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  #1  
Old 10-28-2010, 08:09 AM
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Default How do you adjust the idle on a throttle body?

Have a 1989 K5 Blazer and the idle is a little high. At icy instersections, when stopped, the rear wheels want to push me through. How does one adjust the idle on these throttle bodied units?
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Old 10-28-2010, 08:11 AM
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It is controlled by the ECU. I would check to make sure that you do not have any broken/cracked/disconnected vacuum lines and that there isn't a gasket leak between the throttle body and the intake manifold (somewhat common problem).
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Old 10-28-2010, 10:45 PM
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Sounds like rear brakes aren't working ?????
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Old 10-28-2010, 11:26 PM
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Quote:
Originally Posted by 6.2 man View Post
Sounds like rear brakes aren't working ?????
agreed, mine did the same untill i redid my rear brakes...

I actually had to put it in neutral to stop, or 4wd(kept hubs locked in the snow).

Last edited by 69chevelle; 10-28-2010 at 11:29 PM.
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Old 10-29-2010, 02:11 AM
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There is a way to adjust it I will have to search for it and maybe link to another forum if it's ok.
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Old 10-29-2010, 02:18 AM
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People will argue and say this won't work or you can't do that only the ecm adjusts idle speed, but trust me it does work I have done it to more than 1 tbi and it won't screw anything up. I have done it on my stock 4.3 tbi I have done it on my 5.7 jimmy /holley 670 tbi and lots of others,if you need it I have a pic of where the idle screw is hidden on the tbi's
http://www.thirdgen.org/tpimod2
Attached Images
File Type: jpg tbi idle screw.jpg (42.5 KB, 31 views)
File Type: jpg tbi idle cap.jpg (41.8 KB, 26 views)

Last edited by xmradioguy; 10-29-2010 at 02:23 AM.
  #7  
Old 10-29-2010, 05:54 AM
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You can change base idle on just about any older setup. However, that is kind of just a bandaid. You haven't really solved the problem...
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Old 10-29-2010, 05:12 PM
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Well it adjusts the idle speed without the ECM correcting it so yes technically it does solve the problem but like I said some people always argue even if they have never done the procedure.
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Old 10-29-2010, 06:52 PM
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Assuming there are NO other reasons for the high idle, you would be correct. However, if there is a vacuum leak, adjusting the base idle will not fix the leak.
Old 10-29-2010, 06:52 PM
 
 
 
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96, adjust, adjusting, blazer, body, chevy, full, gmc, idle, jimmy, k5, size, speed, tahoe, tbi, throttle


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