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 ASEMaster35yrs Your Own Question

ASEMaster35yrs
ASEMaster35yrs, Master Auto Tech
Category: Classic Car
Satisfied Customers: 2030
Experience:  Master Auto tech since 1972,I own a 65 mustang and have built a 57 ford race car from the bottom up
10832065
Type Your Classic Car Question Here...
ASEMaster35yrs is online now
A new question is answered every 9 seconds

Ford Mustang: 1970 mustang fastback (302) suddenly does not

Resolved Question:

1970 mustang fastback (302) suddenly does not idle and seems to run rough unless I rev it up. Was running fine then something changed.

Submitted: 1 year ago.
Category: Classic Car
Expert:  ASEMaster35yrs replied 1 year ago.

ASEMaster35yrs :

There are many possibilities. Start with checking with a tach/dwell meter and vacuum gauge. Check dwell & timing and check engine manifold vacuum. Check to see if the problem is within one particular cylinder by watching rpm as you pull one plug wire at a time to look for rpm drop. A good cylinder will drop rpm as you pull plug wire. Note the amount of rpm drop on each cylinder. If you find rpm stays the same or increases, the problem is in that cylinder. Pull spark plugs to look for any signs of problems. Check vacuum hoses for signs of cracks or splits. If you have an auromatic trans, check at vacuum modulator for signs of fluid. With a hand held vacuum pump, check distributor vacuum advance unit. The problem may be as simple as a fouled spark plug. Let me know what your dwell and vacuum reading is. What carburetor is on your vehicle?

ASEMaster35yrs :

I'm switching to Q&A format to be notified of your response.

ASEMaster35yrs, Master Auto Tech
Category: Classic Car
Satisfied Customers: 2030
Experience: Master Auto tech since 1972,I own a 65 mustang and have built a 57 ford race car from the bottom up
ASEMaster35yrs and 8 other Classic Car Specialists are ready to help you
Expert:  ASEMaster35yrs replied 1 year ago.
Our chat has ended, but you can still continue to ask me questions here until you are satisfied with your answer. Come back to this page to view our conversation and any other new information.

What happens now?

If you haven’t already done so, please rate your answer above. Or, you can reply to me using the box below.
Expert:  ASEMaster35yrs replied 1 year ago.

Your dwell should be 28 degrees and timing should be 6 degrees. Do a compression test to make sure there are no mechanical problems. Let me know what you find.

See this link for basic tune-up: http://1970mgr.org/_Tuneup.htm

302 specs

http://www.carmemories.com/cgi-bin/viewexperience.cgi?experience_id=232

 

http://www.tpocr.com/ford2.html

Expert:  ASEMaster35yrs replied 1 year ago.
Thank you for your positive feedback. Thank you for using just answer. Let me know if you need more help.

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
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
 
 
 

Meet The Experts:

 
 
 
  • Dr. Hamman

    Technician

    Satisfied Customers:

    2111
    I have 30 years experience repairing, restoring, and customizing cars, and pickup trucks.
< Last | Next >
  • http://ww2.justanswer.com/uploads/themaxview/2008-07-29_002441_me2.png Dr. Hamman's Avatar

    Dr. Hamman

    Technician

    Satisfied Customers:

    2111
    I have 30 years experience repairing, restoring, and customizing cars, and pickup trucks.
  • http://ww2.justanswer.com/uploads/DaleFStockst/2009-9-12_162517_Dale's__Smile.gif Dale Stockstill's Avatar

    Dale Stockstill

    Automotive Diagnostic Technician

    Satisfied Customers:

    1034
    40+ years as a technical expert, especially Corvettes.
  • http://ww2.justanswer.com/uploads/semloh1950/2010-04-04_112645_me.jpg Don's Avatar

    Don

    Classic Car Mechanic

    Satisfied Customers:

    939
    30 years of experience and we have 4 classic cars our selfs
  • http://ww2.justanswer.com/uploads/HE/heavychevy396/2012-3-23_215048_NascarMike500x500.64x64.jpg Mike S.'s Avatar

    Mike S.

    Classic Car Mechanic

    Satisfied Customers:

    728
    A.S.E. certified with 25+ years experience.
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    ASE Technician

    Satisfied Customers:

    379
    ASE Master Certification. GM World Class Certification
  • http://ww2.justanswer.com/uploads/roadsidejerry/2008-12-7_17344_jerry.gif Road Side Jerry's Avatar

    Road Side Jerry

    Auto Mechanic

    Satisfied Customers:

    280
    classic car mechanic
  • http://ww2.justanswer.com/uploads/Guest/2008-01-30_172341_image0.jpg RIP ROBERT's Avatar

    RIP ROBERT

    Classic Car Mechanic

    Satisfied Customers:

    246
    35 plus years GENERAL REPAIRS & ENGINE OVERHAULS
 
 
 

Related Classic Car Questions