I have a b18a1 that does not idle correctly. The rpms rise and drop from approx 1200 - 2500 rpms at a times.

The engine runs smooth though when in gear.

I'm throwing no codes.

I have taken the valve on the back of the intake manifold ( coolant runs through it) off and let it sit in seafoam for approx 15 minutes. I did not completley take it apart, only the piece that's held onby 3 screws. The other bolt looking thing I don't have the proper wrench for.

Do I need to take that off too? Should I try a different cleaning method?
Should it sit in some cleaning soloution longer then 15 mins?

 

remove the fitv below the throttle body.........remove the 2 screws where the coolant line goes in.........tighten dow the white cap and reinstall. usually this is the problem.

 

what is "fitv" ?

smoking: could you give the year; do not know what year b18a1 is in ??

 

OK i found the engine. 90 to 93 integra.
i think that will troubleshoot the same as 88 to 91 honda that i posted about over on another thread. you can use this thread to troubleshoot if you have not already got it fixed:

https://www.hondacivicforum.com/m_248797/tm.htm