Im in the process of a repair with a motor rebuild on a 1998 Cavy with the 2.2L OHV, got the motor ready to drop back in, but having a little trouble with the vacuum lines that go on the back of the throttle body. theres 4 vacuum ports on there, one big one, and three small. Did'nt pull the motor but myself but im going to the install. Would any one have a good vacuum diagram or some info on this matter?

if i remember right. the big one goes to the brake booster, one goes to the fuel pressure regulator, one to the evap solenoid and the last one goes into a plastic vacuum line by the brake booster that goes into the car for the hvac knobs.

and i dont think it matters which of the little ports goes where, but i could be wrong.

Exactly what is the hvac knob by the way? just got the car for my 19yr old over the winter, to which he had a whole week and wrecked the darn thing, decided to rebuild the motor because the boy ran it dry untill it shut off. My brother pulled the motor, but forgot to notice were any of the vacuum lines went (go figure) so now that the motors ready to drop back in, i want to brush up on all this stuff before it happens. I noticed that the brake hose for the booster is still on the throttle body, and another smaller hose hanging on the passanger side of the engine bay, plus a small piece of a hose still attached to the fuel p/r. Im just not sure what exactly went to the forth vacuum port.

the hvac knobs are the heater/fan controls on the inside of the car, there are vacuum controlled.

Isn't there a vac diagram under the hood on a sticker?





i find it amusing that SHOoff has nothing better to do but follow me around & be an unhelpful dick in even cross-forum. - Jon Mick

Im not sure about that one, i'll have to check it out, besides before all this, i've never been under the hood of any Cavalier. Yeah this car was intended as a christmas gift for my boy, which turned out to be a bigger headack than what it was worth, because a new driver on ice is a bad mix. He slid on ice and bent the bottom part of the rad support which pushed the radiator hose into the motor, which caused it to loose most of the antifreeze, and it was ran home dry (bad news) for the little 2.2. Yeah i just found this site, which seems to be quite informative.