Page 2 of 6 FirstFirst 123456 LastLast
Results 21 to 40 of 112

What's Your Idle Speed?

This is a discussion on What's Your Idle Speed? within the General Help forums, part of the LSx Technical Help Section category; Originally Posted by SMWS6TA When you rotated the screw did you: As you look at the TB rotate the screw ...

  1. #21
    You've Seen The Butcher GoldenFlame's Avatar
    Join Date
    May 2009
    Location
    Indiana
    Posts
    335

    2009 Silverado Z71
    2003 Corvette MN6 Black

    Quote Originally Posted by SMWS6TA View Post
    When you rotated the screw did you:

    As you look at the TB rotate the screw down or up?

    I'm in the same process of trying to lower my idle rpm and it is running at 1000 rpm still. I took it all the way down and didn't notice any change. Maybe I didn't wait long enough for the motor to warm up.

    I'll try it again.
    Down. I just lowered it so about 1mm of screw is showing up.. My cold starts are only about 800 rpms max

  2. #22
    Likes twisty roads bene's Avatar
    Join Date
    May 2006
    Location
    England but from TX
    Posts
    803

    Light Pewter Metallic
    2K Camaro Z28

    If you are idling that high, you have a vacuum leak somewhere.

  3. #23
    Moderator Firebirdjones's Avatar
    Join Date
    May 2006
    Location
    Arizona
    Posts
    12,552
    Quote Originally Posted by GoldenFlame View Post
    Down. I just lowered it so about 1mm of screw is showing up.. My cold starts are only about 800 rpms max
    That's a pretty low rpm for a cold start. Sounds like something is out of whack.

    I haven't looked recently but I'm pretty sure the stock tune cold start rpm is generally around 1100-1200 and as temp goes up the idle gradually comes down to the set idle speed at operating temp.

  4. #24
    You've Seen The Butcher GoldenFlame's Avatar
    Join Date
    May 2009
    Location
    Indiana
    Posts
    335

    2009 Silverado Z71
    2003 Corvette MN6 Black

    Quote Originally Posted by Firebirdjones View Post
    That's a pretty low rpm for a cold start. Sounds like something is out of whack.

    I haven't looked recently but I'm pretty sure the stock tune cold start rpm is generally around 1100-1200 and as temp goes up the idle gradually comes down to the set idle speed at operating temp.
    I figured it's low, My screw is probably set too low.. but It's better than banging into gear.

  5. #25
    What Would Earl Do? Vexzer's Avatar
    Join Date
    Apr 2007
    Location
    Kirby, TX
    Posts
    230

    Fire
    2002 SS

    Quote Originally Posted by GoldenFlame View Post
    My screw is probably set too low
    My understanding is that you should let that screw alone. It's the TPS that controls the idle. FYI: The TPS is essentially an air bypass restricted by a stepper motor, which controls the idle based on commanded idle settings. If you screw with the screw, the system attempts to compensate for it. You are working against yourself. If your idle has changed, especially on a stock car, something else is wrong; find and fix that. What you are about to learn is that other problems will result if you just start screwing with stuff [no pun intended], then you will be chasing the new problems at no avail because you have changed the baseline. Sorry if this doesn't solve your problem but the whole process controlled by the PCM is somewhat complicated. A one-shot fix suggestion here is tough.

  6. #26
    You've Seen The Butcher GoldenFlame's Avatar
    Join Date
    May 2009
    Location
    Indiana
    Posts
    335

    2009 Silverado Z71
    2003 Corvette MN6 Black

    Quote Originally Posted by Vexzer View Post
    My understanding is that you should let that screw alone. It's the TPS that controls the idle. FYI: The TPS is essentially an air bypass restricted by a stepper motor, which controls the idle based on commanded idle settings. If you screw with the screw, the system attempts to compensate for it. You are working against yourself. If your idle has changed, especially on a stock car, something else is wrong; find and fix that. What you are about to learn is that other problems will result if you just start screwing with stuff [no pun intended], then you will be chasing the new problems at no avail because you have changed the baseline. Sorry if this doesn't solve your problem but the whole process controlled by the PCM is somewhat complicated. A one-shot fix suggestion here is tough.
    The problem with that is that the TB I received was set higher than my stock TB.. So I adjusted the screw because my Idle was high and it was banging into gear,.. Its been the way it is for 15,000mi so I'm not really concerned

  7. #27
    Junior Member enjun's Avatar
    Join Date
    Jan 2007
    Location
    Georgia
    Posts
    85

    Red/Black
    1999 SS SLP#1507

    How about with the ac on?

  8. #28
    Moderator Firebirdjones's Avatar
    Join Date
    May 2006
    Location
    Arizona
    Posts
    12,552
    The computer will maintain the programmed idle speed in the tune when the AC is on.

  9. #29
    Senior Member wileyCoyote's Avatar
    Join Date
    Oct 2005
    Location
    Centerville OH
    Posts
    1,591

    blue
    1999 TransAm

    my engine idles faster w/ the a/c turned on...

  10. #30
    Member tpilews's Avatar
    Join Date
    Aug 2005
    Location
    Tampa, FL
    Age
    34
    Posts
    918

    Black
    '98 Z28

    Quote Originally Posted by wileyCoyote View Post
    my engine idles faster w/ the a/c turned on...
    same here

  11. #31
    What Would Earl Do? Vexzer's Avatar
    Join Date
    Apr 2007
    Location
    Kirby, TX
    Posts
    230

    Fire
    2002 SS

    Quote Originally Posted by wileyCoyote View Post
    my engine idles faster w/ the a/c turned on...
    It seems to smooth the cam lope a little, cutout sounds a little deeper.

  12. #32
    Moderator Firebirdjones's Avatar
    Join Date
    May 2006
    Location
    Arizona
    Posts
    12,552
    Quote Originally Posted by wileyCoyote View Post
    my engine idles faster w/ the a/c turned on...
    Quote Originally Posted by tpilews View Post
    same here
    Then the both of you have the idle requested in the tune to be higher than normal idle speed when the AC is turned on.

    Mine is tuned to stay the same speed with AC on or off.

  13. #33
    Moderator Firebirdjones's Avatar
    Join Date
    May 2006
    Location
    Arizona
    Posts
    12,552
    Quote Originally Posted by Vexzer View Post
    It seems to smooth the cam lope a little, cutout sounds a little deeper.
    That's because you are putting a small load on the engine with that compressor running. My wifes 2000 SS camaro with a small cam does the same thing.

    Even my old chevelle with AC and no computer controls will smooth the engine just a tad when I turn the AC on,,,again,,,because I'm putting a small load on the engine with the AC compressor.

  14. #34
    Senior Member Naaman's Avatar
    Join Date
    Mar 2010
    Location
    AZ
    Posts
    1,361

    Cayanne
    98 Z28 Vert M6

    Installed my PP TB yesterday and engine runs a lot smoother and revs with more urgency.

    But I noticed after a 20-mile drive to work, when I pushed the clutch in (this was while I was parking), the rpm jumped up to 1200. I know that pushing the clutch frees up the engine from parasitic losses, which causes the rpm to momentarily rise, but I held it there for a good 15 seconds and the rpms remained stable at 1200. This is higher than the usual (if abnormal) 1000.

    Could it be due to improved air flow, thus... more power at at idle...? Before driving to work, the rpms settled at the usual 1000 after warming up, FWIW.

  15. #35
    What Would Earl Do? Vexzer's Avatar
    Join Date
    Apr 2007
    Location
    Kirby, TX
    Posts
    230

    Fire
    2002 SS

    Quote Originally Posted by Naaman View Post
    Installed my PP TB yesterday ... when I pushed the clutch in (this was while I was parking), the rpm jumped up to 1200
    There is a procedure for setting the TPS. If you didn't, you probably need to.

  16. #36
    Senior Member wileyCoyote's Avatar
    Join Date
    Oct 2005
    Location
    Centerville OH
    Posts
    1,591

    blue
    1999 TransAm

    1200, 1000 rpms idles, that just sounds hight to me.. mine is stock.. .i'd say that the cold idle is probably more like 1000 rpm, and the warm idle is more like 650-700 rpm. w/ the a/c on these are a bit higher.

  17. #37
    Retired NOT tired SteveC's Avatar
    Join Date
    Jul 2005
    Location
    Poway, Ca
    Posts
    1,126

    SOM
    2001 Z28 (Sara)

    I have a performance TC installed, and the tuner set the idle to 700 RPM warm, @ startup it is 1200 rpm, then it decreases when the engine gets progressivly warmer.

    SteveC

  18. #38
    Senior Member Naaman's Avatar
    Join Date
    Mar 2010
    Location
    AZ
    Posts
    1,361

    Cayanne
    98 Z28 Vert M6

    Alright, after solving my spark plug issue, I took the car for a spin. I let her warm up for about 4 mins and was idling at 1000 rpm before I started rolling. I went for a 15-ish-mile drive and when I got to the stop light at the off ramp, I engine braked and then clutched in. The car came to a stop and with the clutch still pressed in, the rpms stabilized at 1500

    I hooked it up to the scanner and got this code: P0507...

    Idle control system rpm high... (we need a "captain obvious" smiley).

    What is the idle control system? What can cause it to run high?

  19. #39
    Spaz is My Mentor SMWS6TA's Avatar
    Join Date
    Feb 2009
    Location
    Ugy Lower Corner of AL
    Posts
    10,511

    Navy Blue Metallic
    98 T/A w/a little mods...

    did you get a CEL?

    I think it is the idle air control sensor. not 100% sure

  20. #40
    Member Faught's Avatar
    Join Date
    Jun 2010
    Location
    round rock TX
    Posts
    354

    white
    1999 Trans Am

    hmm mine must be low, when it's warm my idle is around 500rpm

Page 2 of 6 FirstFirst 123456 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Average Idle Speed
    By TransAm11973 in forum General Help
    Replies: 12
    Last Post: 09-02-2009, 08:39 PM
  2. idle speed
    By m1a2d3 in forum Camaro / SS
    Replies: 8
    Last Post: 09-15-2008, 01:46 PM
  3. high idle speed ???
    By paq in forum General Help
    Replies: 4
    Last Post: 04-07-2007, 07:50 AM
  4. Stock idle speed
    By IRACE2 in forum General Help
    Replies: 21
    Last Post: 03-01-2006, 04:42 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •