Accelerating on its own, P0171 P0174 jumping tach meter, accelerates when steering turned

5

Asked by Feb 11, 2016 at 11:44 PM about the 2001 Ford Windstar LX

Question type: Maintenance & Repair

2001 Ford Windstar, 206K
Has always been a great car, but the last month or so, it has went crazy. It
accelerates on its own, jumps forward at lights & stop signs and I have to
keep brake pressed so it doesn't take off on me...It also is jumping from
500-1K on the tach and sounds like it is going to stall (when its not revving
up to 3K) so, I end up giving it some gas at times to keep from stalling and
holding brake at same time so it doesn't take off.

When I turn the steering wheel while setting idle, the car revs up to 2-2.5K.

I have replaced the spark plugs, Cleaned the EGR Valve, replaced the
throttle sensor, replaced the fuel filter, replaced the Idle control valve,
CLEANED the MAF, changed the air filter...still with no luck and scared to
keep spending money on a 2001 Windstar that is basically not worth much,
but I can't afford a new car, so I have almost no choice but keep nickeling
and diming me :(  Any suggestions would be greatly appreciated. ( I have
also looked for Vacuum leaks, and cant seem to find any, but going to
recheck that and also read about replacing the PCV Valve hose) Anything
that I am possibly missing as to why my car accelerates on its own? I shift it
in gear and it literally takes off! Also I have a motor mount that needs to be
replaced also. And my brakes also keep going out...they just completely go!
Brake goes to the floor and ZERO brakes, I keep adding fluid, and it keeps
disappearing! Every 4-5 days, I have to add 1/2 bottle of brake fluid. Its not
leaking (I park on cement) and I have checked around all the tires, no
leaks.. I have read that fluid is possibly backing up in the brake booster? I'm
a single mom of 2 little ones that feels incredibly unsafe, but like I said, it's
my only means of transportation. Any help would be appreciated.

2 Answers

223,545

P0171 and P0174 are classic codes for a vacuum leak. Which means unmetered air after the MAF is being detected by the system. Check all your rubber hoses around the intake and PCV. You can spray some carb cleaner around those areas while the engine is running and if the idle goes up, there is your leak. Also a leaky gasket on the upper manifold can do the same thing. You can have your mechanic perform a "smoke test" to pinpoint the leak if you can't find it on your own.

17,660

Sounds like you have a bad brake booster check valve also a bad master cylinder.

Your Answer

Add photo

Related Questions

  • P0171, P0174 check engine codes - possible electrical problem? 24 answers

    I have a 1999 Ford Windstar 3.8L with the check engine light on and reading codes p0171 & p0174. after a bachelors degree worth of research I have taken many steps to troubleshoot and fix the pro...

    1999 Ford Windstar 3 Dr STD Passenger Van

    -

    Maintenance & Repair

  • does your ford windstar stall on acceleration? 13 answers

    does your ford windstar stall on acceleration? I NEED to know how to find out if the van stalled when I accelerated How do I find out if the van stalled when accelerated? I had been having problems w...

    2001 Ford Windstar LX

    -

    Maintenance & Repair

  • anybody have their Windstar's rear axle or subframe mounts to break/fail AFTER the recall repair parts were installed? 78 answers

    i bought my '02 LX in Oct'11 and the recall repairs were freshly done by the local Ford Dealer that sold it to me. I'm curious to know if the recall repair parts out there are doing their job.

    2002 Ford Windstar SE Sport

    -

    Maintenance & Repair

  • 2000 windstar won't turn over. 9 answers

    2000 windstar won't turn over. New Battery & starter, checked the Relays & fuses all good. Starter energizes but wont turn over.

    2000 Ford Windstar SE

    -

    Maintenance & Repair

  • i have a 1999 ford ranger 4.0l 4x4 with p0171 and p0174? 6 answers

    I have p0171 and p0174 codes, I have replaced the upstream o2 sensors, fuel filler neck, mass air flow sensor, ect temp sensor and I still have the check engine light come on! I am running out of ide...

    1999 Ford Ranger XLT Extended Cab Stepside SB

    -

    Maintenance & Repair

Search Ford Windstar Questions

Ford Windstar Experts

#1 JohnBarJB
JohnBarJB
Reputation 520
#2 T_S_T
T_S_T
Reputation 460
#3 Tom Demyan
Tom Demyan
Reputation 390
View All

Related Models For Sale

Used Chrysler Town & Country
441 Great Deals out of 20,514 listings starting at $1,695
Used Honda Odyssey
350 Great Deals out of 27,974 listings starting at $2,295
Used Dodge Grand Caravan
307 Great Deals out of 34,367 listings starting at $1,995
Used Toyota Sienna
293 Great Deals out of 28,851 listings starting at $900
Used Dodge Caravan
903 listings starting at $3,999
Used Nissan Quest
95 Great Deals out of 3,089 listings starting at $995
Used Ford Explorer
936 Great Deals out of 73,995 listings starting at $750
Used Ford Escape
1,116 Great Deals out of 90,856 listings starting at $1,295
Used Ford Focus
697 Great Deals out of 58,722 listings starting at $995
Used Kia Sedona
140 Great Deals out of 9,358 listings starting at $1,999
Used Ford Expedition
414 Great Deals out of 24,740 listings starting at $1,999
Used Ford F-150
2,690 Great Deals out of 212,354 listings starting at $1,000
Used Chevrolet Venture
607 listings starting at $2,795
Used Ford Taurus
254 Great Deals out of 20,514 listings starting at $1,500