Raising idle

Discussion in 'Performance & Fuel' started by Jeff Dodson, Dec 24, 2013.

  1. Jeff Dodson

    Jeff Dodson Member

    How do I raise the idle, IF POSSIBLE, I'm guessing by adjust throttle position sensor or something,. How do I do that , 99 GMC z71 NBS 5.3
  2. Jeff Dodson

    Jeff Dodson Member

    So I'm guessing t,here is no way to raise the idle just a tad ????
  3. Enkeiavalanche

    Enkeiavalanche Rockstar 4 Years ROTM Winner 5000 Posts

    Why do you want to?
  4. Pikey

    Pikey Moderator Staff Member 3 Years ROTM Winner 1000 Posts

    I believe that it is all computer controlled. You may be able to use a tuner or programmer to raise it.
  5. Jeff Dodson

    Jeff Dodson Member

    It is a bit low. It has a minor stumble but it's only at idle. It's idling about 400 in drive.... It has even died once, not a real problem though... Now check engine lights. I can't find the stumble, it's like a miss, but had the firing check on a computer, does not show a coil missing, new spark plugs and wires....it just seams like the idle is just a tad low
  6. 08_rado_rocker

    08_rado_rocker Member 2 Years 500 Posts

    I believe the only way to really adjust your EIS is through the PCM... which would mean having someone with a legitimate tuning program (HP Tuners, etc) do it, or a technician with GM that has a TechII
  7. Enkeiavalanche

    Enkeiavalanche Rockstar 4 Years ROTM Winner 5000 Posts

    Have you changed the Fuel filter? Clean the TB? Pour some Seafoam in her and use the spray Clean it up a bit and see what happens..
  8. Jeff Dodson

    Jeff Dodson Member

    Yea I did all that. Well havnt done the WHOLE sea foam thing, I do need to do that but figured maybe a slight adjustment in THROTTLE CONTROL SENSOR maybe... Maybe not

    99'HEARTBEAT Epic Member Staff Member 5+ Years ROTM Winner 1000 Posts Platinum Contributor

    With your Trucks Low Idle at times and now the Check Engine Light is coming-on, I'm guessing that these 2-items are Tied together, you should have your Trucks Computer Scanned, to see what Code is Triggering the CEL to come on.

    Regarding the low idle....I would start by checking for Vacuum Leaks.......at the PCV Hoses, Hoses and Connections for the Air Intake System, and the Intake Manifold.....as Vacuum Leaks, can throw off your Trucks Computer,

  10. Jeff Dodson

    Jeff Dodson Member

    I'm sorry, I should read these before I submit, I'd does NOT have a check engine light. I had a guy check the firing on his computer... Does not show any misfiring or weak firing. The truck runs great... Just a little stumble at idle in drive... I have changed the fuel filter, cleaned the TBI, have not done the sea foam other than running it through the fuel tank

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