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

247,325

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.

19,190

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

Your Answer

Add photo

Related Questions

Search Ford Windstar Questions

Ford Windstar Experts

#1 JohnBarJB
JohnBarJB
Reputation 560
#2 T_S_T
T_S_T
Reputation 460
#3 Tom Demyan
Tom Demyan
Reputation 400
View All

Related Models For Sale

Used Honda Odyssey
232 Great Deals out of 19,809 listings starting at $1,495
Used Dodge Grand Caravan
158 Great Deals out of 24,820 listings starting at $2,000
Used Toyota Sienna
244 Great Deals out of 28,389 listings starting at $1,000
Used Chrysler Town & Country
225 Great Deals out of 14,302 listings starting at $1,995
Used Ford Expedition
432 Great Deals out of 23,891 listings starting at $1,500
Used Ford F-150
2,089 Great Deals out of 191,500 listings starting at $290
Used Ford Explorer
914 Great Deals out of 63,252 listings starting at $700
Used Dodge Caravan
606 listings starting at $900
Used Chevrolet Impala
553 Great Deals out of 35,458 listings starting at $899
Used Nissan Quest
60 Great Deals out of 2,616 listings starting at $2,995
Used Ford Escape
1,249 Great Deals out of 84,640 listings starting at $995
Used Chevrolet Astro
207 listings starting at $2,995
Used Toyota Corolla
956 Great Deals out of 68,723 listings starting at $1,800
Used Honda Accord
1,057 Great Deals out of 66,823 listings starting at $1,000

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.