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Old 05-11-2009, 12:39 AM   #1
97 Pimpreza
Scooby Specialist
Member#: 123693
Join Date: Aug 2006
Chapter/Region: NESIC
Location: charlton, ma
2004 Impreza WRX

Default Do I need engine management?

Ok, so I just purchased a 96 impreza the other day which has a bunch of work done to it and I am having a very problem with the idle. It idles very rough and if I put it into neutral it stalls almost instantly. The car has a lightweight pulley and flywheel, a unknown brand cat back custom headers and a few other power modifications so I believe the cause for the stalling and rough idle is a lack of engine management causing the air/fuel ratio to be off. Do you think I just need engine management?

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Old 05-11-2009, 02:27 AM   #2
Scooby Guru
Member#: 71092
Join Date: Sep 2004
Chapter/Region: MWSOC
Location: Delaware County, Ohio
2005 2.5RS Wagon
Regal Blue Pearl



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Old 05-11-2009, 03:10 AM   #3
Scooby Newbie
Member#: 73609
Join Date: Nov 2004
Chapter/Region: International
Location: Johannesburg South Africa
2002 wrx


just lift the idle speed at the throttle butterfly with the little screw and nut combo - one or two turns will be all that you need

why overcomplicate things ?
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Old 05-11-2009, 08:11 PM   #4
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Member#: 54702
Join Date: Feb 2004
Chapter/Region: MWSOC
Location: Chicago area
2000 impreza 2.5rs


check for vaccum leaks and/or loose sensors.
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Old 05-12-2009, 02:20 PM   #5
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Member#: 209963
Join Date: Apr 2009

If he has a poor idle and a functioning IAC he needs to solve the problem, not mess up the TB calibration. Subbies use a fully closed TB with near 0 flow so the IAC is designed to do all the metering. If you have a poor idle you need a tuneup. Going to an aftermarket controller to fix a leak or a bad sensor is dumb. Even if you can fix the problem with a mapping tweak the real issue still exists and is going to need fixing. Never put an aftermarket ECU on a poorly running car unless you know why it is running poorly (you changed something) you will waste time and money and tuning will be a huge hassle. Get it right then hot it up.
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