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Old 01-20-2006, 01:42 PM   #1
Scooby Specialist
Member#: 90003
Join Date: Jun 2005
Chapter/Region: MWSOC
Location: Rochester, PA
2005 STi

Default 1.8->2.2 rich @ idle question

hey guys, i know there's prob no answer to this but i thought id throw it out there anyway just to see...

I have completed (after a few months of tweaking and chacing random crap) a '95% of the time' CEL free 1.8->2.2 swap w/ WRX catback getting about 27-28 highway mpg. HOWEVER... around town, to work through back roads, etc im back to crappy 20 mpg and the idle is sooo rich that it bogs heavily until ~2000 rpm. and forget about tryin to roll stop signs in 2nd cuz the bog is terrible and shakes the car

I have noticed though that it only seems to do this when hot, for example:
last friday i get up, i hop in the car and take off no probs, no bogging, no shaking, nothing different from a stock car. then i drive 2 hrs to Stratton to ski. I finish skiing, get in the car and its of course cold so its perfectly fine. Drive another 2hrs home and get an amazing 28 mpg. I continue to drop off my friend at his house. as im pullin from his driveway, my car is sputting, shuddering and bogging all over the place. stop signs are my worst enemy at this point for driving smoothly. and again i notice this is all before 2000 rpms.

I know the 1.8 ECU has alot to do w/ this but i just want to see if theres a possibility that anyone around here has heard of or has any ideas of what to do. So far, dealing w/ it is the best option i know. this might not even be a fuel prob, maybe timing???

any ideas would be great cuz if i could do something about this i would have an awesome NA swap running great
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Old 01-20-2006, 01:48 PM   #2
Matt Monson
Scooby Guru
Member#: 832
Join Date: Jan 2000
Chapter/Region: RMIC
Location: Teh Ghetto Garage, CO
99 2.5RS, '85 911
'73 914 and 2012 BRZ


I don't know that this is related to the swap. Unless I am mistaken, Ej18 and Ej22e injectors are the same size. Beyond that, since it is a MAF based car, you should still be fine because it's going to fuel accordingly and as long as you are using the Ej22 injectors there shouldn't be a problem.

There's an Ej22E driven Ej18 car here in Colorado that I helped put together that isn't having those kinds of issues. It did have some injector problems, but replacing with a good used set of stock EJ18 injectors fixed it.
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