89 Corsica where is the IAC

[sixseas]

Im helping someone with a 1989 Corsica 4 cyl with multiple problems. It dies at stop lights after warm. I disconnected the TCC selenoid seems like it makes no difference so assume its working. I wanted to take a look at the IAC idle air control but can tell where it is. Does anyone know if its on teh front or side of the TBI body?

[sixseas]

Originally Posted by sixseas

Im helping someone with a 1989 Corsica 4 cyl with multiple problems. It dies at stop lights after warm. I disconnected the TCC selenoid seems like it makes no difference so assume its working. I wanted to take a look at the IAC idle air control but can tell where it is. Does anyone know if its on teh front or side of the TBI body?

I found the IAC its on the front of the TBI. Looks like black cylinder the inside of mine was all tared up inside likly wouldnt seat properly.

Does anyone know where I can find the correct voltages that are supposed to be at the temp sensors and Map sensor? Im getting error codes 14 and 33 both seem to point to low voltage? Thanks

[jsgold]

Sorry for delay, am up to my neck in problems with cars, garage door openers, and more, LOL. I do not have a manual for the 89 but on my 91 book it shows code 14 as coolant sensor - high temperature indicated. Do not know if this will help but it states at normal engine operating temp the voltage at the ECM terminal B8 should be 1.5 - 2.0 volts. A code 14 is a result of sensor reading temp over 275F. May be an intermitent code, so may be no big deal, or maybe the car overheated badly. Needs a tech 1 tool to measure temp if you can find one as part of diagnostics. It states that circuit 410 being shorted will also cause this. Not sure if this does much good.
As for 33 that points to MAP sensor, voltage as follows, 1 to 1.5 volts at closed throttle, 4.5 tp 4.8 at wide open throttle. Can cause a code if pressure is low, raising voltage, TPS problem, or bad map sensor.

[sixseas]

Originally Posted by jsgold

Sorry for delay, am up to my neck in problems with cars, garage door openers, and more, LOL. I do not have a manual for the 89 but on my 91 book it shows code 14 as coolant sensor - high temperature indicated. Do not know if this will help but it states at normal engine operating temp the voltage at the ECM terminal B8 should be 1.5 - 2.0 volts. A code 14 is a result of sensor reading temp over 275F. May be an intermitent code, so may be no big deal, or maybe the car overheated badly. Needs a tech 1 tool to measure temp if you can find one as part of diagnostics. It states that circuit 410 being shorted will also cause this. Not sure if this does much good.
As for 33 that points to MAP sensor, voltage as follows, 1 to 1.5 volts at closed throttle, 4.5 tp 4.8 at wide open throttle. Can cause a code if pressure is low, raising voltage, TPS problem, or bad map sensor.

I understand being overloaded with things, good to be busy but man o man all my friends bring their computers and now cars to me because everytime they go to a mechanic they get hit for $4-5 hundred and the cars right back down in a couple weeks. Next time I meet someone first thing Ill ask is do they have a bumper to bumper warrantee if they say no Im just going to yell and run. Thanks thats a big help I found 5vdc at heat sensor and Map on a cold engine with fan running will look deeper.