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Old 11-24-2009, 07:22 PM   #1
JSidik
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Default erratic idle and violent shaking

So, I've got a few problems with my wrx, it's a 2002, and I've been having these problems for a few months. I havn't been driving it much while I've been having them, because I've been worried it will cause damage. When I start up the car it will idle a little high to warm up like normal, but it only drops to 1500 RPM after it's warm. That's what the idle will stay at throughout driving. When I drive the car it runs alright, except for violent shaking during low rpms in 1st and 2nd gear, It stops when I engauge the clutch, and I start driving again and it's fine. However, when I'm driving in higher gears and then coast in neutral or with the clutch in the rpm's will jump from 1300 to 1800(not exact) continuously until I come to a stop, then it stays at about 1400. I've got some mods, and I recently rebuilt my motor. The problem happened before I rebuilt the motor and is identical now, So I don't think it's mechanical. I've got a full catless system, K&N drop in filter, and other various mods. (not large scale) I also have a Stage 2 xpt tune, which made it run better, but didn't fix the problem. I've tried cleaning the MAF Sensor, Cleaning the idle air control valve and replaced the gasket, reseting the ecu, and a number of other things. Any input would be great, i'm running out of ideas. thanks guys.
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Old 11-24-2009, 07:26 PM   #2
Haelan
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Have you checked the throttle linkage? Push down on the throttle body levers and make sure they're all the way down. If the cables are too tight it can leave you throttle slightly open creating higher idle RPM.
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Old 11-24-2009, 07:44 PM   #3
paintbing
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+11,000,000,000 - Tight throttle cables FTL!
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Old 11-24-2009, 07:59 PM   #4
JSidik
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I've checked the throttle cable, and it's not pulling . Plus when I log my car the throttle plate angle is at 0% at an idle. I'm going to check the cruise control cable tomarrow, and see if that's the problem, I've been reading on a lot of posts where that is the problem.
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Old 11-25-2009, 10:01 AM   #5
JSidik
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tried adjusting cables, and no improvement. I did find out that when the rpm's jump the throttle doesn't move.
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Old 11-25-2009, 11:46 AM   #6
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Aside from completely swapping out the IACV I'm not sure what else you can try. I'm surprised you're not throwing an IACV code due to the erratic idle.

Have you cheked for any pending codes in the ECU?
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Old 11-25-2009, 12:07 PM   #7
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Quote:
Originally Posted by JSidik View Post
I've checked the throttle cable, and it's not pulling . Plus when I log my car the throttle plate angle is at 0% at an idle. I'm going to check the cruise control cable tomarrow, and see if that's the problem, I've been reading on a lot of posts where that is the problem.
unbolt your throttle cable from your intake manifold and tell us what happens. There should be no slack and therefore throttle body should be fully closed
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Old 11-25-2009, 12:11 PM   #8
JSidik
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I've been trying to use ecuexplorer to read my codes, but it hasn't been connecting to my ecu. I'm trying to find a code reader in the mean time. as far as the cables go, the throttle plate reads 0% and is at the stop position(against the metal tab on the device itself.)
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Old 11-25-2009, 03:31 PM   #9
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Your BOV sounds lame
93 RX7+09 Forester

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No ECU codes?

My IACV took a dump a little while ago and it did what you described. When the car throws that code, it opens the IACV to 100% and kills the spark to cylinder #2 to keep the idle down. This results in a high idle, and a god-awful shaking while driving.

...but you don't have the CEL, so I don't know.

front
2---|---1
4---|---3
tranny
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Old 11-25-2009, 08:54 PM   #10
bucket7788
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Check for intake leaks.
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Old 11-25-2009, 09:18 PM   #11
jaxscuby
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Iacv..
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Old 11-26-2009, 09:17 AM   #12
AENIMA
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sounds like an IAC or vacuum leak problem to me. lika said above check for leaks bro.
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Old 11-27-2009, 05:14 PM   #13
JSidik
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I do have CEL's but I havn't been able to read them yet. I'm hoping that will tell me whats goin on.
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Old 11-27-2009, 05:44 PM   #14
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.....

Last edited by Haelan; 11-28-2009 at 08:10 PM.
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Old 11-27-2009, 06:46 PM   #15
JSidik
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.....

Last edited by JSidik; 12-01-2009 at 03:02 PM.
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Old 11-27-2009, 06:52 PM   #16
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.....

Last edited by Haelan; 11-28-2009 at 08:10 PM.
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Old 11-27-2009, 07:25 PM   #17
JSidik
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.....

Last edited by JSidik; 12-01-2009 at 03:02 PM.
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Old 11-27-2009, 07:26 PM   #18
JSidik
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.....

Last edited by JSidik; 12-01-2009 at 03:03 PM.
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Old 11-27-2009, 08:09 PM   #19
bucket7788
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Did you check for leaks yet?
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Old 11-27-2009, 08:15 PM   #20
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Quote:
Originally Posted by Haelan View Post
Great logic--forcing everyone to take a flying guess at the problem when in fact your ECU already knows what the problem is and you purposely withheld that information.

Have fun pushing your busted ride to Autozone for the free code reading. I hope the actual repair costs you a fortune.
Excellent contribution. You will make a fine tuner some day! Wait, that was a total lie.
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Old 11-27-2009, 09:51 PM   #21
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.....

Last edited by Haelan; 11-28-2009 at 08:11 PM.
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Old 11-27-2009, 10:02 PM   #22
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Quote:
Originally Posted by Haelan View Post
I have zero interest in becoming a tuner--professionally or otherwise.
I will sleep soundly knowing that tonight.

Don't become a mechanic either.
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Old 11-27-2009, 10:09 PM   #23
Haelan
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Quote:
Originally Posted by Chi_San View Post
I will sleep soundly knowing that tonight.

Don't become a mechanic either.
No problem. I don't plan on cutting my salary by 2/3.
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Old 11-28-2009, 06:34 PM   #24
JSidik
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When I rebuilt my motor I tied off all the air lines with zip ties, and there should be no leaks. Are there any other ways to check for leaks. By the way, having the motor out for 2 months kept me from reading my codes. Thank you for the apology Haelan, and your input earlier.
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Old 11-28-2009, 06:55 PM   #25
CKxx
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Your BOV sounds lame
93 RX7+09 Forester

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[edited]

Last edited by CKxx; 11-28-2009 at 08:22 PM. Reason: Me being a jerk.
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