Having problems with your 1990 Chevrolet Lumina ?

My 1990 lumina euro has 125000km on her and runs fine for the most part. Except when she gets warm i will shut her off and when i restart her the engine light is on and she has no tach and idles high. I have replaced the IAC valve, checked the vacum lines and the VSS sensor works. Any suggestions would be apprieciated.

Posted / edited by AnonymousUser on : 23-09-2019

Answers :

1990 lumina and its a her ? is she 2.5 or she 3.1 it doesnt matter its both the same system we will treat it as one type same **** but gets in to heat. To begin with the ICM is the one that sends RPM information to the ECM. without this signal this girl gets blind sided. You are a OBD 1 stratagey, and the IAC is a stepper motor, it should of retracted and not delay. When you shut down the and start the car the ECM fire in every order in everyway untill it catches then it uses cranksignal and cam signal to synchronize the system and control idle. But the girl doesnot see RPM so she take a while to bring to fuel control. here the steps to to make the girl behave, check the coolant level make sure its filled, The ignition control is not reporting the tach to ECM.it either she went to open loop quickly and that is why I want you to make sure she is filled in the radiator.inspect the coolant temperature sensor and the terminal make sure its good the temperature sensor is at the left front below coolant outlet. And why did you do VSS it has nothing to do with RPM its just a transmission thing, so this girls fix ICM(she needs a tach to send out and the synchonize process begins when the ECM see's it) coolant temperature system went to open loop(that only if she stays full of coolant or water),then she wont be a *****
Repair Help & Product Troubleshooting for 1990 Chevrolet Lumina

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