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 Amedee Your Own Question

Amedee
Amedee, ASE Master Tech
Category: Car
Satisfied Customers: 21981
Experience:  ASE Master Tech advanced level specialist. Wisconsin certified emissions state inspector
279429
Type Your Car Question Here...
Amedee is online now
A new question is answered every 9 seconds

Isuzu: cab..driven..gas before I parked it) It idles..acceleration

Customer Question

I have a 1991 2.6 fuel injected Isuzu pick up (space cab). Haven't driven it in over a year (I did drain the gas before I parked it) It idles well enough, but when I take it out on the road it has no acceleration. If feels like I am getting plenty of gas but no air. I also have spark. The check engine light only rarely flashes briefly and when I ran the codes I got 12 and 61. I changed the Oxygen sensor and the mass air flow sensor with no change in performance. I checked the wires from the MAF to the computer to see if it was connected and all looks well. I took out the computer to see if I could see any damage there and it looks brand new (no dust). The throttle valves open when I press the accerator, the Vacuum valve switching assembly seems fine, because I tested it by disconnecting it and when I did it gave me a code 25. Im at a complete loss. The exhaust has several rusted holes in it. Would lack of back pressure throw a code 61? If not what else can?
Submitted: 2 years ago.
Category: Car
Expert:  Auto Psychic replied 2 years ago.

Auto Psychic :

sorry to hear of your misfortune :(

Auto Psychic :

sounds like either a plugged fuel filter or plugged catalytic converter.

Auto Psychic :

does running it with the air cleaner removed help at all?

Customer:

I changed the fuel filter and I cut off the cat in order to get the right pipe size to reinstall it. I basically have no exhaust at the moment.

Auto Psychic :

well its official you've stumped the auto psychic lol

Auto Psychic :

relistling your question now so one our smarter experts can help.

Auto Psychic :

good luck, gary

Customer:

I've had a cat go out before on a bonneville with similar symptoms. But when the cat went out on the Bonneville I couldn't get over 15 mph. I can get the Isuzu occasionally up to 60 but only by barely holding down the accelerator and lightly tapping it. If I push down on it and give it the gas it will only bog down.

Customer:

I should mention when I was driving it I had the cat on it, but the muffler was rusted through (basically no muffler). Like I said I haven't driven it in over a year. I'm trying to get it road worthy and put a new exhaust system on it. I should also mention that on Monday it completely died. Couldn't start it Monday or Tuesday which is the day I took out the computer. I put the computer back in tonight when I got home from work and I had nothing. No lights (computer lights check engine, seat belt, door chime no gauges, nothing. I gave up and threw in the towel since I put the computer back in EXACTLY the way I took it out. Was extremely gentle with it. But then a friend called tonight and asked how the truck was going. and I told him it was dead. But I went back out and tried one more time to turn it over and the computer fired up and the truck started. Came back to life like the terminator, although the no air problem hasn't changed. And code 61 still comes up when I run the codes. I

Customer: replied 2 years ago.
Relist: Other.
I posted my question and Auto Psychic said he was stumped and would relist it. I got an email from TED-380676 who says he has an answer, but I don't see it on here.
Expert:  Amedee replied 2 years ago.
Hello!

New Expert here!

Did you still need help?

Can you get the vehicle to act up so we can run a few tests?
Customer: replied 2 years ago.
Yeah, its running but with the same problem, not enough air. The only code it throws is 61. I'm at work right now, but would love to hear any ideas you might have, when I get off this evening.
Expert:  Amedee replied 2 years ago.
When you have some time, I will need to know what the o2 sensor voltage is at under a load when this problem happens.

Let me know!
Customer: replied 2 years ago.
How am I going to get that? I also put in a known faulty O2 sensor and it threw a code 13 I believe. I since put the new one back in and no longer get that code. I know its getting gas because I can hear the crackle of vapors igniting in the exhaust. And when I had it out on the road and managed to get it to 60 with a struggle it would purr beautifully (relatively speaking for its age a little lifter noise) as long as I didn't try to accelerate, once I did that I would lose power and speed if I decelerated I would get the pop pop pop in the exhaust.
Expert:  Amedee replied 2 years ago.
Hello! You will have to hook up a voltmeter to the o2 sensor voltage wire and take a reading while this problem is happening. You can get it to act up by doing a brake stand and getting a volt reading then or by running a wire from the o2 sensor to the voltmeter inside the vehicle while you take it for a test drive and get it to act up
Amedee, ASE Master Tech
Category: Car
Satisfied Customers: 21981
Experience: ASE Master Tech advanced level specialist. Wisconsin certified emissions state inspector
Amedee and other Car Specialists are ready to help you
Expert:  Amedee replied 2 years ago.
Hello!

It looks like this question says waiting for Expert reply? I am not sure why but I just wanted to see if you have any further questions. If not, let me know the readings when you get a chance.

AMEDEE
Customer: replied 2 years ago.
It was a bad O2 connector. Still sluggish though, but it will accelerate slowly. I think that might be another issue. You set me on the right track. I think I can figure out the rest. I really appreciate your help. About to leave cell phone coverage. Will try to write more on Sunday. Have a great weekend.
Expert:  Amedee replied 2 years ago.
Thanks for honoring your good faith deposit by accepting my answer.

Please let me know if you have any further questions!
Customer: replied 2 years ago.
The O2 sensor didn't work. I put in another one. Proper torque, ran a little better for about 30 miles, then back to the same thing (it was alweays the same thing, just a little better). I didn't have the O2 tight enough when we started and once I got it tight the code 61 went away. Now I have no codes. So what you did suggest helped, but now I'm getting 50 miles half a tank. Went from 11 mpg to about 6 mpg. Thinking it might be a bad fuel pressure regulator. I ordered a new one and should be in today. Let you know how it works.
Expert:  Amedee replied 2 years ago.
Sounds good!
Customer: replied 2 years ago.
That didn't work either. I tell ya, I get the hard problems. Next option is timings off or leaky injectors.

Truck has 270K miles on it, I got it at 186K in 05 but driven it since 03. Bought it from the company I use to work for. I know in 95 it had 135K and in 03 it had 165K. I ASSUME someone working for the company blew the engine and then let it set for 7 years before they decided to get it fixed (possibly a rebuilt engine) and ship it to our office. Why else would it have 30K miles in 7 years? Also I think most of those were put on in 02? Since I've owned it I've only had the spindle fixed, timing belt replaced, fuel pump and a main pulley fixed in 100K miles. So I can't say it hasn't been a good truck. Not opposed to rebuilding it and putting money into it. Just wish I knew what the problem was. Although if the fuel injectors ar 21 years old they might need to be replaced (regardless if it fixes the problem or not)..
Expert:  Amedee replied 2 years ago.
You will have to check the ignition timing by pulling the front cover.

You can also see if the injectors are leaking fuel by checking fuel pressure. If it leaks down after the engine is turned off, this could be an indication of leaky injectors.

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
  • Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV. Dutch USA
 
 
 

Meet The Experts:

 
 
 
  • Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka-Moose)'s Avatar

    Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
  • http://ww2.justanswer.com/uploads/TE/TedG/2012-6-15_14759_avaLarge.64x64.jpg Ted G.'s Avatar

    Ted G.

    ASE Certified Technician

    Satisfied Customers:

    1596
    20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    1311
    ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist
  • http://ww2.justanswer.com/uploads/AM/amedee/2013-10-24_23656_Amedee1.64x64.jpg Amedee's Avatar

    Amedee

    ASE Master Tech

    Satisfied Customers:

    2367
    ASE Master Tech advanced level specialist
  • http://ww2.justanswer.com/uploads/SU/supermechanic/2013-8-23_03546_500.64x64.jpg Jerry's Avatar

    Jerry

    Master Mechanic

    Satisfied Customers:

    1906
    ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    942
    12 years Ford Lincoln/Mercury Jaguar dealership as a technician and shop foreman reparing all makes
  • http://ww2.justanswer.com/uploads/ST/Steve7654/2012-6-5_215929_japic800x660.64x64.jpg Steve's Avatar

    Steve

    Auto Service Technician

    Satisfied Customers:

    1980
    25+ yrs experience as a professional working technician; ASE L1 master technician
 
 
 
Chat Now With An Auto Mechanic
Amedee
Amedee
Service Manager
2381 Satisfied Customers
ASE Master Tech advanced level specialist. Wisconsin certified emissions state inspector