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 Dan Your Own Question

Dan
Dan, Auto Technician
Category: Chevy
Satisfied Customers: 3490
Experience:  GM Mark of Excellence/ Service Guild Participant with 13 years experience, ASE Master Certified
Type Your Chevy Question Here...
Dan is online now
A new question is answered every 9 seconds

How to replace knock sensor on 2004 Chevy Tahoe 5.3

Resolved Question:

How to replace knock sensor on 2004 Chevy Tahoe 5.3
Submitted: 5 years ago.
Category: Chevy
Expert:  Dan replied 5 years ago.
Intake Manifold Replacement

Removal Procedure

    Important: The intake manifold, throttle body, fuel rail, and injectors may be removed as an assembly. If not servicing the individual components, remove the manifold as a complete assembly.

  1. Remove the throttle body. Refer to Throttle Body Assembly Replacement .
  2. Remove the fuel injectors. Refer to Fuel Injector Replacement .
    Object Number: 679510  Size: SH

  3. Disconnect the following electrical connectors:
    Manifold absolute pressure (MAP) sensor (1)
    Knock sensor (2)
  4. Remove the knock sensor harness electrical connector from the intake manifold.
  5. Set the electrical harness aside.
    Object Number:(NNN) NNN-NNNN Size: SH
  6. If equipped with vacuum assisted brakes, remove the vacuum brake booster hose from the rear of the intake manifold.
    Object Number:(NNN) NNN-NNNN Size: SH

  7. Remove the positive crankcase ventilation (PCV) hose.
    Object Number:(NNN) NNN-NNNN Size: SH

  8. Remove the MAP sensor (1) from the intake manifold.
    Object Number:(NNN) NNN-NNNN Size: SH

  9. Remove the evaporative emission (EVAP) purge solenoid vent tube by performing the following:
    9.1. Remove the EVAP tube end from the solenoid (1).
    9.2. Remove the EVAP tube end from the vapor pipe (2).

    Object Number: 389993  Size: SH

  10. Remove the EVAP purge solenoid bolt (2), solenoid (3), and isolator (1) from the intake manifold.
    Object Number:(NNN) NNN-NNNN Size: SH

  11. Loosen the intake manifold bolts.
  12. Remove the intake manifold.
    Object Number: 492770  Size: SH
  13. Remove the intake manifold gaskets (1) from the intake manifold.
  14. Discard the old intake manifold gaskets.
  15. If required, clean and inspect the intake manifold. Refer to Intake Manifold Cleaning and Inspection .

Installation Procedure


    Object Number: 492770  Size: SH

  1. Install NEW intake manifold gaskets (1) to the intake manifold.
    Object Number:(NNN) NNN-NNNN Size: SH

  2. Install the intake manifold.
  3. Apply a 5 mm (0.2 in) band of threadlocker to the threads of the intake manifold bolts. Refer to Sealers, Adhesives, and Lubricants for the correct part number.

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 63222  Size: SH

  4. Tighten the intake manifold bolts.

    Tighten

    Tighten the bolts a first pass in sequence to 5 N·m (44 lb in).
    Tighten the bolts a final pass in sequence to 10 N·m (89 lb in).

    Object Number: 389993  Size: SH

  5. Install the EVAP purge solenoid (3), isolator (1), and bolt (2) to the intake manifold.

    Tighten
    Tighten the bolt to 10 N·m (89 lb in).


    Object Number:(NNN) NNN-NNNN Size: SH

  6. Install the EVAP purge solenoid vent tube to the solenoid (1) and vapor pipe (2).
    Object Number:(NNN) NNN-NNNN Size: SH

    Important: Lightly coat the MAP sensor seal with clean engine oil before installing.

  7. Install the MAP sensor (1) to the intake manifold.
    Object Number:(NNN) NNN-NNNN Size: SH

  8. Install the PCV hose.
    Object Number:(NNN) NNN-NNNN Size: SH

  9. If equipped with vacuum assisted brakes, install the vacuum brake booster hose to the rear of the intake manifold.
  10. Route the electrical harness into position over the engine.
    Object Number: 679510  Size: SH

  11. Connect the knock sensor harness electrical connector to the intake manifold.
  12. Connect the following electrical connectors.
    MAP sensor (1)
    Knock sensor (2)
  13. Install the fuel injectors. Refer to Fuel Injector Replacement .
  14. Install the throttle body. Refer to Throttle Body Assembly Replacement .
  15. Knock Sensor Replacement

    Removal Procedure


      Object Number: 832149  Size: SH

    1. Remove the intake manifold. Refer to Intake Manifold Replacement .
    2. Gently pry up the rubber covers.
    3. Disconnect the knock sensor electrical connectors.
      Object Number: 309864  Size: SH

    4. Remove the knock sensors.

    Installation Procedure


      Object Number: 309864  Size: SH

      Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

    1. Install the knock sensors.

      Tighten
      Tighten the sensor to 20 N·m (15 lb ft).


      Object Number: 832149  Size: SH

    2. Connect the knock sensor electrical connectors.
    3. Push down on the rubber covers.
    4. Install the intake manifold. Refer to Intake Manifold Replacement .
Dan, Auto Technician
Category: Chevy
Satisfied Customers: 3490
Experience: GM Mark of Excellence/ Service Guild Participant with 13 years experience, ASE Master Certified
Dan and 9 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