I am having idle problems and have datalogged some info but dont know what to do with it or what it means. If I give someone my logs can neone tell me whats going on?

 

Try to explain the problem a little here, and let's see what people think. Idle problems can mean ANYTHING, really, there are a million things that can cause problems, but some problems are easy to diagnose.

 

My car goes into closed loop and when I stop at lights and let the idle drop it goes down to 600 for a sec and then drops to like 400 then back up and then down again and eventually dies. The problem didn't occur until I put headers on. I left the O2 off at first (ran fine for this duration) cause the hedmans I ordered didnt have a hole and I had to wait 'til I got a bung welded on. I finally got one installed (Bung from Jegs, O2 Bosch Brand New) about 2 months ago right before I moved for school. Then this idle thing started phasing in until it got this bad and now its dieing at lights. Hope that helps a little more.

 

I replied to your other post asking the same question.. (why double post it?!?!?!?)

Anyway, sounds like you need a heated O2 sensor. Very common with headers.

 

Lots of people like to stick to their different forum sections thats why I posted it more than once, to get several different opinions. Anywayz, thanks for the input I'm gonna give this a shot. Wouldn't surprise me if it ran smooth again afterwards.

 

Also, you may have a leak which causes false readings.

 

Definitely check for exhaust leaks as they will trick the O2 into thinking you're running lean. Also read the Delco O2 thread.

 

Alright, I just got done installing a heated sensor and resetting the computer. It still drops the rpm's a bit at idle. Is this due to the fact that I just reset the comp. and it will even out in a couple days or is something still wrong?

 

No, everything should be fine. When adding headers (only) to an otherwise bonestock engine, the ECM will work fine as is.

You have a different problem. Given the only change was the addition of the headers, my immediate reaction is an exhaust leak. In fact, the O2 is so sensitive to exhause leaks, that a minor leak AFTER THE CAT caused my car to run erratically.

I knew I had a small leak, but I didn't think that a small leak after the cat would affect anything and proceeded to do a ton of scans to see if there was something else...nothing stood out. Everything looked fine, except for the erratic idle.

So I went to a muffler shop and had them weld in a new Y-Pipe after the cat and the engine ran perfect. So don't discount a leak, no matter how small. And, if you just "slipped" the headers on in front of the cats, get them welded up too.

I can suggest other things to look at, but given that the problem developed almost immediately after you installed the headers, suggest the problem is with the header install. Re-torque all the bolts and inspect all the parts carefully for leaks.