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Old 01-17-2018, 01:17 AM   #1
Scooby Newbie
Member#: 384907
Join Date: Mar 2014
Default EJ205 swap problems, tune/acvs/timing?

Swapped in a JDM EJ205 with ACVS to replace the bad EJ255 in my 06 baja turbo. I used intake and harness from the EJ255 on the EJ205 as well as the original USDM ECU. After the swap the engine was slow/hard to start but it started and ran. It soon gave codes for camshaft position sensor as the JDM cams aren't compatible. It had some misfire from 2 cylinders and the engine was in "Limp Mode" with very little boost. Disconnecting the vacum lines from the wastegate actuator the engine would pull very strongly until fuel cut due to excess boost and it would surge. Reset codes a number of times, changed out coils, disconnected and reconected ACVS with no change to cars running an limp mode. Car became more difficult to start. ........Downloaded tune and switched off camshaft position warnings in tune and reflashed. Car still very difficult to start and now won't start. Downloaded tune and zeroed out the ACVS advance to in effect stop ACVS function. Engine now won't start at all.......It is getting fuel, but it is as if it isn't firing................I have only 1 Idea: Iginition get's timing signal from camshaft position sensors which are not functioning properly with the JDM camshafts. After shutting down ACVS, it is not firing at the proper time. After resetting and reflashing the ECU a number of times it no longer "remembers" when to fire without signal from camshaft sensors???

Any Ideas anyone?
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Old 01-17-2018, 09:12 AM   #2
Scooby Specialist
Member#: 182415
Join Date: Jun 2008
Chapter/Region: Tri-State
Location: New York
1999 RS
Aspen White


The US ECU will not work with the JDM cam signals, period, and your work around to make the car run and drive is a bad idea, you can easily damage the motor. AVCS wont work because the cam signal isnt correct.
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Old 01-17-2018, 04:27 PM   #3
Scooby Newbie
Member#: 384907
Join Date: Mar 2014

Thankyou for replying to my quote. I have done alot of research on this thing. I read a thread about another person with the ACVS incompatability problem: Metal bumps on JDM cam do not line up/work with the USDM sensor the same as with the USDM camshaft. His fix was to install USDM cams and the sensors slightly to align.
I want to simply not use the ACVS. I want fixed valve timing. Reading through threads it seems that alot of people have done a swap and are not using ACVS.
Problem I'm having now is engine is either not firing or not firing at the right time. I'm wondering where the timing signal for the ignition on this engine comes from.
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