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Old Yesterday, 08:31 AM   #1
Scooby Newbie
Member#: 465153
Join Date: Mar 2017
Default EJ20 Idle drop

I am facing idle problem with my EJ20.

At cold idle running fine and when engine arrives at working temperature it started to fluctuate. Temp sensor good. When driving and stop at a stop light the RPM drop down completely to 0 and instantly increase to 750. Sometimes when it drops the engine switches off.

Then after the performance of the engine deteriorates, it started to misfires between 2000 and 3000 rpm intermittently.

Could you please help?
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Old Yesterday, 10:13 AM   #2
Scooby Specialist
Member#: 279525
Join Date: Apr 2011
Location: QUEENS NY
04 rex luger!


Try cleaning out your IACV (idle air control valve). It sits right on top of your intake manifold.

It may be gunked up and just needs cleaning.

Before you do this job, you absolutely need a new IACV gasket on hand as YOU WILL NOT be able to re-use the old one.
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Old Yesterday, 10:35 AM   #3
Scooby Newbie
Member#: 87587
Join Date: May 2005
2002 wrx


also could try cleaning all the engine grounds. I did this last night for ****s and giggles when i had the TMIC off and wow, it made a massive difference. Scuff each ground point with a little sandpaper and reattach. There are a ton of grounding points in the engine bay and the wrx is notorious for bad grounds.
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