90 civic with poor combustion engine

[ryanryan]

condition : engine with 350000 kms and internal engine damage maybe caused by bad valves, and compression rings.

trying to maintain idle by turning the idle screw above normal 800 rpm
caused a surging engine

the following is what i have gather or assumption

ECU will cut fuel to injector in order to conserve gas when rpm is above normal with thottle posiiiton closed . example when vehicle is slowing down

ECU will open injector once rpm is under normal 800 rpm thus causing the surge

rpm is determine by distributor signal

how can i maintain high idle without surging ?

the only time that i do not see a surge in rpm is when engine fan on

[90civicrider]

You should have you valves checked out along with your rings. Your valves could have mushroomed tops, or even warped face.

[Tanked]

Some idiot mechanic that worked on my car set my idle at 1200 RPM and it was fine, except that it was wasting fuel.