How JustAnswer Works:

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

Ask autodoc_2000 Your Own Question

autodoc_2000
autodoc_2000, Auto Service Technician
Category: Car
Satisfied Customers: 2563
Experience:  ASE Master Tech w/ Advance Engine Performance
157591
Type Your Car Question Here...
autodoc_2000 is online now
A new question is answered every 9 seconds

i have a 98 lincoln town car with 4.6l engine. it will not

Resolved Question:

i have a 98 lincoln town car with 4.6l engine. it will not start all the time. just cranks and cranks. when it does start it runs fine. i am afraid to take it anywhere and shut it off. i took it to a local garage and the first thing he did was replace the fuel pump. it didn't solve the problem. i changed the fuel filter. still does it. then the fuel pressure regulator.still no help changed the relays still no help.he then said the pump had a bad ground added another ground no help then he ran a hot wire through the relay so it would be hot when you turned the key.you guessed no help. i cleaned the battery terminals which were not that bad but that why not no help. i can hear the pump running but it still just cranks the car has 41000 low iles for year i don't think the first pump was bad but do not know what else to try. the first time i was there he did check it with a fuel pressure gauge. and it wasn't getting enough pressure that's why we started with the pump. any ideas?
Submitted: 5 years ago.
Category: Car
Expert:  autodoc_2000 replied 5 years ago.
Has your mechanic verified that there was no fuel pressure when the vehicle is acting up? If not this would be the first step. You could be loosing spark or injector pulse which would also cause a no start condition. If indeed the fuel pump is not running at the time of the no start then you will need to use a teat light to see where the power and/or ground is being lost at. You could have fuel pressure and still not have it start due to the fuel injectors not opening.
Customer: replied 5 years ago.
the first time there was low pressure. that's why we changed the pump no we have it wired so ti runs as soon as you turn the key there should be pressure but i cant say for sure. how can i tell if it's the injector's not opening
Expert:  autodoc_2000 replied 5 years ago.

There is a tool called a noid light. You remove the plug from the injector and plug this into the connector. Try to start it and see if the light flashes. If it is then the computer is commanding it to pulse. If it is not flashing then the computer is not commanding it. Check out this link.

 

http://www.noidlight.com/fuel-injectors-and-noid-light/

Customer: replied 5 years ago.
ok one last question then i'll pay you fuel pump is running in the no start i used the noid light and there was no light then i went to another injector and nothing during the first crank and on the second crank it started flashing and the car started so do i need a computer since it is not telling it to fire all the time or could it be something else thank you for your help doc i am gratefull walk
Expert:  autodoc_2000 replied 5 years ago.
The computer is the most likely problem. The camshaft position sensor is what the computer uses to synchronize the injectors, but wont prevent them from firing. If the crankshaft position sensor goes bad the injectors wont fire, but also there iwll be no spark. If you have power to one side of the injector then I would say more than likley the computer. If you dont have power when the injector is not firing then you more than likely have a wiring issue.
autodoc_2000, Auto Service Technician
Category: Car
Satisfied Customers: 2563
Experience: ASE Master Tech w/ Advance Engine Performance
autodoc_2000 and 19 other Car Specialists are ready to help you

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 P Elm City, NC
< Last | Next >
  • 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 P Elm 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. Phil Marysville, 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. Charles Walnut 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!
    Sue Charleston, 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. Jim Castleberry, FL
  • Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV. Dutch USA
 
 
 

Meet The Experts:

 
 
 
  • Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka-Moose)'s Avatar

    Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
  • http://ww2.justanswer.com/uploads/TE/TedG/2012-6-15_14759_avaLarge.64x64.jpg Ted G.'s Avatar

    Ted G.

    ASE Certified Technician

    Satisfied Customers:

    1596
    20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    1311
    ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist
  • http://ww2.justanswer.com/uploads/AM/amedee/2013-10-24_23656_Amedee1.64x64.jpg Amedee's Avatar

    Amedee

    ASE Master Tech

    Satisfied Customers:

    2367
    ASE Master Tech advanced level specialist
  • http://ww2.justanswer.com/uploads/SU/supermechanic/2013-8-23_03546_500.64x64.jpg Jerry's Avatar

    Jerry

    Master Mechanic

    Satisfied Customers:

    1906
    ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    942
    12 years Ford Lincoln/Mercury Jaguar dealership as a technician and shop foreman reparing all makes
  • http://ww2.justanswer.com/uploads/ST/Steve7654/2012-6-5_215929_japic800x660.64x64.jpg Steve's Avatar

    Steve

    Auto Service Technician

    Satisfied Customers:

    1980
    25+ yrs experience as a professional working technician; ASE L1 master technician