92 Camaro RS 305 TBI

The issue I am having is the car will not kick down to normal idle, hot or cold, and if it does it runs like crap and the ECM bumps the idle back up. I did find a vac leak but i capped it off for now until I get enough line to fix it. The line that I capped it the one in between the TB and distributor that has its own 90 degree angle fitting coming out of the intake.

I cannot find any other vac leaks. I did replace the IAC thinking that was the issue but it didn't change anything. I have no codes

If anyone can point me in some kind of direction that would be great. This is my first TBI car.

Mike

 

I wonder and could be wrong, but would a bad o2 sensor cause this?? Causing the car to run in closed or open loop?? I dont know how to but try testing your o2 sensor.

 

yeah but wouldn't I have a code at least, and wouldn't it still idle down when it hit a certain coolant temp

 

Ok I am not sure what vacuum line you capped off. Their are some you cant clearly cap off. vacuum hose isnt expensive. Go ahead and change it out.

Now to me. Obviously a vacuum leak can cause this. But another item that could cause this is the CTS-coolant temperature sensor. This is located on the front of the intake. A lot of times just the connector is bad. But the sensor goes bad too. If the computer doesnt know the coolant is warmer, it will not be able to adjust. I recomend you take it to an auto repair facility. But unfortunately if you cant afford a vacuum hose I dont think you'll be able to afford to pay someone...I hope you figure it out

 

Im a DIY kinda guy. the other thing is I can afford a vac hose, I just haven't had a chance to get to the store yet. so I blocked it to eliminate it right now. the car is in the garage and not being driven at the moment, I am trying to fix all the problems before i get it on the road. CTS checks out fine and the pigtail appears to be good. is it possible the ICM is going bad?

 

The ICM would not cause that issue. Sorry if I offended you. Was not any intention. Have you went over the car with carb. cleaner and see if you could locate an intake gasket leak or throttle body gasket leak?

 

Yes, I also did a home cigar smoke test to no avail. the intake is tight. im starting to think pick-up coil