Do I need engine management? - Subaru Impreza GC8 & RS Forum & Community: RS25.com

narus_l · 05-10-2009, 09:25 PM

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?

cloudconnects · 05-11-2009, 02:22 AM

i think its from the lightweight pully and flywheel... someone else who knows will chime in

freeride · 05-11-2009, 03:12 AM

I doubt you need EM but is there any CEL's?

The fly and pulley shouldn't make your car stall or idle bad, is it an automatic?
O2 sensor can cause that.

Storm · 05-11-2009, 03:23 AM

Sounds like a vacuum leak to me. Do a thorough inspection of all the hoses and pipes in the engine bay. Engine management won't do anything if the basic systems are not functioning properly.

narus_l · 05-11-2009, 07:02 AM

Its a 5-speed and there are no CEL's

narus_l · 05-11-2009, 07:03 AM

is there anything I can physically do to raise the idle speed?

ride4life32 · 05-11-2009, 07:19 AM

You should look at your IACV Idle Air Controll Valve...check/replace the gasket and clean the valve (use gas or alchohol to clean it very good then slap it back on) It is located right next to the throttle body. Its a cheap fix possibly if you find out its not due to a vacuum leak somehwere in your system.

Monster · 05-12-2009, 02:14 AM

spray some accelerant around the intake manifold area like brake clean around a suspected vacuum leak should pinpoint where the leak is

05-10-2009, 09:25 PM	#1 (permalink)
narus_l 1.8L My: Subaru Parts Join Date: Oct 2008 Trader Rating: (0) Posts: 16	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?

05-11-2009, 02:22 AM	#2 (permalink)
cloudconnects 3.3L Car: 00 2.5RS White 5MT R.I.P. Fav Mod: Amber Corners My: Subaru Parts Join Date: Aug 2008 Location: Edmonton Trader Rating: (0) Posts: 722	i think its from the lightweight pully and flywheel... someone else who knows will chime in __________________ Totaled

05-11-2009, 03:12 AM	#3 (permalink)
freeride 2.0L Turbo Car: 2000 2.5 RS-T srp sedan Fav Mod: booost My: Subaru Parts My: Subaru Blog Join Date: Dec 2004 Location: S.Ontario Trader Rating: (2) Posts: 1,781	I doubt you need EM but is there any CEL's? The fly and pulley shouldn't make your car stall or idle bad, is it an automatic? O2 sensor can cause that. __________________ 2000 SRP RS-T, 97 2.2 Impreza Wagon, 05 xt Forester! toronto-subaru-club.com

05-11-2009, 03:23 AM	#4 (permalink)
Storm 2.5L RS-T My: Subaru Parts Join Date: Dec 2001 Location: NE Ohio Trader Rating: (20) Posts: 5,849	Sounds like a vacuum leak to me. Do a thorough inspection of all the hoses and pipes in the engine bay. Engine management won't do anything if the basic systems are not functioning properly. __________________ Jay Storm

05-11-2009, 07:19 AM	#7 (permalink)
ride4life32 2.2L Turbo Car: 93 Imperza L Ameythst Fav Mod: Engine My: Subaru Parts Join Date: Jun 2006 Location: Indiana Trader Rating: (6) Posts: 2,825	You should look at your IACV Idle Air Controll Valve...check/replace the gasket and clean the valve (use gas or alchohol to clean it very good then slap it back on) It is located right next to the throttle body. Its a cheap fix possibly if you find out its not due to a vacuum leak somehwere in your system. __________________ http://dragon.ycp.edu/~astowell/stig.html

05-11-2009, 07:02 AM	#5 (permalink)
narus_l 1.8L My: Subaru Parts Join Date: Oct 2008 Trader Rating: (0) Posts: 16	Its a 5-speed and there are no CEL's

05-11-2009, 07:03 AM	#6 (permalink)
narus_l 1.8L My: Subaru Parts Join Date: Oct 2008 Trader Rating: (0) Posts: 16	is there anything I can physically do to raise the idle speed?

05-12-2009, 02:14 AM	#8 (permalink)
Monster 2.0L Turbo Car: MY00 //// BRP 2.5RS coupe Fav Mod: Prodrive goodies =D My: Subaru Parts My: Subaru Blog Join Date: Mar 2008 Location: SF, CA Trader Rating: (6) Posts: 1,753	spray some accelerant around the intake manifold area like brake clean around a suspected vacuum leak should pinpoint where the leak is __________________ Ninja? Photos!

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