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Old 11-15-2012, 09:24 AM   #4
gdoggmoney
Scooby Newbie
 
Member#: 158150
Join Date: Sep 2007
Chapter/Region: MAIC
Location: some place
Vehicle:
2007 Impreza 2.5i
Newport Blue pearl

Default

Some other things that rid me of misfires an idle/stumbles: Fuel injector seals & intake manifold gaskets. They just sort of shrivel up and decay at higher mileages from heat cycles.

It seems subaru moved to a cheaper fuel injector seal that only seals against 1 surface, vs the originals that sealed against 2 on the injector tip/face. This required slightly crushing the fuel rail to get a positive seal against vacuum (boo subaru)

While there i added some grimspeed 8mm phenolic spacers, removed the coolant feed to the throttle body and completely removed the EGR system.

Then the NGK BKR5EIX-11's seemed to do better than any other plug I stuffed into the car. Last forever and worth the price.
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