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Old 07-06-2022, 07:07 PM   #1
Bolt-on
Scooby Newbie
 
Member#: 104832
Join Date: Jan 2006
Location: Lander, Wyoming
Vehicle:
05 STi
CGM

Default 2002 JDM EJ207 swap starts won't rev - Solved!

I'm putting a JDM V7 2002 STi engine in a Factory Five 818R kit car. The engine is cable throttle, AVCS, no TGV factory intake.

I pruned what was probably a 2002 WRX chassis harness to fit the 818. The JDM engine came with engine harness only and a B1 code ECU from a 2005 immobilized STi. (I figured this out when it wouldn't start thanks to iWire!) I bought a JDM V7 ECU on ebay, code V8.

I have had to re-pin the WRX ecu connectors for the main relay, fuel control, and intake air temp sensor, and add pins and wires for the AVCS rear cam sensors and solenoids. I have printed out several wiring diagrams. The JDM harness closely matches one for a 2005 STi, and doesn't match the others.

I can read OBD codes but not monitor functions. I have one O2 sensor code P0037, probably because I don't have a rear O2 sensor.

It starts right up on all cylinders and has a low surging idle, barely running. It will not rev but dies with throttle.

I have hundreds of hours into just the wiring.

I tried to connect a Tactrix cable but my computer isn't doing it. I have had great success on other projects with Megasquirt. I'm wondering if I should go that way or keep trying with the Subaru ECU.

I may have missed an important ECU pin. The ebay ECU may be bad or tuned for a different car. I checked for vacuum leaks. Fuel pressure is good. All cylinders fire smoothly.

I'd appreciate any suggestions!
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Last edited by Bolt-on; 07-07-2022 at 07:08 PM.
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Old 07-07-2022, 04:20 PM   #2
Bolt-on
Scooby Newbie
 
Member#: 104832
Join Date: Jan 2006
Location: Lander, Wyoming
Vehicle:
05 STi
CGM

Default

I unplugged the MAF and it runs. Now I need to figure out what that means.
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Old 07-07-2022, 07:07 PM   #3
Bolt-on
Scooby Newbie
 
Member#: 104832
Join Date: Jan 2006
Location: Lander, Wyoming
Vehicle:
05 STi
CGM

Default

Solved. I installed the MAF sensor backwards. Turned the intake pipe around and it runs like a champ!
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Old 07-08-2022, 07:18 PM   #4
NordyPi
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Member#: 530559
Join Date: Jun 2022
Chapter/Region: RMIC
Location: Grew up in Missoula, MT
Vehicle:
2002 WRX Wagon
WRB

Default

Quote:
Originally Posted by Bolt-on View Post
Solved. I installed the MAF sensor backwards. Turned the intake pipe around and it runs like a champ!
That must have been scary. Glad the fix was easy, even if it was stressful at first?
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