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 MikeB85 Your Own Question

MikeB85
MikeB85, ASE Certified Technician
Category: Ford
Satisfied Customers: 354
Experience:  ASE Certified, I-Car Trained and Certified, Automotive Technology Degree
7731073
Type Your Ford Question Here...
MikeB85 is online now
A new question is answered every 9 seconds

1992 Ford F-150: Idles rough then smooth then rough

Customer Question

1992 Ford F-150 4.9 standard. Idles rough then smooth then rough. No power. At times will pick up and go then back to rough. What is causing this problem
Submitted: 6 years ago.
Category: Ford
Expert:  MikeB85 replied 6 years ago.

Your vehicle is equipped with an idle control system that is controlled through the ecm. If there is a fault in the system it should throw a trouble code. It is possible that you have an issue with the Idle Speed Control solenoid. You can test the solenoid using a digital multimeter that can measure resistance. Disconnect the the harness connector from the solenoid. Set the multimeter to the 200-Ohm scale. Now measure the resistance between the connector terminals. (I have a picture below to help you out.) There is a diode in the solenoid. Connect the multimeter positive test lead to the VPWR terminal and the multimeter negative lead to the ISC terminal. The resistance should be 7-13 ohms. If the resistance doesn't fall in this range then replace the Idle Speed Control Solenoid. I priced this item on Auto Zones website and it lists for around $50. Let me know if you have any other questions. Thanks.

graphic

Customer: replied 6 years ago.
Reply to MikeB85's Post: I'm asking for my next door neighbor. (no computer. living in the dark ages) Will check with him in AM. Thank you
Expert:  MikeB85 replied 6 years ago.
Not a problem. Let me know what he comes up with. Thanks.
Customer: replied 6 years ago.
Hi Mike neighbor states he's replaced EGR valve, Idle position, throttle sensor, plugs/wiring, rotator, distributer cap and control module.
He says its like no fuel or fire. Then picks up and runs then drops down. Misses. No power.
He asks could it be clogged catalytic converter? That is his inclination.
Expert:  MikeB85 replied 6 years ago.
You can try checking the catalytic converter by hitting or shaking it to listen for any loose parts that may cause it to clog up and restrict the exhaust flow. This will cause loss of power and driveability problems. Although I still believe it could be an issue with the idle system. I would still do the test that I have listed above just to double check. This could also be caused by a possible short or open in the circuit for the idle speed control solenoid. This is what he replaced? Let me know if you have any questions.

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 D USA
< Last | 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
 
 
 

Meet The Experts:

 
 
 
  • Ron

    ASE Certified Technician

    Satisfied Customers:

    20942
    23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
< Last | Next >
  • http://ww2.justanswer.com/uploads/FO/fordguy4u/2011-12-17_222940_HPIM1257.64x64.JPG Ron's Avatar

    Ron

    ASE Certified Technician

    Satisfied Customers:

    20942
    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)

    Ford Technician

    Satisfied Customers:

    22382
    16 years experience with Ford.
  • http://ww2.justanswer.com/uploads/JM/jmcdo28/2012-2-23_01655_resized.64x64.jpg John Mc's Avatar

    John Mc

    Ford Technician

    Satisfied Customers:

    5493
    19 years Ford Lincoln Mercury experience
  • http://ww2.justanswer.com/uploads/wmarti7/2009-4-18_04332_Avatar.jpg Chuck's Avatar

    Chuck

    ASE Certified Technician

    Satisfied Customers:

    1684
    33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    1518
    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:

    789
    25 years experience on all makes and models, Licensed NYS Inspector.
  • http://ww2.justanswer.com/uploads/lostrider/2009-9-26_23144_php4VNWAA_c1PM1.jpg lostrider's Avatar

    lostrider

    Ford Technician

    Satisfied Customers:

    2940
    ASE Master Technician, Ford Senior Master Technician,Diesel certified, ASE Master, 22 yrs FORD exp.