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Old 01-20-2017, 06:44 PM   #1
car_freak85
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Default EJ20G Mid-life Maintenance?

You may have seen Unabomber's Midlife Maintenance thread, and since I'm about to be the proud new Papa to a V3 WRX-RA engine, I was wondering what sort of maintenance issues these early EJ20T engines have compared to the Phase 2 versions.

For example: The front o2 sensor and MAF sensor are critical to be replaced on higher mileage EJ205s due to creeping calibrations. Do the EJ20G sensors also have this issue?

What sort of maintenance parts crossover between the two phases of engines? I know water pumps are identical, how about spark plugs, head gaskets, exhaust manifolds/crossover pipes, etc?
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Old 01-23-2017, 12:01 PM   #2
car_freak85
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Does anyone have, or can provide links to, a GC-body parts catalog? Got some maintenance to do and if the parts interchange with USDM, I can just go to my dealer...
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Old 01-23-2017, 06:12 PM   #3
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Old 01-23-2017, 08:09 PM   #4
elislider
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one of the stickied threads is all about EJ20K part numbers.
If you have a specific list of parts we can try to help you figure out how to find the parts.
The EJ20K is very similar to the USDM EJ205D from the 98 2.5RS, 98 Forester, 97-99 Legacy Outback/GT 2.5
- so things like timing belt, timing covers, valve cover gaskets, plug wires, knock sensor, etc.
- the MAF is a specific JDM only orange label.
- water pump and spark plugs are same as EJ205 usdm wrx
- O2 sensor should have an easy to find crossreference which I can look up if you care
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Old 01-25-2017, 01:00 PM   #5
car_freak85
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Quote:
Originally Posted by yap View Post
I completely forgot about Opposed Forces! Turns out the rear diff stub shaft seals are the same part number as a bugeye WRX, but the trans rear main seal is not.
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Old 01-25-2017, 07:22 PM   #6
elislider
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Quote:
Originally Posted by car_freak85 View Post
I completely forgot about Opposed Forces! Turns out the rear diff stub shaft seals are the same part number as a bugeye WRX, but the trans rear main seal is not.
probably because an EJ20k transmission is phase 1 and a bugeye wrx uses a phase 2 transmission
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Old 01-28-2017, 12:40 PM   #7
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Getting a new OEM MAF on my EJ20g made a big difference for me. Swapping to a used one didn't help, but new OEM has been running very nicely for a year now. I had been swapping crank angle sensors and burning O2 sensors and now it's stable with the new MAF.
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Old 01-30-2017, 03:22 PM   #8
car_freak85
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Quote:
Originally Posted by CRX7 View Post
Getting a new OEM MAF on my EJ20g made a big difference for me. Swapping to a used one didn't help, but new OEM has been running very nicely for a year now. I had been swapping crank angle sensors and burning O2 sensors and now it's stable with the new MAF.
Where'd you order that from and what was the cost? AFAIK the MAF isn't compatible with any USDM model.

Also, if I DO end up going with the ESL daughterboard in my ECU, I have the option to go MAF-less... Decisions, decisions...
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Old 01-30-2017, 07:47 PM   #9
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The v1/v2 EJ20G uses the same green label maf as a lot of USDM models, IIRC.
The v3/v4 EJ20K uses the orange label MAF which is hard to find and you would not want to buy a new one ($300+ from Japan). I see them pop up on ebay occasionally
here's a couple:
(broken and still $200...???)
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Old 01-30-2017, 10:38 PM   #10
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[quote=elislider;44946894]
The v3/v4 EJ20K uses the orange label MAF which is hard to find and you would not want to buy a new one ($300+ from Japan). I see them pop up on ebay occasionally

You could try Trademe in New Zealand, as there can be a few floating round.
http://www.trademe.co.nz/motors/car-...1250003323.htm

As well as a few wreckers selling parts from cars on Trademe, just need to email and ask.
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Old 01-31-2017, 03:04 PM   #11
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Ahhhh, well I have a V1 Type-RA engine, so I will look up the MAF part number tonight!
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Old 02-01-2017, 04:52 PM   #12
91 RS RA
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Quote:
Originally Posted by car_freak85 View Post
Ahhhh, well I have a V1 Type-RA engine, so I will look up the MAF part number tonight!
So you would need a Green AFM?
I have done a quick estimate on shipping an AFM and its around about $20 -25USD
Let me know the part number and I can see what I can get over here and let you know the price.
Looks like it could be cheaper, as long as they used the same AFM's in the JDM and USDM cars (can't see why they wouldn't)
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Old 05-02-2017, 03:32 PM   #13
car_freak85
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Quote:
Originally Posted by 91 RS RA View Post
So you would need a Green AFM?
Opposed Forces is giving me these P/Ns for the MAF (Link here):

Complete (w/ housing) - 22680AA301
Sensor only - 22794AA010

Neither of those parts appear to be installed on a USDM model.
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Old 05-07-2017, 01:25 PM   #14
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I have an early 92-96 EJ20G which has the 22680 AA160F MAF

Look on the label and you will see the part number. I just kept searching on ebay by part number and found a new OEM one for $30 somehow.

The EJ20G green label MAF was used on many USDM 90s models.
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Old 05-08-2017, 12:36 PM   #15
car_freak85
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OK, I'll see what the P/N on the actual MAF says. Kind of disappointing that Opposed Forces isn't pulling up the correct P/N, makes you wonder how accurate their database actually is.
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Old 05-09-2017, 05:08 PM   #16
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i would think anything that could make it knock.

change plugs
change out knock sensor
clean maf
replace front o2 sensor
clean oil out the tmic and track
replace PCV valve
inspect turbo oil return hose
check turbo feed banjo for clogged screen if equipped
pretty sure those had a check valve behind IACV motor, make sure thats clean
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Old 05-17-2017, 01:23 PM   #17
car_freak85
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Yeowza, that 22680AA160 green MAF is EXPENSIVE! $345 +/- from the dealer!
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Old 05-18-2017, 12:32 AM   #18
91 RS RA
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Try this site for a Green AFM
http://www.trademe.co.nz/motors/car-...1328011310.htm

$195 NZD ($135 USD) + shipping.
Would make it a lot cheaper than $345
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Old 05-18-2017, 02:42 PM   #19
car_freak85
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Quote:
Originally Posted by 91 RS RA View Post
Try this site for a Green AFM
http://www.trademe.co.nz/motors/car-...1328011310.htm

$195 NZD ($135 USD) + shipping.
Would make it a lot cheaper than $345
Thanks! I'll look into that this evening.
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Old 05-18-2017, 11:08 PM   #20
91 RS RA
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Quote:
Originally Posted by car_freak85 View Post
Thanks! I'll look into that this evening.
Let me know if you need any help this end.
Always happy to help out a fellow Subaru owner.
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Old 07-13-2017, 03:13 PM   #21
car_freak85
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I finally found a new MAF and oxygen sensor on ebay for $75 and $65 respectively, with free shipping on both! Saved a good $400+ USD right there.
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