
Used Chevrolet Malibu
1,157 Great Deals out of 80,222 listings starting at $2,495
Used Toyota Camry
1,521 Great Deals out of 101,099 listings starting at $700
Used Ford Focus
1,250 Great Deals out of 60,007 listings starting at $1,295
Used Nissan Maxima
499 Great Deals out of 25,223 listings starting at $1,500
Used Nissan Altima
1,332 Great Deals out of 84,997 listings starting at $1,795

Used Cars For Sale

2017 Ford Taurus For Sale
21 listings starting at $22,544
2016 Ford Taurus For Sale
28 Great Deals out of 9,959 listings starting at $16,997
2015 Ford Taurus For Sale
60 Great Deals out of 1,847 listings starting at $10,495
2014 Ford Taurus For Sale
64 Great Deals out of 1,392 listings starting at $9,898
2013 Ford Taurus For Sale
79 Great Deals out of 1,747 listings starting at $7,995