Ford

Have Ford questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

This answer was rated:

1986 F-150, 4.9l, just purchased the truck. Rough idle,

changed plugs (to Autolite, will...
1986 F-150, 4.9l, just purchased the truck. Rough idle, changed plugs (to Autolite, will consider going to Motorcraft). We checked the plugs a few days after changing and with minimal driving after plugs changed. Found the new #1 cylinder plug to be very dirty, in just a few days.
Show More
Show Less
Ask Your Own Ford Question
Answered in 8 minutes by:
1/22/2018
Mechanic01
Mechanic01, ASE Certified Technician
Category: Ford
Satisfied Customers: 3,773
Experience: Owner at Baltic investments
Verified

Hello my name is ***** ***** welcome to just answers! I will be assisting you with all of your vehicle questions today. Give me one moment while I review your question and come back with a answer. Please be aware I do not know your skill level or abilities so I will be asking a lot of questions and in a lot of cases we will respond to each other quite a lot before we find a solution. As far as phone calls are concerned that is the system prompting you, not me, and they do cost more money, I prefer text but in some cases a phone call is required. If I don’t answer right away or quickly in conversation I am helping another customer or have stepped out for a moment and will respond as soon as I can. Ok lets get started! Have you measured the actual spark gap at #1 ?

Ask Your Own Ford Question
Customer reply replied 6 months ago
Skill level is not high, so I appreciate your patience. I'll likely take your input to the repair shop if necessary. My initial concern is the dirty plug in only a few days, meaning, is a valve job in order?
Customer reply replied 6 months ago
All plug gaps are within spec. (.042-.046).

it could be a few things, valve job, bad rings, poor gap or spark, bad plug even though its new, timing chain issues, cam shaft lobes worn, lifter worn. If you want just log back into the question and let me know what the mechanic says and ill make sure it checks out ok before you approve any repairs.

Please let me know if you have any more questions.
Customer satisfaction is my number one goal. I would like to receive nothing less than a 5 star rating. If you feel we aren’t there yet please let me know or respond more so we can get the answer you feel is correct. You can do this rating at the box on the upper right hand corner. This will not close our chat session and at no extra charge we will still be able to talk about any other issues you may have for free! Providing a rating is the only way I will receive credit for my work with you. Negative ratings do not result in a refund so If you’re not satisfied with the work we have done so far please respond more and let’s get your question figured out. Thanks Shawn!

Ask Your Own Ford Question
Customer reply replied 6 months ago
Will do, thanks much!

your very welcome!

Mechanic01
Mechanic01, ASE Certified Technician
Category: Ford
Satisfied Customers: 3,773
Experience: Owner at Baltic investments
Verified
Mechanic01 and 87 other Ford Specialists are ready to help you
Ask your own question now
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 Mechanic01 Your Own Question
Mechanic01
Mechanic01
Mechanic01, ASE Certified Technician
Category: Ford
Satisfied Customers: 3,773
3,773 Satisfied Customers
Experience: Owner at Baltic investments

Mechanic01 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
85 4.9l overheated bad. now runs very rough at idle and
85 4.9l overheated bad. now runs very rough at idle and sometimes while driving … read more
Jaybird61
Jaybird61
Master Automotive Mechanic
2,285 satisfied customers
I have a 2000 F250 SD XLT with the V10 6.8 Ltr I just
I have a 2000 F250 SD XLT with the V10 6.8 Ltr I just finished replacing all 10 fuel injectors with Motorcraft new injectors and I also replaced the Idle Air Control valve. When I started the truck it… read more
HDGENE
HDGENE
Master Technician/Lead Technician
Associate Degree
2,835 satisfied customers
2002 F-150: check engine light came on..idling..solenoid
I have a 2002 F-150 4.6l V8 with 92,000 miles on it; at about 80,000 miles, the check engine light came on. I had the code checked, it said exhaust gas return insufficient; the truck was idling and ru… read more
Brad
Brad
Lead Diagnostic Technician
Vocational, Technical or Trade Scho
2,019 satisfied customers
1989 ford f 150: skips..idles fine, runs great when hot
1989 ford f 150 with 300 engine. skips really bad when engine is cold. idles fine, runs great when hot. everything checks out when put on the engine machine. help. thanks, jim… read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
2005 F-150 Lariat: rough..check engine light came on..misfire
I have a 2005 F-150 Lariat. Two days ago, started my truck and it was runnning rough, check engine light came on. No problems prior to this, took the truck to my mechanic, ASE certified, put the truck… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
29,223 satisfied customers
1997 ford f-150: acts like it is gonna die the check engine light came
my 1997 ford f-150 runs really rough it idles rough and when you put it in gear and give it gas it spudders and acts like it is gonna die the check engine light came on and is blinking… read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
25,182 satisfied customers
F-150: 4wd Lariat (2005) has 65000 miles..gas mileage..air filter
My F-150 Supercrew 4wd Lariat (2005) has 65000 miles and the gas mileage has recently dropped from 16 mpg to 15 mpg over time. I recently put a new k&n air filter in and change oil with castrol syntec… read more
snr master tech
snr master tech
technician
Vocational, Technical or Trade Scho
2 satisfied customers
1997 Ford F 150 XLT: running fine..Cylinder..blew..the spark plug out
I have a 1997 Ford F 150 XLT Super Cab 4X4 5.4L . About a month ago the truck was running fine with not issues at all. I was driving home and the 1st Cylinder blew the spark plug out. I drove the truc… read more
Nathan Hosier
Nathan Hosier
senior master gas and diesel technician
Vocational, Technical or Trade Scho
148 satisfied customers
1997 e250 5.4 has a miss , i..fine untill..check engine light
1997 e250 5.4 has a miss , i changed the pugs and cops because of a miss and everything was fine untill today . there is no check engine light on , i cleaned MAS . i have tired everything with no luck… read more
b-kitchener
b-kitchener
Ford dealer senior master technician
Vocational, Technical or Trade Scho
206 satisfied customers
1998 ford f150: 2nd gear..lower rpm and when not under load..idling
my 1998 ford f150 (4.6) recently had the "check engine" light flash and then stay on . We were pulling our travel trailer and had just completed a large climb in 2nd gear, It began to run rough in the… read more
Brad B
Brad B
Mechanic
Vocational, Technical or Trade Scho
997 satisfied customers
1998 ford f-150: check engine light..misfire on cylinder 1..coil pack
1998 ford f-150. check engine light on. diagnosed as misfire on cylinder 1. changed spark plugs and spark plug wires and coil pack. the problem persists. good and equivalent compression on all cylinde… read more
davehop
davehop
Diagnostic Technician
Ford Master Certified Technician
1,171 satisfied customers
2001 F-150: crew with the triton 5.4 and 85,000miles was T..rear door
My 2001 F-150 crew with the triton 5.4 and 85,000miles was T-boned in the pass. rear door/quarter panel area.The day after getting it back from the body shop, the motor started missing. A couple miles… read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
25,182 satisfied customers
i ahve 100,000 miles on 6 cyl. 4.0 engine. #4 plug misfires
I ahve 100,000 miles on 6 cyl. 4.0 engine. #4 plug misfires about every 10,000 miles, change plug and it's fine again. All new plug wires, O2 sensor, fuel filter, etc. When plug misfires, it does not … read more
FORDFXR
FORDFXR
MASTER TECHNICIAN
Vocational, Technical or Trade Scho
138 satisfied customers
F-250: v..rough idle..sputters..40 and 50 mph when accelerating
I have a 1999 for f-250 with a v-10 in it and it has a mild rough idle and sputters between 40 and 50 mph when accelerating. Had it scanned and it gave a po171 code. Any suggestions.… read more
Fordanswerman
Fordanswerman
Ford Senior Master Technician retired
Associate Degree
2,912 satisfied customers
2001 Ford mustang: 110,000 miles..accelerate..run fine..new plugs
I have a 2001 Ford mustang 3.8l V-6, it has approx 110,000 miles on it. I was driving to work this a.m., and it would start skipping when i would accelerate, but at a maintain speed it seem to run fin… read more
Vincent
Vincent
Automotive Technician
High School or GED
808 satisfied customers
1997 f-150: egr valve..solenoid..fuel filter changed, fuel pressure
I have 1997 f-150 4.6 new wires '' plugs ,egr valve , egr solenoid, new coil pack on passenger side, fuel filter changed, fuel pressure 31 psi, keeps fouling plugs on passenger side of engine . any id… read more
lostrider
lostrider
lead technician/working shop foreman
Vocational, Technical or Trade Scho
2,958 satisfied customers
ford f150: new got any answers on what to check next
I have a ford f150 and it is idlind rough.The plugs and wires are new got any answers on what to check next?… read more
FORDFXR
FORDFXR
MASTER TECHNICIAN
Vocational, Technical or Trade Scho
138 satisfied customers
explorer: 4.6L..Original plugs/wires/02 sensor. Running rough
2003 EB explorer 4.6L with 119K. Original plugs/wires/02 sensor. Running rough and engine light is on. Should I start with geeneral tune-up? And where are the plugs located and are the wires accessabl… read more
Fordster
Fordster
Mastertech
Vocational, Technical or Trade Scho
2,650 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