3.1L gm question

[thevic24]

i got the vacuum leak fixed but in the process of having idle problems, i messed with the throttle stop screw. does any body know how many turns from closed the throttle is to be
thanks
-Vic

[SpiderGearsMan]

Re: 3.1L gm question

that is called a minimal air adjustment
there are a few ways you can do it with a scan tool , you can set the tps adjustment to .5 volts , you can use a dvom and probe the blue wire and ground to .5 volts , you can run the iac valve all the way in with a thexton tool [got one ] or a tech 1 [got one ] or tech 2 and set the idle to about 700 rpm
you want to get the throttle plate in the correct position or your tps volts will be all messed up

[thevic24]

Re: 3.1L gm question

this is an obd1 system. can i still use a scan tool or is there a special tool or something else. when it is all said and done, the tps volts need to be .5 volts at idle?

[SpiderGearsMan]

Re: 3.1L gm question

tech 1 is the gm obd1 scan tool , you can find obd1 scanners el cheapo on the used market , but you can use a voltmeter [dvom] muliti-meter

[thevic24]

Re: 3.1L gm question

cool.thanks. so with the car running, check the voltage at the tps and then adjust the throttle screw untill i get .5v at idle?

[SpiderGearsMan]

Re: 3.1L gm question

.5 v with the key on engine off

[thevic24]

Re: 3.1L gm question

great thanks a lot. its perfect now. ;D