Ford

Have Ford questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

2004 f150 5.4 I start the truck it runs fine then as it

Customer Question
idles it goes up and...
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
Submitted: 11 months ago.Category: Ford
Show More
Show Less
Ask Your Own Ford Question
Answered in 2 minutes by:
9/10/2017
Ford Mechanic: john -aka eauto, The Car Guy replied 11 months ago
john -aka eauto
john -aka eauto, The Car Guy
Category: Ford
Satisfied Customers: 17,495
Experience: ase tech over 15 years in the field
Verified

is the engine light on? any codes? any vacum leaks?

Ask Your Own Ford Question
Customer reply replied 11 months ago
No but I just bought the truck and put new cats and pipe and the guy I bought it from said it was doing this because it needed cats
Customer reply replied 11 months ago
No vacuum leaks best I can tell how do you test for vacuum leaks
Ford Mechanic: john -aka eauto, The Car Guy replied 11 months ago

and it has no codes? spray areound with carb cleaner when ya hit the vacum or intake leak the idle will change

Ask Your Own Ford Question
Customer reply replied 11 months ago
No just Im monitors not complete I will scan it again
Customer reply replied 11 months ago
The battery had to be replaced it was dead and shot
Ford Mechanic: john -aka eauto, The Car Guy replied 11 months ago

yeah if ya run it for a little while im sure it will kick a code..if it hasnt allready

Ask Your Own Ford Question
Customer reply replied 11 months ago
Bank 1 and 2 lean po171 and po174
Ford Mechanic: john -aka eauto, The Car Guy replied 11 months ago

thats a vacum leak check the elbow at the pcv valve its on the rear of the engine

Ask Your Own Ford Question
Customer reply replied 11 months ago
I will in the am it's dark and rainy
Ford Mechanic: john -aka eauto, The Car Guy replied 11 months ago

any luck?

Ask Your Own Ford Question
Customer reply replied 11 months ago
No luck just sprayed around the intake and vacuum lines no change
Ford Mechanic: john -aka eauto, The Car Guy replied 11 months ago

you locate the pcv valve... ? if the pcv hose is not leaking then next step is a mass sir flow sensor

Ask Your Own Ford Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a ford mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask john -aka eauto Your Own Question
john -aka eauto
john -aka eauto
john -aka eauto, The Car Guy
Category: Ford
Satisfied Customers: 17,495
17,495 Satisfied Customers
Experience: ase tech over 15 years in the field

john -aka eauto is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on.

Rich DUSA

Because of your expertise, you armed me with enough ammunition to win the battle with the dealer. They are installing a fuel filter and fuel pump at no charge to me.

MollyUSA

I needed help with my car on Saturday morning....got a response in 5 minutes, and it was the perfect solution. Thanks again to your service.

Jason V.Kirkland, WA

I do know, after going though this with JustAnswer, that I can somewhat trust my mechanic but I will always contact you prior to going there.

BRNew Jersey

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

< Previous | Next >

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.

< Previous | Next >

Related Ford Questions
I have a 04 f150 new style with a 5.4. stalls after idling a
HI I have a 04 f150 new style with a 5.4 . stalls after idling a bit . stumbles then dies . Starts right up and no missing then slowly idles down and then stalls. I smelled something while cranking ju… read more
HDGENE
HDGENE
Master Technician/Lead Technician
Associate Degree
2,835 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
APenland
APenland
Ford Senior Master Technician
Associate in Industrial Management
3,186 satisfied customers
I bought 2007 f150 5.4 when i am going down the highway at
I bought 2007 f150 5.4 when i am going down the highway at 55 and I start to slow down my truck start to jerk and wants to die then I push the gas pedal it some time it comes out of it… read more
Eric
Eric
Auto Technician
589 satisfied customers
F150: P0305, 307, 308, 345,300. Truck wont start. Changed
P0305, 307, 308, 345,300. Truck won't start. Changed plugs and nothing different. Did compression test an they are between 173 and193. Changed out the FPDM as it was falling apart and that helped. Tru… read more
ricardo hohl
ricardo hohl
automotive instructor
Associate Degree
1,818 satisfied customers
my 2000 f150 xlt, 5.4 liter , started reving up high and dropping
my 2000 f150 xlt, 5.4 liter , started reving up high and dropping down low....dies at stops signs are light...runs rough after dieing, also at around 30 mph it startes shifting in and out...does anyon… read more
Brian
Brian
Ford Senior Master Certified Shop Forema
Vocational, Technical or Trade Scho
1,228 satisfied customers
2004 ford f150 5.4 auto start the truck up a little noise
2004 ford f150 5.4 auto start the truck up a little noise in the engine but you give it a little throttle to back out and it starts to make a loud lifter noise and want to die which it has sometimes n… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
29,223 satisfied customers
2004 f150: oil pressure..cold start..driving down..last a few seconds
I have a 2004 f150 with 5.4 and sometimes the engine rattles but there is no drop in oil pressure. Irattles for about three seconds when cold start up and it will do it sometimes when hot and driving … read more
APenland
APenland
Ford Senior Master Technician
Associate in Industrial Management
3,186 satisfied customers
2004 ford f150 fx4: 4x4 5.4 trans was backing up herd..clunk
2004 ford f150 fx4 4x4 5.4 trans was backing up herd a clunk will not back up sounds like in netural goes foward fine… read more
Tim
Tim
Associate Degree
3,172 satisfied customers
2004 f150: fuel filter..Check engine light came..idle air control
Just had complete tune up with fuel filter changed and four new 02 sensors. Check engine light came on codep0506, idle air control valve. Was told my truck 2004 f150 5.4 does not have one. I cleaned t… read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
25,182 satisfied customers
2008 ford f150: cab..backing..crazy miss firing/timing
I own a 2008 ford f150 Supercrew cab ....it has a 5.4 litter 3 valve engine. Her is the problem. At a low idle or when backing up at a low idle the engine goes into a crazy miss firing/timing. I went … read more
Steve
Steve
Ford tech Specializing in electronics
Associate Degree
1 satisfied customers
2001 Ford F150 King Ranch: L..the Truck cranks..runs great..wont idle
I have a 2001 Ford F150 King Ranch w/ 5.4 L engine. For the last month the Truck cranks and runs great in the morning to get to work. I go out at lunch and it wont idle. Revs up and die's. I can keep … read more
Ted G.
Ted G.
Technical/Sales Trainer
Vocational, Technical or Trade Scho
4,376 satisfied customers
01 f150: really rough..engine dies..Under acceleration..it runs fine
have a '01 f150 supercrew w/5.4. Been running really rough at idle, now engine dies at idle. Under acceleration power seems good and it runs fine. Service engine light when off and gave codes: po300, … read more
Fordanswerman
Fordanswerman
Ford Senior Master Technician retired
Associate Degree
2,912 satisfied customers
2000 f150: sometimes it will.once..road it runs fine.
I have a 2000 f150 5.4 v8 Recently after i start it,the truck will not idle. sometimes it will. once i get on the road it runs fine. its not cutting out or running rough, it just will not idle. and wh… read more
Tim West
Tim West
Service Manager
Computer/ Automotive certifications
16 satisfied customers
1998 F150: V..it idles very rough and even stalls..few seconds
I have a 1998 F150 with 5.4 V-8, the truck is having difficulty idling. When the truck is in drive at stop lights or in park at parking lots it idles very rough and even stalls at times. If you goose … read more
Kenny Z
Kenny Z
Ford Senior Master Technician
High School or GED
16 satisfied customers
F150: sticky lifters and noizy motors but its still..bearing..serviced
I have a 04 F150 5.4 liter I have a nock in the motor it seems to be only at idle cold or hot it stays the same I put some stuff in at the oil chage for sticky lifters and noizy motors but its still t… read more
APenland
APenland
Ford Senior Master Technician
Associate in Industrial Management
3,186 satisfied customers
2002 F150: 5.4 liter engine..starts fine..accelerator..defective
I have a 2002 F150 with a 5.4 liter engine and on very cold mornings it does not run at a higher RPM when I start it. It starts fine but I have to gently apply the accelerator to make sure it doesn't … read more
Fordanswerman
Fordanswerman
Ford Senior Master Technician retired
Associate Degree
2,912 satisfied customers
2001 ford f150: truck starts..die..it gets warm but runs good when it
my 2001 ford f150 5.4 liter truck starts to die when it gets warm but runs good when it first starts… read more
Expert
Expert
Ford F-150: 5.4 engine -- 25,000 miles..2wd..it dies
04 Ford F-150 -- 5.4 engine -- 25,000 miles. 2wd -- Been in shop 4 time and produces no code -- but engine idle seems low and it dies. This has happend about 6 times in the last two days. I have to pu… read more
Fordanswerman
Fordanswerman
Ford Senior Master Technician retired
Associate Degree
2,912 satisfied customers
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.

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.

Show MoreShow Less

Ask Your Question

x