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Old 01-24-2004, 06:05 PM   #1
TyranosaurusWRX
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Default Changing idle setting?

Are the RPMs at idle determined by the computer? I noticed that there was a screw at the throttle arm to set the idle a little higher. I tried this and it bumped it up for a little bit and then went back down to normal idle.
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Old 01-24-2004, 07:36 PM   #2
PaulRex
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You cant use the screw, you need a DeltaDah or a standalone like a Link I guess. The idle is controlled by the idle air control solenoid thing.
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Old 01-24-2004, 07:45 PM   #3
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I guess it's just there for ornamentation.

I read thread or two about the IAC solenoid today, it may be the problem.
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Old 01-24-2004, 08:01 PM   #4
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The screw is to set the minimum throttle plate opening but it's not for idle adjustment. The ECU maintains the correct idle speed by controlling the IAC, and as you found out if you mess with the stop screw the ECU will compensate.
What exactly is your problem?
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Old 01-24-2004, 10:39 PM   #5
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i got a problem that i have been tring to fix for weeks! the idle will fall after coming out of a gear to about a stalling point then go right back to normal! doesnt happen all the time and there is not one leak have checked over and over again
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Old 01-25-2004, 12:27 AM   #6
nhluhr
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Quote:
Originally posted by one wicked wrx
i got a problem that i have been tring to fix for weeks! the idle will fall after coming out of a gear to about a stalling point then go right back to normal! doesnt happen all the time and there is not one leak have checked over and over again
Use deltadash to raise the idle speed a couple hundred rpm
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Old 01-25-2004, 12:49 AM   #7
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Quote:
Originally posted by one wicked wrx
i got a problem that i have been tring to fix for weeks! the idle will fall after coming out of a gear to about a stalling point then go right back to normal! doesnt happen all the time and there is not one leak have checked over and over again

I have the same problem. What are your mods? This happened to me after installing a front mount intercooler. I believe it might also have something to do with the super rich condition that I'm creating with a blow off valve that is venting 100% atmospheric. The lengthened intercooler piping combined with the ecu thinking it'll get air that's not being recirculated I think is messing up the idle when I clutch in. It's stalled out on me a few times at stop lights and during slow turns in neutral. I'm planning on recirculting the bov to see if this helps any.
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Old 01-25-2004, 02:24 AM   #8
one wicked wrx
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i have a stock bov but many other mods
headers
up pipe
downpipe to a 3" catless exhaust
short ram intake
colder plugs
i/c hoses
inlet pipe
fuel pump
utec
pulley

might be running really rich dont know really how to mess with the utec just yet
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Old 01-25-2004, 06:14 AM   #9
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Quote:
Originally posted by imprezive one
I have the same problem. What are your mods? This happened to me after installing a front mount intercooler. I believe it might also have something to do with the super rich condition that I'm creating with a blow off valve that is venting 100% atmospheric. The lengthened intercooler piping combined with the ecu thinking it'll get air that's not being recirculated I think is messing up the idle when I clutch in. It's stalled out on me a few times at stop lights and during slow turns in neutral. I'm planning on recirculting the bov to see if this helps any.
I've seen phil from turboxs mention once or twice that if you have a FMIC and are cruising at highway speeds put the clutch in and go nuetral the engine can stall. I guess not always, but if he mentioned it and you mentioned it then it must happen.
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Old 01-25-2004, 01:53 PM   #10
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Quote:
Originally posted by PaulRex
I've seen phil from turboxs mention once or twice that if you have a FMIC and are cruising at highway speeds put the clutch in and go nuetral the engine can stall. I guess not always, but if he mentioned it and you mentioned it then it must happen.

problem is, I'm not going anywhere near highway speeds or normal highway cruising rpm's when this is happening... I'll slow down at a stop light going maybe about 20 mph, around 2.5k rpm, and clutch in... the car will fall down to like 1k and then when I'm almost at a complete stop it'll dip below 500 to almost zero and then kinda bump back up to 1k and then sit at 750... but sometimes it'll completely stall instead of bumping back.
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Old 01-25-2004, 09:45 PM   #11
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i feel your pain just wish i knew how to fix my problem and yours
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Old 01-26-2004, 03:06 AM   #12
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Quote:
Originally posted by one wicked wrx
i feel your pain just wish i knew how to fix my problem and yours

yeah... well look on the bright side, at least you're not the only one with the same problem. This way there are more resources to finding the solution and we can relay it to each other if it's found. I'm sure I'll get it sorted out sooner or later, i just don't have the time to right now. It's also colder and snowier than alaska outside so come spring it'll be easier to work on the car. I'll keep you posted if I find anything and I'd appreciate it if you did the same. Do you know when you started having the problem? Mine happened after the fmic install but I see that you don't have an fmic... so we can start isolating things. So far I think the following would be worth looking into:

-bad O2 sensor
-corroded, loose or just plain bad battery grounds
-not enough fuel at low rpm's, too much fuel at low rpm's (I'll have to data log to see what's going on but I don't have a lap top right now)
-?
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Old 01-26-2004, 03:11 AM   #13
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My 04 did that when I disconected/capped off the recic. hose on the stock BOV.
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Old 01-26-2004, 06:09 AM   #14
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I have the same problem, I do have a fmic. I had a bov, switched it back to stock, and the problem happens less frequent. Honestly it only happens about once or twice every 1000 miles. It also only seems to do it when its cold outside. Its been bugging me for a while, I first thought it could have been a vacuum leak. But I couldn't find one.
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Old 01-26-2004, 11:50 AM   #15
imprezive one
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hm... interesting, thanks for the input. I think I'm going to recirculate the hks and see if that does anything.
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Old 01-26-2004, 03:06 PM   #16
TyranosaurusWRX
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Quote:
i got a problem that i have been tring to fix for weeks! the idle will fall after coming out of a gear to about a stalling point then go right back to normal! doesnt happen all the time and there is not one leak have checked over and over again
Hijacker!

Quote:
The screw is to set the minimum throttle plate opening but it's not for idle adjustment. The ECU maintains the correct idle speed by controlling the IAC, and as you found out if you mess with the stop screw the ECU will compensate.
Sorry for the late reply, for some reason I didn't get response notice in my email until today.

I am wondering if the issue is injector related. Over a month ago I put in the UR 785cc injectors. I noticed the idle couldn't quite stabilize after that. It was real subtle but it would consistently rev up a hair once it leveled out at approx 750 rpms- over and over (almost like I was just tapping the accelerator). It has done this for awhile. I just wrote it off as the injectors since they are so much larger, as in the dead time/pulse width deal. Then last week the revs started getting more noticeable. By the end of the week it was going up to 1200 rpms and then down to 500. It even died a couple of times and became difficult to start again. I cleaned the idle air control sensor, even though there are no codes to indicate that it was the problem. No change. The weird thing is, all of a sudden my cruising speed EGTs are way higher than they normally were. I think for now I am going to wire the stock injectors back in and see if the problem persists.
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Old 01-28-2004, 02:41 PM   #17
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Hmmmmmm
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