m20 refuses to idle

[JAM]

well, it hasn't ran in a while. got the urge to go wrench on it a bit, runs like a dream, but no idle. it will stumble and attempt to catch itself, then just fall on its face.

last summer was the last time it ran. it had a super bad idle surge, my guess is from a vacume leak. it would stumble almost as if it were inches away from stauling, then catch itself and rev up. could a vacume leak cause it to not idle at all?

thanks

jam

[Court M3]

bad ICV maybe? Vavumn leak should cause it to idle high

[kenika65]

I would suggest to go ahead and replace all of the rubber on your e30 if you plan for it to run and drive correctly for along time.

And yes a vacuumed leak is a cause of bad or dead idle.

[e30s52]

I would suggest to go ahead and replace all of the rubber on your e30 if you plan for it to run and drive correctly for along time.

And yes a vacuumed leak is a cause of bad or dead idle.

thats where i would start. should run alot better after replacing old and worn out hoses

[Jand3rson]

I would suggest to go ahead and replace all of the rubber on your e30 if you plan for it to run and drive correctly for along time.

Good call. Check all of the rubber hoses, mainly in the intake boot and vaccum lines for cracks or breaks.

Also, check your ICV, sounds like it could be a bad one to me.

[JAM]

gonna swap a known good one from a freinds eta tomorrow. if its def the prob i'll let you guys know, cause i'll be needing one haha

[SchnellerVert]

Eta uses a differant connector. Remove and clean it, check the hoses, try checking the O2 sensor by disconnecting the plug to see if it changes the symptoms at all after checking the other issues.

Oh is it leaking oil? Is the valve cover loose? That will give you idle issue due to vacum loss. The Intake to Valve cover hose loose?

[JAM]

so my intake boot is cracked in a few places. im going to replace it and hopefully that will fix the problem :fingerscrossed:

[kenika65]

You could have used electrical tape on your intake boot.