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Old 01-10-2009, 11:00 PM   #1
sniper512
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Default O2 and MAF Replacement?

Are there any NA cars that I can use as a donor for the MAF and O2 sensors for my JDM EJ20G V1? Or does anyone have the part numbers for these parts?
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Old 01-11-2009, 01:37 AM   #2
suberdave
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well for the O2 Sensor, just go to any parts store and get a universal 3 wire O2 sensor, i have the Bosch part number somewhere.

as for the MAF, i can get part numbers tomorrow. but i do know that my 93 2.2l NA legacy has the same part number MAF...

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Old 01-11-2009, 03:20 AM   #3
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Any early (~'92-'96) Subaru with the black plastic MAF is the same unit.
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Old 01-11-2009, 11:47 AM   #4
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Good to hear I'll look into the MAF sensor today and pick up an O2. I am having poor acceleration above 3000rpm, but I am still building full boost. It almost feels like the car is pulling timing. I ordered new coils and am doing the 02+ WRX conversion as well. I found 2 cracked coils when inspecting them. It feels like there is more than just breakup going on to me. Spark plugs are new and gapped down to .028. Also I am feeling lots of misfires at idle as well.

So a NA 93 Legacy 2.2T has the same number?
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Old 01-13-2009, 12:50 AM   #5
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So I did the 02+ coil conversion toady. There are no more misfires at idle and the car is more responsive, but there is still some moments when you give it full throttle and the car seems to not have much power other time you punch it and it pull really hard. Any ideas what else this could be? I have been driving around for about an hour and it seems to be getting better, but the issue is still there.
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Old 01-13-2009, 03:00 AM   #6
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I dont know what ecu you are using... but if you are using the jdm ecu, you might be having problems with the octane of gas you are using. The jdm ecu's are very aggressive as far as timing and are designed to run higher octane. It will pull timing and add fuel to protect the engine if it detects knock.
This may not be your problem... but this is a normal function of the jdm ecu's if knock is present.
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Old 01-13-2009, 10:12 AM   #7
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The car is a JDM so ya its in there. I am running 94 octane though but I see your point. Thing is my buddy has the same car as mine with no problems like this and he uses 91 octane. gc8awdsti mentioned that it could be a boost leak of some kind in another post. I am wondering myself maybe the recirc valve. Its either that or its retarding the timing. Could a bad knock sensor cause this with no code? or the the MAF or O2?
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Old 01-13-2009, 10:18 AM   #8
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The MAF is the AA160 MAF.
For the O2 sensor you can use the sensor for any of the OBD-I USDM NA cars that only use one O2 sensor. It's the same plug and the wiring is long enough to reach down to the header pipe where they put the O2 sensor on the JDM cars.

As for the ECU and fuel? If I am reading correctly, you've got a standard early Ej20G swap. It's really only the more aggressive STi and RA versions that seem to pose a problem. You almost never hear of problems with the Z4 or wagon ECUs. It's almost always a 6k, SA or SC ecu that causes problems because of their aggressive timing.
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Old 01-13-2009, 10:45 AM   #9
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I actually have a RHD 93 JDM WRX no swap. I checked, it has a U8 ECU in it. My stock boost is right around 11psi. When the car has power loss you can hear spooling and air rushing noise much louder than normal but it still builds full boost just as normal. The power loss is random it seems. I did notice that if I reset the ECU I do have a few mins of no issues. I wonder if it is the timing being retarded and resetting the ECU allows full power till it figures everything out again? Thanks for the part number for the MAF.
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Old 01-13-2009, 11:33 AM   #10
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Quote:
Originally Posted by Matt Monson View Post
As for the ECU and fuel? If I am reading correctly, you've got a standard early Ej20G swap. It's really only the more aggressive STi and RA versions that seem to pose a problem. You almost never hear of problems with the Z4 or wagon ECUs. It's almost always a 6k, SA or SC ecu that causes problems because of their aggressive timing.
Small correction, the SC ECU is exactly the same as the Z4. I can't comment on the SA since I haven't had a chance to look at that ROM image yet....cough cough......
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Old 01-13-2009, 03:56 PM   #11
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Check the hoses between the turbo/IC and the coupler between the IC and the throttle body, I had the same symptoms pop up a couple of days ago. It would build full boost, but there was a lot more lag and even at 17psi, it really didn't feel like it was pulling like it should. I got a look at it yesterday and a silcone hose I had between the turbo and IC had a tear in it... got brittle and cracked I guess. I put a new hose on and it's a day and night difference.
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Old 01-13-2009, 05:12 PM   #12
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Quote:
Originally Posted by rob View Post
Small correction, the SC ECU is exactly the same as the Z4. I can't comment on the SA since I haven't had a chance to look at that ROM image yet....cough cough......
Maybe you need to find someone who has one of those that you can dump data from.
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Old 01-13-2009, 06:36 PM   #13
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Quote:
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Maybe you need to find someone who has one of those that you can dump data from.
Easy in theory, but in practice is has been a bit of a PITA
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Old 01-13-2009, 07:13 PM   #14
Matt Monson
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Let's see if we can put something into play here...
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Old 01-13-2009, 07:28 PM   #15
sniper512
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I will have a look at the lower turbo to IC hose. I had the IC off a couple times and never noticed a tear or hole in the main hose. I replaced the short coupler from the IC to TB with a Samco piece already.

Does any one know what Knock sensor to use?
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Old 01-13-2009, 09:51 PM   #16
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Quote:
Originally Posted by sniper512 View Post
Does any one know what Knock sensor to use?
Should be the same as any first gen Legacy ('90-'94), and most likely the same as later models also.

I'm sure Matt or others can narrow it to science.
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Old 01-13-2009, 10:20 PM   #17
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Thanks. I just want to start with the cheapest and work my way up lol. I am hoping it is something simple. I can just be so many things. I may get a FMIC to get rid of all the likely boost leak areas.
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Old 01-14-2009, 08:56 PM   #18
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So I pulled my IC tonight and check it over and pressure tested it and the plumbing from the turbo to IC and there were no leaks. Is there a way to test the recirc valve?

Also is there any test that I can perform on the sensors? Knock, MAP, MAF, TPS, IAC? Is there a way to get codes from my ECU?
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Old 01-15-2009, 10:03 AM   #19
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The JDM cars use the exact same diagnostic protocols as the US cars. You should have both the green and black connectors under the dash and be able to use them just like you would on a US car to pull codes and run the car through a systems check.
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Old 01-15-2009, 10:30 AM   #20
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Awesome so its just a series of blinks like flash-pause-flash-flash would be 12?
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Old 01-15-2009, 10:50 AM   #21
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yep. And since it's a standard protocol it's the same codes used to designate the same problems whether it's a JDM or USDM ECU.
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Old 01-15-2009, 06:50 PM   #22
sniper512
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Okay so whats the procedure to pull codes? I have both the green and black single pin plugs under there. I am also going to replace the knock sensor tomorrow. I think I found it just under the intake manifold on the drivers side towards the back of the motor. It has a single wire running to it and has a bolt through the center and rubber around it?
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Old 01-15-2009, 07:26 PM   #23
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plug the single pin black connectors together ,and turn ignition on. then count the flash's long flashs are 10 short are 1 3long 2 short would be o2 sensor . 2long 2 short knock sensor.
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Old 01-15-2009, 08:14 PM   #24
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Okay tried it all it does is flash continually does that mean there are no codes?
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Old 01-15-2009, 08:28 PM   #25
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Means no codes.
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