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 Pete Your Own Question

Pete
Pete, Auto Mechanic
Category: Chevy
Satisfied Customers: 15195
Experience:  14 years GM dealer Technician.
Type Your Chevy Question Here...
Pete is online now
A new question is answered every 9 seconds

1996 chevy: cylinder..misfire..I changed plugs,rotor,dis cap,and wires

Resolved Question:

I have a 1996 chevy c1500 with a 4.3 vortex. Number 1 cylinder has a misfire. I changed plugs,rotor,dis cap,and wires. Checked compression ok at 175,sprayed carb cleaner around intake at number 1 cylinder thinking blown gasket. all other cylinders ok. I have fire at no.1 It has a throttle body so I have fuel I think? Any help or a test I'm missing would be helpful. Thanks Randy
Submitted: 2 years ago.
Category: Chevy
Expert:  Pete replied 2 years ago.
Hello,I will be glad to try and assist you with this,Welcome to Just Answer.

Hi.

I just need a little more info to assist better.

Did you check compression on all other cylinders as well and if so what compression did you come up with?

Is this a constant misfire?

Let me know so we can continue,Thanks Pete!
Customer: replied 2 years ago.

Yes I did check the other cyl and all run pretty even. around 170. and yes It is a constant missfire at ant rpm

 

Expert:  Pete replied 2 years ago.
O.k.

Even though this vehicle has a throttle body this throttle body is used for air flow into the engine and this engine actually has a separate injector for each cylinder.These injectors are located under the upper plastic intake.The intake has to be removed in order to replace a faulty injector.

It sounds like you have covered everything else here that could be at fault and the problem is still present so the fuel injector sounds like the most likely component for the Number 1 cylinder.I have seen these restrict and stick closed causing this exact fault here.

To test this a fuel pressure test gage is needed as well as a scan tool to pulse the injector,each injector would need pulsed and the fuel pressure drop on the pressure gage observed for each injector as the pressure should drop some when each one is pulsed.

If the #1 injector doesn't drop any pressure at all or if it drops any different then 1.5 to 2 pounds in difference then the rest of the injectors then it is faulty and needs replaced.

Any shop or dealer would have the pressure test gage as well as the scan tool to pulse each injector.

The replacement is usually about $100 for the injector and about $30 for the upper intake gasket set and around 2 to 2.5 hours labor to have replaced.

The injectors are very common on these engines as well as GM's 5.0 and 5.7 liter engines as they all use the same injector design.

Let me know if you need anything else,click accept if you feel satisfied with your answer as this is how I get credited for my time,Thanks Pete!
Pete, Auto Mechanic
Category: Chevy
Satisfied Customers: 15195
Experience: 14 years GM dealer Technician.
Pete and 7 other Chevy 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:

 
 
 
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
< Last | Next >
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
  • 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
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Tim's Auto Repair

    mechanic

    Satisfied Customers:

    7641
    Have owned a repair shop for 25 yrs.
< Last | Next >
  • http://ww2.justanswer.com/uploads/TI/tim37857/2011-10-28_23053_S6301814.64x64.JPG Tim's Auto Repair's Avatar

    Tim's Auto Repair

    mechanic

    Satisfied Customers:

    7641
    Have owned a repair shop for 25 yrs.
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    Chevrolet Technician

    Satisfied Customers:

    6870
    ASE Master Certification. GM World Class Certification
  • http://ww2.justanswer.com/uploads/ggrote1/2009-06-27_031011_me.jpg Gary's Avatar

    Gary

    Chevy Technician

    Satisfied Customers:

    5404
    15 years GM master tech
  • http://ww2.justanswer.com/uploads/testedtuff/2009-09-26_170108_pictures.jpg John's Avatar

    John

    Master A.S.E Automotive technician

    Satisfied Customers:

    4071
    A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
  • http://ww2.justanswer.com/uploads/RO/rodcuda/2011-7-25_224114_Donhoff1.64x64.JPG Neal's Avatar

    Neal

    Chevy Mechanic

    Satisfied Customers:

    2306
    Shop Owner and Mechanic on multiple makes.
  • http://ww2.justanswer.com/uploads/goodwrench9124/2008-11-09_220838_dscf0007.jpg goodwrench9124's Avatar

    goodwrench9124

    ASE Certified Technician

    Satisfied Customers:

    2041
    Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer, Hybrid certified
  • http://ww2.justanswer.com/uploads/DR/drivefast1971/2012-1-12_172422_0009051tQKh.64x64.jpg Ron Z.'s Avatar

    Ron Z.

    - Chevy Tech -

    Satisfied Customers:

    1912
    18+yrs experience. State Inspector and Chevy Diagnostics