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(Beginning of) comprehensive guide to EJ22 differences among model years.
Posted 10 December 2012 - 06:09 PM
In other words, let my struggles be of some help to others.
1999 Subaru Impreza 2.2:
Uses different piston rings than previous EJ22s. 1.2/1.2/2.5 as opposed to the standard of 1.2/1.5/3.0 for the ring width. See; Hastings 2C5167. I got mine from RetroRoo (ShawnW)
Timing belt tooth count is +3 over standard phase 1 EJ22: 47 passenger cam to crank, 43.5 crank to driver cam. Standard is 44/40.5.
Uses SOHC 2.5 valve cover and intake manifold gaskets.
Uses hotter plug (OEM spec) than earlier EJ22: BKR5E11 NGK
Posted 20 December 2013 - 08:25 AM
1995: Dual port exhaust manifold
1996-2001: Single port exhaust manifold
1990-1996 has old style tensioner
1997 is usually new style tensioner in the ones I've seen.
1998+ is new style tensioner
1995: Automatics have EGR, manuals do not
1996-1998: EGR is variable, I've seen auto EJ22's with and without EGR
1999-2001 Phase II's are very different from Phase I EJ22's.
Could possibly list the few things that are the same amongst Phase I and Phase II EJ22s:
Oil pump, water pump, timing pulleys, timing tensioner
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