aljohnsonii

i have a 89 camaro with tbi it idles high ive changed the iac and chased all the vaccuum hoses and i cant find anything outta place it does have an idle at 2000 and a driving down the highway at 3500 at 45 and 4500 at 60 im out of ideals need some advice on how to fix it ive put a new tac directly up to the coil and its right on the dash gauge so i know its right it has a 305 with a 5 speed

DSGx

does the motor actually feels like its going at 4500 rpm ? Really if ur engine is going 4500 rpm u should atleast be doing 100+ mph in 5 gear on the highway , i think ur problem is somewere else. Even tho u used a different tac directly on the coil there could be a false reading being send from somewere else.

torque_is_good

is the 2,000 rpm at idle when it's in neutral? As for the 4500 rpm at 60mph, in what gear do you have it?

Seriously, find someone with a dwell/tachometer or a more expensive timing light with tach and verify.

aljohnsonii

at netural its idleing at 2000 and when im driving down the road in gear its at 3500 when i push the clutch in it hovers there untill i start to stop and when i get to a complete stop its slowly returns to 2000 i had it put on timming light at my friends mechanic shop and it read right on the money i thought that the tach i had might been off but both of my tachs are on and it soulds like its doing to 2000 when i crank it up it spikes to 4500 and returns to 2000 when i crank it
and my cruise controll dont work

Ronny

iTrader: (1)

Can you see the IAC functioning? Key on engine off you should see it cycle. Same if you jumper the ALDL. It may be stuck open? check fuse.