white91

well i got a used throttle from the junk yard and decided to bore it our at the bottom. Just below the butterfly. I used a flapper drum to take the material off. I also took the sensores off before i started boreing it out. I cleaned it up real good and put the sensors back on and put it on the jeep with a new base gasket. the idle before i started this was at about 900 rpm and now it is stuck on 1100 rpm's. i dont know how to get the idle down. the jeep is a 91 HO automatic. thanks in advance. oh and i did not mess with the surface where the butterfly sits and there is no more light coming through that area than usual.

89Laredo

Reset the computer so it can account for more airflow.
Adjust your TPS, since you said you took it out it needs to be readjusted

96Cherokee113

x2 on resetting the computer. Just disconnect the battery and hold down the horn for 10 seconds so it drains the capacitor in the CPU and fully drains the power from it. That should do it and be sure to drive it easy for the first little while, otherwise if you drive it hard the computer will raise the shift points and it'll drive like crap.

white91

how do you adjust the tps when there is only t srews in two holes. there isnt anyroom to rotate the tps.

89Laredo

Never done it myself, but this should help

Edit: Trying to find right one
Edit 2: I feel like a dumbass, apparently HO does not require TPS adjustment.. Im used to renix.

white91

that diagram is not my setup. that looks like a renix setup. my tps is held on with two torq screws on the back side of the throttle body.

89Laredo

good point, I forgot you had HO.
Ill look for the right one.. lol
sorry

Edit: see above post, I feel like a dumbass now.

93XJLI

you positive you didnt go near the slit where the IAC sits?

white91

what do you mean by going by the slit where the iac sits. i took the iac out from that adaptor it sits in. all i did was take a 2 1/4" flap wheel on a drill press and fed it into the throttle body down to the butterfly. Should i be looking at the TPS or the IAC. I did disconect the battery to reset the computer. after i did that i started it up and it idled down to 950 rpm's. so I took it out for a short drive and it was back up to 1100rpm. I also forgot to say that when i start it up now it will idle at 1800 - 2000rpm's then come down to 1100rpm's

white91

does anyone know how to adjust the idle on a 91 HO? is it completely controled by the computer?

84supersport

As far as resetting the computer just undoing the battery wont reset it. I would undo it hold the two terminals together for 30 seconds or so to reset it.

white91

tried that also. nothing different, still idles at 1000-1100. still can not find how to adjust the idle. i have looked all over.