Ive been searching around for info but can find anything. ok i just put a z6 manifold with 91 ls throttle body on my 89 si hatch and now it idles at 4k! im not getting any codes and every sensor is hooked up. i tried adjusting the idle screw but that didnt do ----.
please help, what could i have overlooked?

 

i have the same on my car with no problems...

check and make sure you didnt leave a vaccum line open

 

does anyone know if the iavc are different from and 89 to a 95? oh and also when i turn it off it diesels for about1-2 seconds.

 

yes they are different...i use a OBD1 IACV on my OBD0, works fine...

 

try adjusting the tention on the throttle cable...it cant be too tight...

 

im putting new gasket maker on the iavc surface. i think that might be leaking cuzz i had to remove it when i washed the intake. its not the cable i havent even tightened it yet. this was suppose to take 1 hour and im going on about 4

 

Either a vac leak or your TB is slightly open.

What did you do with your old manifold and sensors? I need to test mine, but I don't have any spare. My car idles like ---- and runs really rich, but no cels, well, except for the VSS all of the sudden. Wanna trade me cars?
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i would also say the TB is open slightly. the IACV wont let it idle at 4000 RPM, itl just idle like complete dog ----

 

figured it out! im not sure what you call it but it was the lil device with an arm that goes attached to the throttle plate( i think its used to warm up the car). the vacuum line was keeping it open so thats y the idle was so high. you guys are kick ***! i just diconnected that line on it and worked fine.

it feels like i lost some torque with this setup. top end pulls really nice though and power seems smoother. i had to come home cuzz i snapped my alternator belt again at 8k. this is my third one in a week. thats what u get with 5 dollar belts.

anyways dr boost, i traded this manifold for my old one so i dont have it anymore. sorry.


THANKS