Ever since I got this car it's had problems idling properly. I've gone through everything from stalling, stuttering to the engine down right shaking.

Cleaning the throttle body (it was disgusting) and the EGR valve (gunked and not 100% closed) fixed most of the problems. I no longer have any issues with stalling and it doesn't idle rough anymore.

However it still has 2 problems. The first one being that it idles at 1000-1200 instead of 750-800. A lot of times its stable at 1000 but occasionally it likes to twitch.
Second "problem" may help diagnose it. Basically when your stopped or in park if you hit the gas, say to 4k. As soon as you take your foot of the gas it drops quickly (like normal) until about 1.6k at which point it practically stops and slowly crawls back down to 1k (takes about 20-30 seconds).

I took the IAC off today thinking that may fix it. Both the motor and the valve we're pretty dirty so I gave them a good cleaning. Before reinstalling it I tested the resistance and got a steady 52.8 on pins 1-4 and 53.2 on the other pins (pins 2-3 I believe). The engine was not warmed up and it was about 48 degrees out. That being said I believe thats still within specs.

But even after cleaning it the problem still persists.
I do have a CEL, I had a mechanic scan it a while back (when I knew about 2% of what I know about cars now) and he said "it's probably an O2 sensor". It's also worth noting that I believe I have a bad head gasket, although I'm uncertain if that would contribute to this.

97 Eclipse GS - BD "Barely Driver"
Slowly bringing it back from the dead.
And yes for the 38th time, I know it's not fast... yet.

Captain Caveman

96 RS Turbo 11.414 @ 119.62 MSNS, Crower 2 NA cams, BW366, 10.5 comp, UDP, 60mm TB, W/A intercooler, 3.55 tranny 567.9whp 430tq
97 RS NA 13.188 @ 103.87 MSnS powered 12.5 comp, Crower 3's and 219.4whp with 175tq
98 RS DD 12.5 comp on stock ECU, LTH, Crower 2's, Koni, GC, Hypercoil, DG hats
99 OZ 5sp Stocker 15.856 @ 85.97
99 GS stocker auto 17.7@77mph!

wiki home page:http://www.2gnt.com/index.php?d=bullettdsm

Cant make it there tonight but I have a 97 so the "keydance" should work. I've heard it mentioned before but never knew what it meant until now. I'll go give it a shot.

97 Eclipse GS - BD "Barely Driver"
Slowly bringing it back from the dead.
And yes for the 38th time, I know it's not fast... yet.

Ok did it a couple times and here's what I got.

12 pause 21 pause 55 (55=done, correct?)

I'm going to look it up and edit it into this post when i find it.

Edit 1: ok 55 is end of codes and 12 is basically because I just reset my ECU when I had my battery out earlier today. Still trying to find the "21" code, sadly the list on this site that everyone links to is down.

Edit 2: Alright correct me if I'm wrong since this is taken from a neon forum but I believe code 21 can mean any of 10 codes. All O2 sensor related, although 5 are for the upstream and 5 are for the downstream. Regardless at least one of my O2 sensors has to be shot, figured.

97 Eclipse GS - BD "Barely Driver"
Slowly bringing it back from the dead.
And yes for the 38th time, I know it's not fast... yet.

According to this list a 21 error code is a #1 injector control circuit fault.

Erik P.
Official 2GNT thread Hijacker
Some say that he's driven over more Covenant than he's shot, and that his grenades aren't where you'd expect them to be...
All we know is, He's not The Stig... But he is The Stig's Spartan cousin!

Captain Caveman

96 RS Turbo 11.414 @ 119.62 MSNS, Crower 2 NA cams, BW366, 10.5 comp, UDP, 60mm TB, W/A intercooler, 3.55 tranny 567.9whp 430tq
97 RS NA 13.188 @ 103.87 MSnS powered 12.5 comp, Crower 3's and 219.4whp with 175tq
98 RS DD 12.5 comp on stock ECU, LTH, Crower 2's, Koni, GC, Hypercoil, DG hats
99 OZ 5sp Stocker 15.856 @ 85.97
99 GS stocker auto 17.7@77mph!

wiki home page:http://www.2gnt.com/index.php?d=bullettdsm

97 Eclipse GS - BD "Barely Driver"
Slowly bringing it back from the dead.
And yes for the 38th time, I know it's not fast... yet.

95 Eclipse GS: 10.5:1, Crower 2's and MSII
186 WHP - 150 WTQ
14.697 @ 93.85 MPH......Gone, but not forgotten
99 420A Avenger: Given to my sister
99 GS OZ: Sold
03 Evo 8: Family Car with balls

Not sure what year they disabled it, but it worked fine in my 97.

Also I could be wrong but I believe that list is for the Scan tool codes. I've seen to very different lists and the one I got that info from specifies it's for the keydance. I'm hoping someone will chime in that's familiar with these codes.

97 Eclipse GS - BD "Barely Driver"
Slowly bringing it back from the dead.
And yes for the 38th time, I know it's not fast... yet.

I am having same problem with my eclipse. My problem is basically what your having with your eclipse. I did the key dance and got back my egr was bad. But i have the same issue with my eclipse with the idling and stalling. I have no idea on how to fix it. I will be cleaning the egr and throttle body this weekend to hopefully fix this idling and stalling issue. If you fix it please list what you did.

If you read my first post you'll see that the stalling and shaking we're problems I had previously. I fixed them by doing what your thinking about doing, cleaning the EGR and the TB. But if your EGR is giving you a CEL cleaning it might not be enough. It will probably still help but your EGR solenoid might be bad and that could be giving you the CEL.

97 Eclipse GS - BD "Barely Driver"
Slowly bringing it back from the dead.
And yes for the 38th time, I know it's not fast... yet.

Erik P.
Official 2GNT thread Hijacker
Some say that he's driven over more Covenant than he's shot, and that his grenades aren't where you'd expect them to be...
All we know is, He's not The Stig... But he is The Stig's Spartan cousin!

I was having an idle issue for the longest time. I changed out everything from intake gaskets to complete fuel rail to no avail. Took the car to get it painted and the guy doing the paint just happened to be a really good mechanic and mentioned that it was a vacuum leak. Told me to spray carb cleaner or throttle body cleaner on the lines to find it. I did and it was the vacuum line that goes to the fuel rail ( It's a 95'). Problem no longer exists.

I CONTRIBUTED TO THE WIKI!
ah... turbo. I love the turbo, the boost, the speed, the sound.
and its all better when you do it yourself. cheaper too.

Sounds like it's at least worth a shot. I'll give it a quick try today and if I don't find anything I'll really look at all the hoses tomorrow when I have more time.

97 Eclipse GS - BD "Barely Driver"
Slowly bringing it back from the dead.
And yes for the 38th time, I know it's not fast... yet.

I got the time to give it all a good look over today. Checked plenty of my hoses and fittings, gave everything a good spraying of TB cleaner, no sign of any vacuum leak.

97 Eclipse GS - BD "Barely Driver"
Slowly bringing it back from the dead.
And yes for the 38th time, I know it's not fast... yet.

Does it only have those symptoms at idle? Does it smooth out while driving and revving to a higher rpm or do it throughout all rpm range or only do it at certain rpms?

I CONTRIBUTED TO THE WIKI!
ah... turbo. I love the turbo, the boost, the speed, the sound.
and its all better when you do it yourself. cheaper too.

It's only at idle. After it's been warmed up for a bit the idle drops down to close to normal range (about 900). But no matter how warmed up it is I still have the problem with it bogging down around 1600-1000 rpm. It seems like something that would be caused by the IAC but the resistance was within spec. A new IAC is only $20 anyway so I might try that out soon for the hell of it.

97 Eclipse GS - BD "Barely Driver"
Slowly bringing it back from the dead.
And yes for the 38th time, I know it's not fast... yet.