A new question is answered every 9 seconds

1994 ford ranger: wont start..replaced the fuel pump and fuel filter.

Customer Question

I have a 1994 ford ranger that won't won't start when hot. Does fine when its cold. replaced the fuel pump and fuel filter.
could my starter be going out?
Replace spark plugs and wires. but since I did that it now is cutting out. i check gap twice.

This morning it didn't start when the engine was cold for the first time.
Submitted: 6 years ago.
Category: Ford
Expert:  Tim West replied 6 years ago.
Thanks for visiting Just Answer,
Is there a check engine light on?
When the problem is and isn't present compare spark from the wires. Using the engine as a ground check for spark to jump from the end of the wire to the ground. Compare to when the problem is present and not present. See if there is a noticabl difference in spark.
If spark is weak, you could have a bad coil. Also what kind of plugs did you use?

NExt, do you have access to a fuel pressure gauge? If possible check the fuel pressure and verify fuel pressure holds. 30-45psi is specification. Verify the fuel pressure isn't high or does not bleed off. This is important. If fuel pressure is too high, replace the fuel pressure reuglator for letting too much gas go to the injectors. This can cause a hard start. Also, if fuel pressure does not hold pressure, the regulator could be bad. You can also remove the return line from the fuel pressure regulator and smell for raw fuel.

If ok, let's move on to the PCM and some possible sensor issues.

First, unplug the mass air flow sensor and see if the problem goes away. The mass air flow sensor is the one located on the hose coming from the air filter box.
If no change, plug back it.

Next the coolant temp sensor, the coolant temp sensor and Mass air flow sensors both can affect how much fuel the pcm thinks the vehicle needs, so both can cause a rich condition. graphic

(Ohms) Max.
(Ohms) Temp F Temp C
31700 42900 68 20
13650 18650 104 40
6500 8900 140 60
3240 4440 176 80
1770 2370 212 100
980 1380 248 115
Customer: replied 6 years ago.
No check engine light on. I use motorcraft spark plugs And new wires but only after it started having problems.
fuel pressure on old pump i replace was 20.
I have already unplug the mass air flow sensor there was no change
I will check the fuel pressure reuglator like you said
and I will check the coolant temp sensor,
thank you
Expert:  Tim West replied 6 years ago.
Thanks, XXXXX XXXXX to me let me know how it goes. Thank you.
Customer: replied 6 years ago.
I replace the ingintion coil both of them
and the fuel pressure regulator
the fuel pump the fuel fiiter
the spark plugs and wire.
and the coolant temp sensor.
it still won't start hot or cold.
it trys to start but won't
is there anything else i should replace?
Ask Tim West Your Own Question
Tim West
Tim West, ASE Certified Technician
Category: Ford
Satisfied Customers: 4638
Experience:  ASE Certified Service manager of Firestone
Type Your Ford Question Here...
Tim West is online now
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.

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 D USA
< Previous | Next >
  • 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 D USA
  • 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. Molly USA
  • 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. BR New 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 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

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.

Meet The Experts:

  • Ron


    ASE Certified Technician

    Satisfied Customers:

    23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
< Last | Next >
  • http://ww2.justanswer.com/uploads/FO/fordguyu/2015-7-7_172556_onnieew.64x64.jpg Ron's Avatar


    ASE Certified Technician

    Satisfied Customers:

    23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka- Moose)'s Avatar

    Chris (aka- Moose)


    Satisfied Customers:

    16 years experience
  • http://ww2.justanswer.com/uploads/JM/jmcdo28/2012-2-23_01655_resized.64x64.jpg John Mc's Avatar

    John Mc

    Ford Technician

    Satisfied Customers:

    19 years Ford Lincoln Mercury experience
  • http://ww2.justanswer.com/uploads/wmarti7/2009-4-18_04332_Avatar.jpg Chuck's Avatar


    ASE Certified Technician

    Satisfied Customers:

    33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance
  • http://ww2.justanswer.com/uploads/BL/Bluegorilla/2012-6-21_16298_cam.64x64.JPG Cam's Avatar


    Journeyman Automotive Technician

    Satisfied Customers:

    GM Grand Master Technician 2007. 14 years Automotive experience.
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar


    ASE Certified Technician

    Satisfied Customers:

    12 years at a Ford Lincoln/Mercury and Jaguar dealer as a technician and shop foreman.
  • http://ww2.justanswer.com/uploads/BA/baddad1/2014-4-1_23659_avatar.64x64.jpg Mike V.'s Avatar

    Mike V.

    Auto Service Technician

    Satisfied Customers:

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