I have a friend whose daughter has a 90 loyale and it seems to have a constant high idle.  he says that the idle stays around 2000 all the time.  I am going to look at it tomorrow and just wanted some suggestions as to possible causes.  Any direction will help me gat it fixed faster.

 

Thanks

 

 

Vacuum lines?

Hey Mdjdc, I would check the vacuum lines first maybe? I know my 85 Brat has a high idle as well that doesn't really seem remedied by the idle screw, I am working on replacing all my vacuum lines (as soon as I can identify all of them). Ah the joys of learning.

I would start by checking for codes. coolant temp sensor, iac, vaccume leaks, and sticking or improperly adjusted throttle cable are possible causes.

Edited April 10, 201312 yr by mikaleda

Hey Mdjdc, I would check the vacuum lines first maybe? I know my 85 Brat has a high idle as well that doesn't really seem remedied by the idle screw, I am working on replacing all my vacuum lines (as soon as I can identify all of them). Ah the joys of learning.

I would stay away from that screw.  Idle is computer controlled.

 

I have heard about cleaning IAC valve.

 

Good luck,

Sam

What mikaleda said plus clean the throttle body if it looks dirty.

Thanks guys.  Right now the coumputer is not throwing any codes.  I will look at all the obvious things first and I will clean the throttle body.

Thanks guys.  Turned out that he had a cracked intake boot and the IAC was sticking.  Replaced both of those and now the car idles at 1000 rpm.

Thanks for the follow up