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 Brad Your Own Question

Brad
Brad, ASE Certified Technician
Category: Ford
Satisfied Customers: 2365
Experience:  ASE Certified Master Technician
5135651
Type Your Ford Question Here...
Brad is online now
A new question is answered every 9 seconds

1995 f150: loses power like it is running out of gas

Customer Question

my 1995 f150 loses power like it is running out of gas . had it at 3 places and is still not fixed. put on computer all 3 times .the check engin light comes on . the oxygen cencer was replaced 3 times, then it will be ok four about a week then it starts all over again. it dosent seam to have all its power when it does run for that week. please help,i am going broketrying to get this fixed!! it is a 5.0L,auto.4by4
Submitted: 4 years ago.
Category: Ford
Expert:  jim replied 4 years ago.

We have seen this problem many times. The following needs to be checked.

 

Get a volt meter on the O2 signal wire and see if the meter agrees with the DATA.

If the O2 signal circuit has 1.13 V on it, try unplugging the O2 sensor from the harness and see if the voltage on DATA drops to 0.0 V.

If the voltage changes, check the O2 harness connector for corrosion.

Clean or replace the connector as needed.

Customer: replied 4 years ago.
Relist: did every thing that jim told me to do before he told me to do that.it did not work then so it can not be that. could it be the cat????.
did every thing that jim told me to do before he told me to do that.it did not work then so it can not be that. could it be the cat????
Expert:  Brad replied 4 years ago.
Lots of things can cause your issues... MAP sensor, Throttle Position Sensor, bad computer..

You mentioned your engine light was on.. do you happen to know what codes were set?

Edited by Brad on 8/24/2010 at 4:15 AM EST
Customer: replied 4 years ago.
but what is causing the o2 sensor to go bad? after i replace the o2 sensor it is ok for about a week then something is making it go bad again. this is my third o2 sensor.
Expert:  Brad replied 4 years ago.
It depends... how are you positive the O2 sensors are bad? Are the bad electrically, or are they bad physically?

Does your truck smoke out of the tailpipe any? Oil or Coolant in the exhaust can kill an O2 sensor real quick.
Customer: replied 4 years ago.
brad,we checked allof that also. no water or oil!! oil is ok and dosent burn oil. never haft to add oil from one oil change to the other. same with the collant. i am not shure the o2 sensors are bad ,but as soon as i put a new one in its ok for about a week to 10 days, then it starts all over again
Expert:  Brad replied 4 years ago.
OK.. before I can even begin to help further, I'm going to need to know what codes are stored in the computer.

As for the O2 sensors.. I would unplug them and double check the terminals at the connector.. make sure none are pushed back.. or bent.. or corroded.. etc. Also, if you've been splicing in 'universal' sensors, then you need to make sure you're splicing into the correct wires, and that you are SOLDERING them together and using shrink wrap to properly seal the splices so they don't get contaminated with moisture.

You also need to physically inspect as much of the wiring as you can, to make sure none of it is laying against the exhaust somewhere and melting... or coming apart.. or whatever.

O2 sensors can also get contaminated and fail if the engine is allowed to run rich. It's possible you have another problem going on (such as a ruptured fuel pressure regulator.. injector sticking.. low compression..ignition problem, etc) that is allowing unburned fuel into the exhaust, and after awhile the O2 sensors get so saturated with it that they can no longer function correctly. They will usually clean themselves up once the engine stops running rich... but it's still possible that something else entirely is causing your O2 sensors to fail.

You mentioned that even with it's 'fixed' it still doesn't seem to have full power... that sounds like it's not running on all 8 cylinders... I would suggest that you chase the misfire before continuing.

You can also try removing the O2 sensors and drive it around the block. Yes it will be VERY LOUD but if you notice that the power has been restored, then there's a good chance that the catalytic converters are all plugged up (and you have power now because the holes opened with the O2 sensors being out allow it to breathe).

So you see there are still many possibilities here.. I feel the O2 issues is a result... not a cause.. of your problems.
Customer: replied 4 years ago.
brad, i agree that the o2 sensor isnot the cause. the only thing wrong with unplugging the o2 sensor is it will run great one minute and then start acting up the next minute. it does not run bad all the time . it comes and goes. i realy appreciatetour help!see if u can come up with something else?then i will pay u... thanks
Customer: replied 4 years ago.
brad, this truck only has one o2 sensor. this is all factory.does that mean any thing?
Expert:  Brad replied 4 years ago.
No it doesn't change anything.. you need to chase down why the truck is running rough, even with a new O2 sensor. This is probably what keeps causing them to fail.

You need to start back at the basics... check for fuel pressure, spark, compression. If you have one cylinder that has a significantly less amount of compression than the others (more than 10% less), then that cylinder isn't burning all of its fuel and pushing it into the exhaust, which can cause the O2 sensor to start failing.
Brad, ASE Certified Technician
Category: Ford
Satisfied Customers: 2365
Experience: ASE Certified Master Technician
Brad and 8 other Ford 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:

 
 
 
  • 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.
 
 
 

Related Ford Questions

Chat Now With A Ford Mechanic
Brad
Brad
Lead Diagnostic Technician
878 Satisfied Customers
ASE Certified Master Technician