(B18C1) idle bounces up and down between 1500 and 2 warmed up. stock ECU. any suggestions?

 

Check your IACV and your FITV. Is your car OBD1 or OBD2?

 

could be a bubble in the coolant as well. look for any opend valves on the IM. aka if you see a hole put your finger over it. if it stops bouncing you found the problem.

 

try taking you IAC valve off, it is located on the back of your intake manifold. try cleaning the screen on it with carb cleaner and spray the carb cleaner in the other hole also. if it still occurs try replacing your IAC. same thing happened to me.

 

yea i was thinkin IAC. thanks for the advice i'll try cleaning it. by the way my car is OBD1.

 

definetly your iac

 

I'm leaning towards your FITV too if it still occurs while it's warmed up...Mine did the same thing..

 

Mine does the same thing... Let me know what you do and how it works out!

 

no problem let me know how it works out

 

vacume leak