Car

Ask a Mechanic Online and Get Answers to Your Car Questions

Ask an Expert,
Get an Answer ASAP!

Car
This answer was rated:

engine is skiping and back firing and wont stay running

engine is skiping and back firing and wont stay running
Ask Your Own Car Question
Answered in 29 minutes by:
8/3/2013
Matt
Matt, Engineer
Category: Car
Satisfied Customers: 22,438
Experience: Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.
Verified
Hi

can you tell me what make, model engine size and how many miles are on the car?
Ask Your Own Car Question
Customer reply replied 4 years ago

1992 F150 5.0 with 138,00 miles

Hello

This could be a lack of fuel pressure from the electrical pump at the tank.

If the connections to this are corroded or damaged then the pump could stop at any time or could not be running at full speed. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse,
Ideally measure the pressure at the injectors and if this is low check the pump as described and also consider changing the fuel filter as if this partially blocked this too will reduce pressure.
Matt
Matt, Engineer
Category: Car
Satisfied Customers: 22,438
Experience: Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.
Verified
Matt and 87 other Car Specialists are ready to help you
Ask your own question now
Ask Matt Your Own Question
Matt
Matt
Matt, Engineer
Category: Car
Satisfied Customers: 22,438
22,438 Satisfied Customers
Experience: Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.

Matt 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:

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

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

The nearest Volvo dealer is 160 miles away. Best $15 bucks I have spent in a long time!

Paul MCorpus Christi, TX

< Previous | Next >

Meet the Experts:

Chris (aka-Moose)

Chris (aka-Moose)

Technician

1,243 satisfied customers

16 years of experience

Ted G.

Ted G.

ASE Certified Technician

1,724 satisfied customers

20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness

George H.

George H.

ASE Certified Technician

1,537 satisfied customers

ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist

GM Tech (Cam)

GM Tech (Cam)

Auto Service Tech

669 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Amedee

Amedee

Former ASE Master Tech

2,520 satisfied customers

ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector

Jerry

Jerry

Master Mechanic

2,181 satisfied customers

ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager

Richard

Richard

ASE Certified Technician

1,000 satisfied customers

12 years Ford Lincoln/Mercury Jaguar dealership as a technician and shop foreman reparing all makes

< Previous | Next >

Related Car Questions
I was in a minor accident that caused my ECU fuse under the
I was in a minor accident that caused my ECU fuse under the hood to blow . I replaced the fuse but car still doesnt start. … read more
Dan
Dan
Dealership Technician
Associate Degree
1,770 satisfied customers
Abs vsc vsc trac and check engine light cam on. Blinks. 2007
abs vsc vsc trac and check engine light cam on JA: Does the light stay on, or does it blink? Customer: blinks JA: What is the model/year of your Toyota? Customer: 2007 fj JA: Are you fixing your vehic… read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
I have a Toyota Corolla and the low tire pressure light
I have a Toyota Corolla and the low tire pressure light keeps going on even after making sure the tire pressure is correct and resetting the light. The Toyota dealership said some spare tires are atta… read more
ggrote1
ggrote1
Vocational, Technical or Trade Scho
13 satisfied customers
06 Tacoma is most of the time very hard to get into first
06 Tacoma is most of the time very hard to get into first gear and sometimes second....Are there any common problems for this truck that causes that condition?… read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
I need an unlock code for a Dodge/Chrysler RA4 Radio. Radio
I need an unlock code for a Dodge/Chrysler RA4 Radio … read more
Peter Bagley
Peter Bagley
master technition
Vocational, Technical or Trade School
1,008 satisfied customers
2013 2500hd 6.0 74000 miles. Pulling camper in tow mode at
2013 2500hd 6.0 74000 miles. Pulling camper in tow mode at 70 mph with Cruse on, suddenly heard beeps, engine redlined, and trans temp shot to 265 degrees. Then every light on dash came on, engine wen… read more
BOBBYSS
BOBBYSS
TECHNICIAN/ADVISOR
Associate Degree
8,343 satisfied customers
Trans.w. Shifted hard and now want move either way. 2004 the
I'm trying to figure that out just seen under truck and there some wet. No lines or hoses leaking … read more
ggrote1
ggrote1
Vocational, Technical or Trade Scho
13 satisfied customers
I have a 2003 Toyota Tacoma the headlights work on high beam
I have a 2003 Toyota Tacoma the headlights work on high beam only. No low beam. I have checked the fuses and the bulbs do not show any broken filaments. What else should I check? … read more
jim
jim
Vocational, Technical or Trade Scho
702 satisfied customers
My 2014 Toyota Pruis V trunk has become very difficult to
My 2014 Toyota Pruis V trunk has become very difficult to close without really slamming it. This is kind of a new problem. Any suggestions as to how I can fix it would be greatly appreciated. … read more
vwtech0405
vwtech0405
VW Technician
Associate Degree
8,868 satisfied customers
Have been away for 5 weeks, appears to have a flat battery
have been away for 5 weeks, appears to have a flat battery despite the car being started in tis time. how do I recharge the battery safely … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
4,375 satisfied customers
I am looking for car deals with average paying 150-200 /
I am looking for car deals with average paying 150-200 / month ? Is there ay. Current deal around me here in NY… read more
roy
roy
Associate Degree
3 satisfied customers
Start engine and car shakes, check engine light on but then
Start engine and car shakes, check engine light on but then goes off, rpm fluctuate. Is idle control valve? … read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
I have a 2002 Bentley Arnage T took it to a car audio shop
I have a 2002 Bentley Arnage T took it to a car audio shop and no one knows how to remove the broken audio unit in the dash. stuck … read more
Eurocar Inc
Eurocar Inc
Master Audi/VW Tech
Associate Degree
1,773 satisfied customers
I have a V70 Mk 1 and I have always been able to read codes
Hello, I have a V70 Mk 1 and I have always been able to read codes with an autel MD702 scanner all of a sudden it is unable to communicate with th ECU and an engine light is on … read more
sprinkles08
sprinkles08
Technician
High School or GED
11 satisfied customers
Battery in my 2007 lexus gs350 was disconnected and now I
Hello, battery in my 2007 lexus gs350 was disconnected and now I have a problem with ac controller unit. navigation map display and radio works but all buttons around are dead and no response. all fus… read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
My lexus is lx470, is 2006, It is not a car of a customer I
It is not a car of a customer I have problems with the suspension system, I start high but when it starts to roll low … read more
sprinkles08
sprinkles08
Technician
High School or GED
11 satisfied customers
Where can I locate a throttle cable for my 92 festiva manual
Where can I locate a throttle cable for my 92 festiva manual L 1.3 L … read more
sprinkles08
sprinkles08
Technician
High School or GED
11 satisfied customers
Need to know what is the best type and weight oil and how
Need to know what is the best type and weight oil and how many quarts are needed … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 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