Have a 89 firebird 2.8 and when i try to do the iac adjustment the way tech says the car wont even start unless i give it gas when cranking and as soon as i let off it dies ..what am i doing wrong?Also installed a new tps adjusted to .68 and still getting a f****** 22 code what gives here man ..need help ,lol

 

If you're doing it like it says then you should be revving it up for several minutes, unplugging the IAC and then adjusting to some very low RPMs (like 400 or thereabouts, right?).

If so, I suspect the problem is that when you try to drop it down to that low ~400 RPM idle it just dies out, right? If that's the case you need to do one of two things:

1. Clean the TB THOROUGHLY- both sides of the throttle plate, and the bore. If it's choked off with carbon you'll choke off the airflow and it'll just die when you go for the low RPM idle.

2. Adjust the TB idle stop screw- they wear down a little over the years just from the metal plate hitting against them every time you go back to idle. 1 full turn is about all it should ever take to adjust back into range, though, assuming it hasn't been monkeyed with.

Remember- you set the low idle RPM FIRST!!!!! THEN you adjust the TPS to get correct idle voltage. Other way around is nothing but frustration.

 

my throttle blade isnt even close to touching the screw so whats up with that?>

 

sounds like someone was monkeying around with it to me...
follow the last posts advise... turn the stop screw so that it pushes the throttle up about 2 milimeters then try adjusting the iac...like tech says... get the rpms to around 700( park/Nuetral)
then check the voltage on the TPS and adjust as neccesary... Then check the idle and see if it is ok..if that doesnt work then you might have fuel pump problems, or timing or otehr stuff

 

Yeah i am going to do that ...but i took it to the garage today and i have a bad tps even tho its new ...am getting another one tomorrow and putting that in and then will be adjusting the iac first then the tps!! hopefully i willl have it licked i will let you all know!!

 

we'll heres the new deal put in a new tps and adjusted it to .070 on a fluke meter am i doing this right full throttle i only have a little over 4 volts it runs good!but that f****** light is still on!!!!!: code 22 mad: i still cant adjust the iac the way tech says car will not stay running ...ready to burn the damn thing to the ground !!!! lol