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 karrs2fix Your Own Question

karrs2fix
karrs2fix, ASE Certified Technician
Category: Ford
Satisfied Customers: 818
Experience:  ase master technician,L1 certified, Iatn sponser, tech net training
Type Your Ford Question Here...
karrs2fix is online now
A new question is answered every 9 seconds

99 ford ranger: 4.0 changed fuel injector..it knocks real bad

Customer Question

99 ford ranger 4.0 changed fuel injector now when i start it it knocks real bad.
Submitted: 2 years ago.
Category: Ford
Expert:  karrs2fix replied 2 years ago.
When you replaced the injector did fuel spill down through the injector hole into the cylinder? If so you could try to remove that cylinder spark plug, DISSABLE the ignition system and crank the engine to allow excessive fuel to be pushed out of the cylinder through the spark plug hole.
karrs2fix, ASE Certified Technician
Category: Ford
Satisfied Customers: 818
Experience: ase master technician,L1 certified, Iatn sponser, tech net training
karrs2fix and other Ford Specialists are ready to help you
Customer: replied 2 years ago.
thanks. now the knock comes and goes. any other ideas.
Expert:  karrs2fix replied 2 years ago.
You can try to narrow the noise down to a specific cylinder by disabling spark to the cylinders one at a time. From there it could be a few different things rod bearing , wrist pin at the piston. I am not sure why you had to replace the other injector but if you have some other injection problems and some misfiring you could be getting to much fuel into the cylinders contributing to the noise.
Customer: replied 2 years ago.
There was a dead miss at no 1 cyl. Good compression, good pulse with noid tester.. We even powered up the injector while it was unplugged. It would click but it wasn't spraying fuel. We had already changed the spark plugs. No 1 was firing fine. So we decided to change no. 1 injector. It did not have a noise in that motor before we changed the plugs. No tap and no knock. It sounds more toward firewall. We pulled all the plugs out again. One at a time like you said. we pushed out all raw gas. Wasn't much. Now like I said the knock comes and goes but it's a lot better than it was. The oil is thin. We are going to change the oil in the morning and let you know what we got. Do you suggest any oil additive? Lucas or? Thanks. Chuck Varner
Expert:  karrs2fix replied 2 years ago.
Lucas is a good additive, we use BG products most of the time Moa for a lower mileage cleaning additive and RF7 for higher mileage engines. You can try to pinpoint the noise to a specific cylinder if it is still present after the oil change. Leaving all plugs in run the engine and remove one spark plug wire or unplug fuel injector one at a time to try to pinpoint individual cylinders, that will stop the firing event in that cylinder .

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.