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Old 10-09-2017, 08:38 AM   #1
beaviscih
Scooby Specialist
 
Member#: 123362
Join Date: Aug 2006
Chapter/Region: MWSOC
Location: Dorothy's House
Vehicle:
'93 Crapcan EJ22
FTW

Default EJ18 to EJ22 Lean AFRs

Background: '93 Impreza track car with a '97 EJ22 swap.
Problem: Lean AFRs at idle (15-17).

Swap Details:
After two EJ25D swaps into the '93 failed I've switched back to a EJ22 from a '97 Impreza.

Previously I have swapped a Phase I EJ22 in place of the '93 EJ18 and had no problems running the stock EJ18 ECU. We ran the Phase I EJ22 for several years with no issues.

After swapping the '97 EJ22 I am seeing lean AFRs at idle. The car idles smooth but a little high (1300 RPM). Thinking the AFR sensor may be bad I changed the sensor, but the same result - lean at idle.

For the EJ25D swaps I used a Haltech ECU tuned specifically for the EJ25D swap. For the EJ22 swap, I'm back to the stock EJ18 ECU. Knowing the Haltech tune for the EJ25D would be rich I wanted to make sure it wasn't a vacuum leak or something else so I plugged in the Haltech and sure enough the car runs pig rich at idle. Mid 12's on the AFR gauge.

'97 EJ22 Swap Details:
'97 long block (except for the coolant cross-over pipe which is from a Phase I engine).
New head gaskets with ARP head studs.
Valve lash checked and adjusted.
Freshly cleaned grey top injectors. The part numbers for the '93 EJ18 and '97 EJ22 injectors are the same.
'93 Engine harness with all emission sensor's deleted.
'93 EJ18 coolant sensors.
'93 throttle body, TPS and IAC valve.
'97 timing components and sensors.
'93 MAF (although the '97 is the same part number so I tried both).
Aftermarket oil cooler.

Any thoughts or tips what to check next would be appreciated.
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Old 10-13-2017, 08:55 PM   #2
ReubenH
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Member#: 172522
Join Date: Feb 2008
Chapter/Region: International
Location: Queenstown, New Zealand
Vehicle:
1998 Legacy GTB Ltd.
Black

Default

I would go back to the haltec and get it tuned. I find it funny that the US 2.2's have they white injectors.(i call the turbo injectors for EJ20G's grey, they are darker than the EJ18 injectors)

With the JDM setups, early EJ20E's here had red's, as on the EJ25's, and so did the 2.2's. Whites only showed up on the EJ20E for version 3 impreza's from 1996 onwards, EJ22's were discontinued in the legacy by this time in japan. EJ20D and EJ25D still ran reds though

Is it possible the whites are maxing out? I would not have thought that though. Usually the MAF based cars can handle this sorta difference.. I can't tell you how many EJ20E's, EJ20D's and EJ22E's i've slapped in 2.5L outbacks and 250T's, and they've run just fine (the EJ20D's are the worst to convert, they lose all their bottom end torque when ran on a 25D ECU. The SOHC's work great though)
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Old 10-15-2017, 08:59 PM   #3
beaviscih
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Member#: 123362
Join Date: Aug 2006
Chapter/Region: MWSOC
Location: Dorothy's House
Vehicle:
'93 Crapcan EJ22
FTW

Default

Thanks for the reply. I actually found that the front O2 sensor had a severed wire and wasn't working. The sensor had been plugged in while using the Haltech (which was tuned by MAP) that didn't use the oxygen sensor. I installed a new sensor and the AFRs are around 14.1 at idle.

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Old 10-17-2017, 11:25 PM   #4
turboL
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Member#: 111735
Join Date: Apr 2006
Chapter/Region: South East
Location: Chicago
Vehicle:
97 Impreza L
Rust and White

Default

So fixed? 14 at idle doesn’t seem far off. No way are any injectors being maxed out at idle.
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