How do you adjust the idle on a throttle body?
#1
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?
#2
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).
#3
Sounds like rear brakes aren't working ?????
#4
#5
There is a way to adjust it I will have to search for it and maybe link to another forum if it's ok.
#6
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
http://www.thirdgen.org/tpimod2
Last edited by xmradioguy; 10-29-2010 at 02:23 AM.
#7
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...
#8
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.
#9
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.
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