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Old 01-12-2005, 09:43 AM   #1
Scooby Newbie
Member#: 55515
Join Date: Feb 2004
Location: Canberra ACT Australia
1998 MY99

Default Rough Idle on 2.5 Short Motor

Has any one experienced rough idle with a 2.5 short motor?
This one is bolted up to Version 6 STi Heads and is only running low boost during its run in. Original Version 6 STi 440cc injectors and a VF28 all in need of upgrade one day but this should not impact on the idle? Any thoughts appreciated.
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my99maddog is offline   Reply With Quote
Old 01-12-2005, 10:26 AM   #2
Scooby Guru
Member#: 8343
Join Date: Jul 2001
Chapter/Region: MWSOC
Location: Atlanta, GA
2005 2012 Jeep
2013 DGM BRZ


Didn't notice an idle difference when I switched to one. Vacuum leak somewhere maybe?
dwx is offline   Reply With Quote
Old 01-12-2005, 04:50 PM   #3
Scooby Newbie
Member#: 926
Join Date: Feb 2000
Chapter/Region: South East
Location: Raleigh, NC, USA

my idle is the same.
ditto ont eh vacuum leak check suggestion. You can use a propane torch and dont light it, jsut move it around the engine bay near everything like where the manifold mounts to teh heads and see if your idle changes. I have heard people use water too, and you can hear it, but Id rather keep the motor dry since the next step is wrenching on it.
jdchmiel is offline   Reply With Quote

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