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I have a 2002 ford f-150 with a 5.4 I have a code po171. Now
I have a 2002 ford f-150 with a 5.4 I have a code po171. Now before Anything else, I have been to a shop and a dealership. The intake had a leak, so that was changed, I personally have changed out all… read more
roy
roy
Associate Degree
3 satisfied customers
2004 f150 5.4 I start the truck it runs fine then as it
2004 f150 5.4 I start the truck it runs fine then as it idles it goes up and back down and then starts to die out… read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
I have a 2007 f150 5.4 it has a rough idle or misfire, it is
I have a 2007 f150 5.4 it has a rough idle or misfire … read more
APenland
APenland
Ford Senior Master Technician
Associate in Industrial Management
3,186 satisfied customers
2002 ford f150 5.4 runs rough and missfire replaced
2002 ford f150 5.4 runs rough and missfire replaced manifolds intake manifold and cleaned tb… read more
AZTechBrian
AZTechBrian
ASE Certified Technician & Shop Owner
Vocational, Technical or Trade School
732 satisfied customers
F150 V6 2.4: 2006 F150 V6 4.2 is shaking violently in idle
2006 F150 V6 4.2 is shaking violently in idle and when accelerating. Seems to run better at 70mph but fuel usage is way up. I had it tested and codes said it was missing on cyl 1& 4. I've changed plug… read more
APenland
APenland
Ford Senior Master Technician
Associate in Industrial Management
3,186 satisfied customers
2004 e-450 shuttle bus v10, engine after warm up will not
2004 E-350 shuttle bus v10, engine after warm up will not accelerate past 2000 rpms showing po171 code, runs bad replaced the fuel pump and filter, cleaned the maf sensor, no vacuum leaks idles ok whe… read more
chris
chris
Ford tech at a dealer
Associate Degree
2,764 satisfied customers
ford F150 Pickup 4x4: 1999 ford f150 truck cab and 1/2 6 4.2
1999 ford f150 truck cab and 1/2 6 4.2 coding po171 po174 both. Have been working and done several things, first cleaned then replaced the MAF replaced upstream o2's both left and right, found small h… read more
Kenny Z
Kenny Z
Ford Senior Master Technician
High School or GED
16 satisfied customers
ford f150: I have a 1998 ford f150 i ran a diagnostics test
I have a 1998 ford f150 i ran a diagnostics test on it and two codes came up one (po171 sys too lean bank 1) and po174 sys too lean bank 2) what do i do to correct this problem. thanks… read more
Ron Z.
Ron Z.
Vocational, Technical or Trade Scho
2 satisfied customers
I have a Error code P0356 Ignition coil F Failure Primary/Secondary
I have a Error code P0356 Ignition coil F Failure Primary/Secondary Circuit malfunction,can you help? Does the "F" tell what cylinder has the problem ?… read more
davehop
davehop
Diagnostic Technician
Ford Master Certified Technician
1,171 satisfied customers
97 ford: 32 psi pcv system is ok egr system ok & no vac leaks
I am working on a 97 ford crownvic. it has now power has codes po171 po174 p1131 & p1151 fuel presser KOEO is 32 psi PCV system is ok EGR system ok & no vac leaks… read more
CTFordTech
CTFordTech
Auto Technician
Vocational, Technical or Trade Scho
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1999 windstar: codes are po401, po171, po174, po304..wrong with my van
I have these problems with my 1999 windstar the codes are po401, po171, po174, po304, and po306 could tell me what these mean. and what is wrong with my van, and how would cost to fix all of this? tha… read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
Ford F150: V6..It shows that PO171 System too lean (cylinder bank no.1
Hi I scan a ford F150 V6 4.2 and It shows that PO171 System too lean (cylinder bank no.1) What is cylinder bank no.1 means Then it shows PO302 Cylinder no.2 misfire detected When I check the fuel pump… read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
25,182 satisfied customers
1996 FORD F-150: FUEL TANK..STALL..THE FUEL PRESSURE..TROUBLE CODES
I HAVE A 1996 FORD F-150 4.9L WITH DUAL FUEL TANKS,WITH IT SWITCHED TO THE FRONT FUEL TANK,SOMETIMES WHEN YOUGO TO START THE ENGINE IT WILL ALMOST STALL,LIKE IF IS STARVING FOR FUEL BUT THEN IT WILL S… read more
Larry
Larry
Ford Senior Master Tech.
Vocational, Technical or Trade Scho
16 satisfied customers
replaced maf sensor, checked fuel pressure..fuel pump..hose..intake
I keep getting PO171, PO174 Bank 1 and 2 too lean codes. I have cleaned and replaced MAF sensor, checked fuel pressure and replaced fuel filter and fuel pump. Changed PCV valve and hose connecting to … read more
Anthony
Anthony
Master Automobile Technician
Vocational, Technical or Trade Scho
8,789 satisfied customers
1996 Ford Explorer: cylinder..vehicles..run several tanks..cars
I am having codes show on my 2003 f150 six cylinder that are PO171 system to lean bank 1 and PO174 system to lean bank 2. Also on my 1996 Ford Explorer PO174 system to lean bank 2. Can you give me an … read more
Scottdagoalie
Scottdagoalie
Vocational, Technical or Trade Scho
1,663 satisfied customers
2001 f150: eng..2 trouble codes po171 po174..o2 sensors
having problem with 2001 f150 ford 5.4 eng. had 2 trouble codes po171 po174. truck has 150.000 miles so tried changing o2 sensors. now trouble code po171 has come back have checked for vaccum leak, fu… read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
25,182 satisfied customers
Ford F150: service engine soon..engine soon light, codes..po171
Ford F150-service engine soon light, codes po171 and po174 -------------------------------------------------------------------------------- when I hook up the scan the following code comes up PO171 an… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
29,223 satisfied customers
2000 explorer sport: runs great..the check engine light came..cyl
my 2000 explorer sport v-6 sohc when cold start in morning will not idle, engine surges until it finally picks up rpm, after warm up it runs great, have replaced o-2 sensors, idle air control valve, c… read more
Mike V.
Mike V.
Auto Service Technician
Subaru and Nissan factory training.
1,591 satisfied customers
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Meet the Experts:

Ron

Ron

ASE Certified Technician

25,182 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

29,223 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

1,591 satisfied customers

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

Richard

Richard

ASE Certified Technician

1,524 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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