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Idle Help for 420a manifold related

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FallenKing

10+ Year Contributor
84
4
Jul 17, 2012
Columbia, Missouri
So I bought a car that idled really rough but never died. I read some things online that I can clean the MAP sensor and the Idle air control sensor and I did both of those. After I put it together it wont idle at all now. It just dies. Is there something I did wrong?


Also when I was trying to locate the Idle air sensor, I unplugged something that almost looks like an o2 sensor in the middle of the manifold. Is there anyone that knows what the hell that is?


Any help would really be appreciated!
 
Hard to say bro got a pic. Also what did you use to clean the sensors? You might have killed one. Make sure they are plugged in all the way. If your talking about the exh manifold it most likely is a o2 sensor. What's the issue with it?
 
You might be right about the intake temp sensor, Ill post a pic tomorrow, it screws in like an 02 sensor, but It cant be since it's in the dead middle of the air intake. temp sensor makes sense, and yeah I think ill just bite the bullet and get a new sensor from auto zone. Would a bad map cause the car to not idle at all? I know my old 2g eclipse would still run without a MAF for a couple of minutes without dying.
 
@Spooled420a you're a real G broski, I just googled intake temp sensor and that's exactly what came up, a new one of those is 30 bucks I think ill replace that too. Thank you so much, I'm happy it's nothing more serious I screwed up.
 
You were right about the MAP too @Spooled420a I put a new MAP sensor in, the car runs again! However it still runs super rough, I might have to swap the Idle Air sensor, does anyone know if the EGR valve would cause the car to run rough? B/c that's what the check engine light is on for. I'm guessing it does so I already ordered a new one but I'm wondering if that will actually fix the prob.
 
that wouldn't cause it to run rough. Mine is currently blocked off with the port mod done to the egr to trick it .Check your wires running along the egr pipe. the loom might be missing and wires are probably showing which go to the coil pack and cam sensor and throttle body
 
If the egr valve is leaking back into the intake, then it would absolutely make it run poorly. Between the map sensor getting false vacuum readings and displacing o2 with exhaust gases, that don't combust, it can and will run like garbage.

Check the egr for carbon buildup, and clean/replace as necessary. You could block it off, if u don't have smog checks.
 
@tametalon92 you were right on the money, after I replaced that EGR the check engine went out and the car idled at 3k but not rough at all, I unplugged the IAC and plugged it back in to restart it and it fell down to 700 gradually. Now it runs and drives fine. Success, here is how bad the old one was.
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