97 Lumina EGR Valve and O2 sensor Question?

[jeffcoslacker]

Do you have the origianal EGR on it now, or the junkyard one? Make sure you haven't dislodged any vacuum lines during all this...might wanna see if the same contamination is in the IAC now...maybe it's not closing all the way when the motor is started....

Does it do it only on cold start, or any restart?

[gixxeracer87]

I have the junk yard EGR on there right now. I did pop off a couple vacuum lines in the process, but I think I got them all back on. I'll go double check. I cleaned the throttle plate and stuff while I was in there. It's possible that I might have gotten something in the IAC. I guess I need to tear it apart again and check it out. It's not just cold start ups, it can happen on warm ones also, but it doesn't necessarily do it every time I start the car.

[94Z28Conv.]

One of the two holes in the egr plate runs back into the intake, mine was really stopped up and throwing out o2 codes and egr codes, I cleaned the hole out with a peice of stiff but flexible cable in a cordless drill. I havent had any codes or idling problems since. Maybe check that out.

[gixxeracer87]

Yeah the port was clogged, and I went in through the throttle plate and cleaned it out. The misfiring was due to spark plug wires. I changed the spark plugs, and the oil, and sold the car to a friend of mine. I got a guy at AutoZone to let me borrow his scanner so that I could clear the codes. My friend said the check engine light came back on again. She's suppose to go have it checked out, and then I'm going to continue fixing the car for her. Thank you guys for all your help!