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Old 09-06-2013, 01:45 PM   #1
Scooby Newbie
Member#: 361044
Join Date: Jun 2013
Chapter/Region: E. Canada
Location: Nova Scotia, Canada
1998 STI V4 RA V-Ltd

Default 98 wrx sti - rough idle (video inside)

Hi everyone. As the title states I'm having an issue with the subie. I did check around for similar threads and while there are plenty of people with idling issues most (all that I seen) were due to the cold.

My idling is dipping down, picking back up, and repeating this cycle back and forth and only happening intermittently.

This video was taken after about a 25 minute drive. It was mostly highway driving and only came on boost a few times and probably only went about 3/4 throttle at most the entire time. At the time of recording the car was in neutral, and parked in my underground garage.

You can clearly see the problem between 0:15-0:25. From there until around 0:30 I was revving it up a bit to see if it would make it stop. Around 0:58 it began again, and this time I showed you how the rough idle was affecting the vacuum reading on the turbo timer.

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Last edited by Version4Owner; 09-06-2013 at 01:51 PM.
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Old 09-06-2013, 04:42 PM   #2
Scooby Specialist
Member#: 128022
Join Date: Oct 2006
Chapter/Region: Tri-State
Location: Danbury, CT
2015 Mustang GT


looks like a vacuum leak. Boost leak test should find it.
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