okay i have a 92 4dr eg8 sedan lx with a b20b swap that i did myself with ls tranny its giving me idling problems once it warms up it just wants to die or idles at 800-1000rpms then just drops almost completely to 0 and wants to die but then jumps back up to 800 and then does it over again
please i really need help doesnt have a check engine light and im running a stock p75 obd1 ecu i need to get my car back on the street this week please help

 

please help!

 

might wanna check the pcv valve...and more sad news...my bone stock ls powered crx did that when i bent a valve over revving it(9800rpm) check cylinder compression....pcv valve should be the best bet though..if u take it off u should be able to blow through it n the ball inside will move and block it...if the valve dont move then its ur pcv valve....ps love ur choice in motors i got a turbo b20 in my 97 ek coupe

 

i know its not a bent valve fersure lol i just did a compression test its all good
hmm might have to try that wouldnt think its a pcv valve ill check it out tomorrow morning thanks for the help

 

does your car have a cat on it?...check that too... a clogged cat with ur stock ecu might not show a check engine but will cause idle surge and near stalls when warmed up

 

nope not that either because it also did it when i had open header

 

best way to see if its pcv valve is if the car doesnt like to idle in extreme cold but i dont know how cold it gets where u r....thats about all i can think of...best of luck man

 

Check your idle screw bet thats your issue they come loose pretty damn easy. thats what my car was doing and i just tightened her up and now im fine. located on the throttle body takes a flathead screwdriver if thats all the way tightened down and still got a surge unplug the iac(idle control sensor) on the back of the intake manifold and if ur cars runs you got a vaccum leak in the intake manifold

 

hmm i know its not the idle screw tried that already. but will also try the iac ill try tomorrow to see if that fixes the problem i will let you guys know thanks alot for the help

 

okay well i changed the pcv valve with a new one but that wasnt it.
then i unplugged the iac valve and my car shut off so it wasnt a vacuum leak either
then i decided to try the o2 sensor and it ended up being the dumb o2 sensor it was bad so i replaced and omg it runs perfect now