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Engine rough idle 12 to 15 seconds after stop, code p0171
engine rough idle 12 to 15 seconds after stop, code p0171 p0174 came up on scan tool so I replaced maf replaced pcv hose im not detecting any vacuum leeks from vacuum lines but I do get engine to rev … read more
camerontech
camerontech
20 year experience diagnostic technician
class a
1,068 satisfied customers
2006 explorer getting lean on bank 1 and 2... changed fuel
2006 explorer getting lean on bank 1 and 2... changed fuel filter and MAF sensor... still trowing codes 10 minutes after clearing … read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
24,495 satisfied customers
99 F350 SuperDually with v10 2150, 99 F350 Super Dually with
99 F350 Super Dually with v10 215k miles. Was running rough, would overheat under mild load, MPG went from 10 to 7, had a ping during acceleration. Then the sparkplug in the no. 4 cylinder blew out. ODBII reader showed P1401, P0171, P0300, P0307, and P0174. I fixed the spark plug using a heli coil. I replaced the thermostat and flushed the radiator, replaced the spark plugs, coils, fuel and air filters, and fuel injectors. ODBII reader showed P1401, P0171, and P0174. Replaced the DPFE sensor, and the hoses going to the DPEF, EGR valve, fuel pressure regulator, and MAF sensor.. I took a full can of break cleaner and emptied it by spraying every connection and seam in the engine compartment no apparent vacuum leaks. The MPG went up to 11. ODBII reader showed P0455, P0171, and P0174 Replaced 3 oxygen sensors (single CAT and exhausts), fuel pump (fuel gage did not work anyway), fuel cap, both rubber hoses connected to the fuel tank (looks like evap lines), and 3 rubber hoses that connect the solid lines on the frame to the engine (looks like evap lines). ODBII reader showed P0455, P0171, and P0174. I have checked and cleared the OBDII several times during this process. ODBII reader still reads P0455, P0171, and P0174. I have used 2 tanks of gas during this trouble shooting process. I am at a loss what to do next about the lean codes. … read more
Mike S.
Mike S.
Vocational, Technical or Trade Scho
8,398 satisfied customers
Daughter's 2004 ford Taurus has intermittent rough idle
daughter's 2004 ford Taurus has intermittent rough idle issues. it did have CEL on before but Idk if it still does. I think the codes were lean condition. cleaned the MAS and the IAC. … read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
26,187 satisfied customers
Its idling very rough, I changed out the plugs and there was
its idling very rough, I changed out the plugs and there was no change.....No codes have come to light and the car has 200000 on it … read more
Gunvir Singh
Gunvir Singh
1,949 satisfied customers
2001 Ford Truck F150 1/2 Ton - Pickup 5.4 L: 2001 Ford Truck
2001 Ford Truck F150 1/2 Ton - Pickup 5.4 L, ROUGH IDLE, HUNTING IDLE, STALL, CODE P0171 AND P0174… read more
A. Penland
A. Penland
Ford Senior Master Technician
Vocational, Technical or Trade School
7,702 satisfied customers
free star: I have a Ford free star 2004. Chechnya engine light.
I have a Ford free star 2004. Chechnya engine light. Codes are p0174,p2197,p0153. Runs rough at idle and wants to die. Have replaced big vacuum hose… read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
26,187 satisfied customers
ford explorer: 2003 ford explorer 4.0 v6 put head gasket on. reset
2003 ford explorer 4.0 v6 put head gasket on. reset timing numerous times throwing codes p2195 p2197 p0300 p0302 runs rough at idle anything above idle runs great need help out of options… read more
Mike S.
Mike S.
Vocational, Technical or Trade Scho
8,398 satisfied customers
2003 Ford Expedition: p0171..vacuum leak..check engine light comes
I have a 2003 Ford Expedition (5.4), the check engine light is on and I get the following codes (P0171-P2198-P2196-P0174). I have had it looked at 3 different times over the last 4 years and they will… read more
Dieseljunky2
Dieseljunky2
Locomotive Mechanic
Ford Certified Technician
3,589 satisfied customers
1998 F-150: check engine..first start..mile or two, it runs fine
I have a 1998 F-150 and the check engine came on. When I first start the engine and drive a mile or two, it runs fine. After that, it runs really rough. Went to Auto Zone and their meter said it's eit… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
60,524 satisfied customers
2005 Ford Explorer: vin..E. car was stalling when at stop in gear
I have A 2005 Ford Explorer 4.0 vin E. car was stalling when at stop in gear. Got codes p0301, p0300, P0316. I changed the plugs and cleared the codes. Car ran ok for about 15 to 20 minutes and starte… read more
Dodge expert
Dodge expert
ASE MASTER TECH, REPAIR FACILITY OWNER
High School or GED
3,636 satisfied customers
2000 Ford Contour: with 110,000 miles..worn..car ran..idles rough
I have a 2000 Ford Contour with 110,000 miles. I was getting a flashing CEL at idle and upon the recommendation from this site, I changed the plugs and wires. The plugs were really worn and after the … read more
Ford snr master
Ford snr master
master technician
Vocational, Technical or Trade Scho
1,806 satisfied customers
2001 Ford explorer sport: 4wd..rough idle..runs fine..error codes
2001 Ford explorer sport 4wd. It has a really rough idle but otherwise runs fine. The first set of error codes were P0171 P0174 ( I think - the errors were too lean bank 1 and bank 2). I've tried a fe… read more
CTFordTech
CTFordTech
Auto Technician
Vocational, Technical or Trade Scho
4,894 satisfied customers
98 Ford contour: 2.0L..MIL..PO171..I check for vacuum leaks
I am working on a 98 Ford contour 2.0L with MIL on. Code I have is a PO171. I check for vacuum leaks cannot find any. It seems to run fine. Except for the occasional stumble upon hard acceleration. I … read more
A. Penland
A. Penland
Ford Senior Master Technician
Vocational, Technical or Trade School
7,702 satisfied customers
2004 expedition: idling rough im getting codes..p0171 p0174
I have a 2004 expedition with 4.6 and it is idling rough I'm getting codes P2195 P2197 P0171 P0174… read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
26,187 satisfied customers
2002 Expedition: stall..accelerating..Check engine light came
I have a 2002 Expedition that suddenly developed a rough idle/stall at idle/over accelerating at times from idle buy it's self. Check engine light came on, codes read at AutoZone P0174 & P0171 from OB… read more
JACK
JACK
AUTO SERVICE TECH
High School or GED
12 satisfied customers
98 Expedition: It idles really rough but runs good..speeds..rpms drop
I have a 98 Expedition. It idles really rough but runs good at normal speeds. However if the speed is slow enough that the RPM's drop down to 1200 to 1500 it seems to kind of surge. It keeps throwin t… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
60,524 satisfied customers
I have a 1996 ford bronco with 2 lean codes(po171-174).
I have a 1996 ford bronco with 2 lean codes(po171-174). Could a bad vapor management valve/vapor canister purge valve cause this? I can eliminate the 2 lean codes by removing that side from the vacuum… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
60,524 satisfied customers
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Meet the Experts:

Ron

Ron

ASE Certified Technician

26,187 satisfied customers

23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs

Chris (aka- Moose)

Chris (aka- Moose)

Technician

60,524 satisfied customers

16 years experience

John Mc

John Mc

Ford Technician

5,495 satisfied customers

19 years Ford Lincoln Mercury experience

Chuck

Chuck

ASE Certified Technician

1,685 satisfied customers

33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance

Cam

Cam

Journeyman Automotive Technician

10 satisfied customers

GM Grand Master Technician 2007. 14 years Automotive experience.

Mike V.

Mike V.

Auto Service Technician

1,994 satisfied customers

25 years experience on all makes and models, Licensed NYS Inspector.

Richard

Richard

ASE Certified Technician

1,535 satisfied customers

12 years at a Ford Lincoln/Mercury and Jaguar dealer as a technician and shop foreman.

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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