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backfiring in the throttlebody

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  • backfiring in the throttlebody

    Ok I just changed my injectors out, moved my coils, and replaced all my hoses and now when I start my car the idle goes up really high and comes down really slow and if you touch the gas it does the same thing and then it will start backfiring in the throttle body and trying to cut off, anybody ever had this problem after changing the injectors?
    =Joel=

  • #2
    Could have a vacuum leak in the injector o ring to manifold, or the TPS is not reading 0% throttle at idle for some reason.
    Ben
    60DegreeV6.com
    WOT-Tech.com

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    • #3
      Ya sounds like a Vacuum leak to me, Inj Oring may not have seated correctly.
      High idle with a slow drop or popping back through TB usually indicate a vacuum leak or very lean condition due to leak.
      As of April 2
      3rd Gen Cavy has 3500 Installed!
      ----------------------------
      Engine: 2006 SV6 3500 LX9
      Trans: 2002 Getrag F23 5speed
      Pcm: 2001 Impala La1 3400 with complete Engine Harness.
      Injectors: #36 GTPs
      TB: 65mm TCE
      Maf: 1999 3400 Montana.
      Adjustable TCE Fuel pressure Regulator
      Walbro W1 255 pump from Racetronix.
      Beverages: Ice Cold CANADIAN.

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      • #4
        Originally posted by SappySE107 View Post
        or the TPS is not reading 0% throttle at idle for some reason.
        ugh...
        1995 Monte Carlo LS 3100, 4T60E...for now, future plans include driving it until the wheels fall off!
        Latest nAst1 files here!
        Need a wiring diagram for any GM car or truck from 82-06(and 07-08 cars)? PM me!

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        • #5
          Originally posted by SappySE107 View Post
          Could have a vacuum leak in the injector o ring to manifold, or the TPS is not reading 0% throttle at idle for some reason.
          So I guess i need to pull the throttle body back off and check the injectors again, huh. Any other solutions on what to do? thanks.
          =Joel=

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          • #6
            Originally posted by jdellinger1980 View Post
            So I guess i need to pull the throttle body back off and check the injectors again, huh. Any other solutions on what to do? thanks.
            Check your TPS sensor make sure it is plugged in. Make sure all the vacuum lines are plugged in too. Did you replace the injector o-rings when you replaced the injectors? Did they seat properly when you pushed the rack down? Did you replace the Upper Intake Gasket when you took everything apart and the o-ring for the coolant under the throttle? Make sure the PCV is pushed in all and also make sure the brake booster vacuum line is correct.

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            • #7
              plug wires in correct spots?
              sigpic New 2010 project (click image)
              1994 3100 BERETTA. 200,000+ miles
              16.0 1/4 mile when stock. Now ???
              Original L82 Longblock
              with LA1, LX9, LX5 parts
              Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.

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