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Old 09-07-2012, 01:34 PM   #2
Scooby Newbie
Member#: 257043
Join Date: Sep 2010
Chapter/Region: VIC
Location: Vancouver BC
1993 JDM WRX Wagon


So many possibilities, Here's a few to look at:

Plugs or Coilpacks especially if it has the JDM EJ20G coilpacks instead of the coilpack upgrade.
Bad Coolant temp sensor; effects coldstart and idle.
Epic filth in the coolant line running into your IACV; Remove lines and use brakecleaner to clean that the crap out of the line. It uses a sensor as well and when clogged with garbage it will effect coldstart and idle.

Weak signal from the Crank position sensor. effects startup. Test by removing and cleaning sensor if it gets better you know that the sensor is weak. Replace it.
Weak pressure from a bad fpr; what is your actual fuel pressure at startup?
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TommyAtomic is offline   Reply With Quote