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Old 10-14-2009, 08:04 PM   #1
Scoobie2.0
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Default Irratic Idle and Stalling

Okay. Heres the story. My friend just put in an ACT stage 1 clutch/flywheel on my 2004 RS. My RS has a custom turbocharged kit(from previous owner). We finally got the car to start but the idle is rough sometimes. If we drive it, the car runs fine. But when I put the clutch in when stopping, the car stalls 7/10 times. Here are the symptoms I'm having. Speedometer is not working. Rough idle 1/2 the time. Stalls when stopping 7/10 times. Just replaced sparkplugs and battery. I have a Hydra ems. Extremely weird thing is that my throttle body looks nothing like a normal WRX or Sti so we couldn't find the IACV. Do RS's have a completely different tb? Chance of the tb just being rotated? Does the Hydra control idle? Is there a base map I can download? Sorry for all the questions but I haven't had the car back in over 1 month and it is becoming very frustating. Any help would be great.
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Old 10-14-2009, 08:50 PM   #2
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idling problem sounds like a big vacuum leak if it gets better as you drive
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Old 10-14-2009, 08:54 PM   #3
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Sounds like it might be the Idle Air Control. Had the same problem with a legacy wagon. Check all of your vacuum lines.
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Old 10-14-2009, 09:40 PM   #4
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thanks for the replies so far. I am actually thinking that the vacuum line to/from my hydra ems is pinched. My friend was a bit groggy this morning and put the casing back on in a hurry. Will have hi check it once he gets home. Anyone think it might be something other than a vacuum leak? Would a bad ground cause this? Maybe the alternator? And anyone have any idea why the speedometer would stop working so suddenly?(friend drove it to and from work on Monday when we first got it to start and he said everything was working fine)
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Old 10-14-2009, 09:46 PM   #5
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If your alternator was bad it eventually wouldnt start, not have a bad idle. A bad ground is not likely i dont think. As for the speedo, the only thing i can think of is something went bad with the hydra or you damanged something on the trans while doing the clutch job
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Old 10-14-2009, 09:51 PM   #6
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Speedo problem sounds to be related to taking the trans out. Check your speed sensor connection and look for other loose connections. As far as the other problem, I agree with earlier posts that it sounds like a vacuum leak. You can search other threads for ways to check for this.
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Old 10-14-2009, 10:02 PM   #7
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No VSS to the ECU on some manual transmissions will put the ECU into limp mode.

If it's a vacuum leak, you should be able to hear it as a sucking sound at idle.

Speedo could be similar to what happened to my old Legacy, where the end of the VSS cable RUSTED off, and broke. New cable fixed it.

Also make sure you have properly grounded everything that needs grounds.
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Old 10-14-2009, 10:21 PM   #8
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would the alternator cause it to have a tough time to start? because earlier today, it had no problem starting up but when me and another friend came by to work on it later, it would have a really tough time starting up. But then again it was fairly cold outside. and I will have to check the speed sensor. hoping that it was just loose. i'm worried about the alternator because my friend said that his speedo shut off when his alternator was going bad. thanks again for all the quick responses. hopefully i can update you guys tomorrow. btw what is a VSS?
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Old 10-14-2009, 10:26 PM   #9
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Yes if your alternator was not charging your battery then it would have a tough time starting. Use a voltmeter/mulitmeter and check the static (not running)voltage of the battery (should be high 12 volts). Also check alternator output voltage (car running)... one lead on battery ground and another on the big post under the red rubber cover thats on your alternator... should be around 14 volts. VSS is vehicle speed sensor. it is a sensor on your output shaft that depending on speed, calculates your MPH
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Old 10-14-2009, 10:30 PM   #10
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okay thanks. but the alternator wouldn't have to do with the stalling or rough idle? will probably drive over to my friends house tonight to check the alternator since someone is selling one in MWSOC classifieds if I need to replace it
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Old 10-14-2009, 10:35 PM   #11
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I mean its a possibility that low battery voltage is making it run like crap. (ill admit i dont know about that one. Someone else might). however after you do the battery/alternator test i said before, you will be able to tell if the alternator is bad. If it is bad, your battery will have a low voltage, but you might be able to still use it if it can hold a charge from either your new alternator or a charger...
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Old 10-14-2009, 10:42 PM   #12
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okay thanks. will definitely get my alternator checked. dunno if my friend has a voltmeter but if he doesn't (which i'd be surprised) anyone know if autozone charges to get one tested?
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Old 10-15-2009, 04:31 AM   #13
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okay. redid all of my grounds. the cars starts up and idles great. speedo still doesn't work (couldnt find the sensor or at least I dont think i found it) a pic of the location or description would be great. And still stalls whenever I push the clutch when trans is above 2k. Would the lightweight flywheel cause this? Also know that my IACV would cause this but cant seem to find it. My tb doesnt look anything like the stock wrx or sti. And since I have the hydra, would that delete the IACV and move the function soley to the hydra? Thanks for all the help so far. Anymore would be awesome. Oh and still gonna have my alternator tested.
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Old 10-15-2009, 02:10 PM   #14
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IAC should be on the throttle... It's gonna have an electrical connector on it.

VSS cable should come from your tranny to your car, it probably will be up under your drive tunnel. I can look up this information on NoData tomorrow at school if I have time.
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Old 10-15-2009, 02:22 PM   #15
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okay thanks a ton. having a hard time telling which is my iacv (there are like 4 electrical connectors attached to my tb). also, im pretty sure i found the vss but im not positive. there was an electrical connector attached to my tranny on the left side (side by dp) and i followed it all the way and tightened everything up. didnt do anything so im not sure if it is the vss or if it is just busted
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Old 10-15-2009, 03:04 PM   #16
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If you're going to clean your IAC, then you will need to go down to your local stealership and pick up a new IACSV (Idle Air Control Solenoid Valve, as Subaru calls it) gasket, was about $5 for my car, since when you take the darn thing off, it'll probably rip the gasket.

You could probably ask the parts guy where the IAC is located on your TB (might be the very top), as well as the VSS cable.
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Old 10-15-2009, 03:24 PM   #17
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ya i got the gasket for the iacv for the wrx and sti, but my friend and i couldnt find the iacv anywhere on my tb. doesnt look like the tb from the wrx and sti lol. will probably take it to the dealership and ask them. or, i will take pics of it and post it on here.
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Old 10-15-2009, 03:54 PM   #18
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Okay. Took some pics of the tb.









I'm thinking the one in my last pic is the iacv? Only part of the tb that I saw had a hose attached to it. Assuming its the coolant. Anyone have any guesses? Btw its an 04 impreza rs. EJ251
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Old 10-15-2009, 05:54 PM   #19
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If your flywheel is lighter than 14lbs, you likely to stall. If it is, you will need to balance it out with pulleys on the motor.
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Old 10-15-2009, 05:55 PM   #20
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if the car ran fine before, and suddenly after a clutch replacement started to stall I wouldn't think that it is the IAC valve that is causing the prob.
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Old 10-15-2009, 08:38 PM   #21
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hmm. exactly what do you mean by balancing it out with pulleys?
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Old 10-15-2009, 09:00 PM   #22
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hmm. now just wanna confirm that a lightweight flywheel can cause the stalling. Anyeone else able to confirm that? Because then it would make sense. I bought the friggin 10lbs ACT prolite lol. Could tuning my Hydra be able to compenate for this? Or would I have to balance it out with pulleys? Because I also have a lightweight pulley. Thanks for the help guys.
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Old 10-15-2009, 09:43 PM   #23
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If you can bump the idle up, you might try that.
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Old 10-15-2009, 09:57 PM   #24
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ya was thinking of that. i know i can do that for sure on hydra. dont really know if that will help me with the stalling problem tho. the idle at rest is perfect. the car just likes to stall when coming to a stop. will ask phil from elementtuning. so everyone else think it may be the lightweight flywheel? when i had read up on them, it never said anything about this type of symptom lol. oh well. will soak the entire tb in gasoline and see if that does the trick. btw anyone know if this is even the stock tb on an 04 RS? I was guessing that they'd be the same on all imprezas but then it hit me that the tb would be different since the RS is na. Confirmation on it being a stock tb would be great news lol.
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Old 10-16-2009, 12:07 PM   #25
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By getting ligh10lbs? Holy fast revving batman. LOL that is indeed your problem, that is why you are stalling out. One of my friends had that kind of a problem with a light weight flywheel, which he balanced with lighter pulleys. It is much debatable whether pulleys are good or bad crank/underdrive. In your position I would just resurface a stock flywheel and be done with it. Or not to mess with getting pulleys get nothing lighter than a 14lb I've heard that everything lighter than 14lbs will cause problems. So forget about the vacum lines/ iac valve solenoid, and focus on what u are going to do with your flywheel. You should've researched the problems it causes before going that light.
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