Another idle thread :-D

[XRated]

Apart from a slight miss at idle, there is one thing puzzling me..

My car struggled to idle when john_xr6 put my Wade cam in, but my car never stalled. So I turned the base idle up a notch and it was fine - when I first start the car, it idles at around 800rpm, but when I leave it for a little while or chuck it into reverse/drive, the revs drop down, and then back up to about 400rpm.. (Lights will quickly fade and then come back to normal - like the alternator loses charge for a second) That's not too bad, but when I drive and come to a stop ie. at traffic lights, the rpm sits on about 500, and slowly eases itself back down and seats at about 200rpm and sometimes drops a bit lower feeling like it's going to stall - but it still never does! :/

Anyway, I was just wondering if the base idle is set higher, would it be unusual for the ECU to get used to things, and adjust the idle back down so it sits at the low 200rpm mark? What other things can affect what rpm it idles at?

Crazy cars!! :

[stockstandard]

That sounds like one of the problems I encountered. Sounds like the base idle is to low. What happens if you unpluig the ISC?

luke the first line on your tacho is 500 rpm ;) you can borrow my stock ECU and see if that helps at all if you want.

[InitialD]

Luke, your car has allways seemed to idle low since ive been in it/driven it, etc. I actually remember saying to you once "Damn man, that idles low"

When you set the base idle, did you put the car in diag mode? apparently the ecu needs to lern the base idle? I had the same problem with my old motor wanting to stall/die after idling for longer then 5sec or so.

After setting the correct idle for the car in diag mode, the idle was fine.

I wonder if this has anything also todo with your strange exhaust sound at high RPM? :

[ned]

I had the exact same problem, and when I unplugged the ISC, it would crank over but couldn't hold idle long enough for it to stay on. Idle would bump up, drop back down, almost stall, then sometimes it WOULD stall. As I have previously mentioned fuel was pouring outta my exhaust, I was possibly getting valve overlap?

Maybe I'm complaining too much? LOL, but for the hassles I was getting driving it everyday, stop-start, it wasn't worth it for me. Luke when I experienced your problem, my MAP sensor was going nuts, it didn't know what the f#ck was going on, I put the stock cam back in and worked fine.

[chelvdog]

Out of interest, how do you put your car in diagnostic mode?

[EA2BA]

in an EA-ED (pretty sure up to ED), there is a plug in the engine bay near the brake booster (trapezoid), that has two other wires with it, a round one blue/red strips is tacho output, and a white(grey)/red stripe that is for the computer ground for diag mode.

Ground the wire, start the car it revs up to 1500rpm or so, fluffs around then settles back to base idle, you have about 2mins to make changes then it drops out of diag mode.

[I am sure I have that right, my car has been diag mode nearly every night this week]

EB2-ED is different. the plug is under the fuse panel on the dash and you bridge the the top and bottom wires closest to the steering coloumn.