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Old 12-03-2011, 07:29 PM   #1
Ghost Hacks
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Member#: 302833
Join Date: Dec 2011
Default JDM EJ20 Help

So I've been looking all over for the best Subaru Forum, and I think this is the place to search. I myself have an 05 Dodge SRT 4 but my bro has a JDM 1997 Subaru Wagon WRX/STI with an EJ20 turbo motor.

So last weekend the motor died on him. It's been running VERY rich, and seems to have a MAF problem, when coming to a stop it starts idling very low, then evens out. Well he drove it pretty far, at least 35 minutes out of town, stopped at a buddy's house, and now it won't start. It's cranking, and it tried to start when he stepped on gas pedal once. We changed out the crank shaft sensor with one from a Euro Legacy non-turbo 2.2L and cleaned the MAF with MAF cleaner but nothing. Any ideas?
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Old 12-03-2011, 08:16 PM   #2
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Member#: 54525
Join Date: Feb 2004
Chapter/Region: MAIC
Location: morgantown wv
2000 00rs 2x91ss 95l
blue ridge pearl


My vote is he probably fouled the plugs. While you're replacing the plugs do a compression test to make sure the timing belt or belt tensioner didn't go. If the tensioner or one of the pulleys starts going it can let the belt slip and ruin the valves. The car will run but it will run like crap and be really hard to start. Ask me how I know
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Old 12-04-2011, 05:49 AM   #3
Ghost Hacks
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Member#: 302833
Join Date: Dec 2011

How do you mean when you say run like crap? His car wasn't knocking or running crappy at all. Just that idle issue when coming to a stop from driving.

I was thinking maybe an 02 sensor could have been making him run really rich also. We will check the plugs out and see if it works.

Where is a place to get JDM parts cheap for these cars, I can't find vendors to save my life.
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Old 12-04-2011, 10:49 AM   #4
Ghost Hacks
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Member#: 302833
Join Date: Dec 2011

Update: Its something with the fuel. He tried to get the car towed, and the road side assistance guy tried spraying fuel in the intake and it tried starting. It was firing when only when giving the spray fuel through the intake. We can hear his fuel pump turn on also, so any ideas where the issue could be? Maybe injectors, but all 4 at the same time?
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Old 12-04-2011, 10:53 AM   #5
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Member#: 199010
Join Date: Jan 2009
Chapter/Region: SCIC
Location: Pinon Hills, CA
2005 WRX


Replace the fuel filter if its never been done... check fuel pressure. Just because the pump turns on doesnt mean its sufficient fuel.
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Old 12-04-2011, 01:05 PM   #6
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Member#: 71627
Join Date: Sep 2004
Chapter/Region: Tri-State
Location: Ny/Nj/Li
180 Wrx/Fozzy/OBS
DGM/DGM/Silver S


Yes check the fuel pressure ,if you cant remove top fuel line,place it in a bottle and turn ignition on,so you can see if fuel is coming out or dirty, fuel pressure regulator can also be the cause so as E-motion said a fuel pressure should be done.
Have you try using a fuel injector cleaner? I got 97 EJ20g complete intake manifold so if you need injectors,or pressure regulator let me know.
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Old 12-04-2011, 05:15 PM   #7
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Member#: 70710
Join Date: Sep 2004
Chapter/Region: Tri-State
Location: Quakertown/AREA1320 391whp
2002 04STi Swaped RS
w/PPGS & 02 Wagon w/PPGs


Could be a vac leak......IAC valve
EGR if its got the older JDM intake manifold
Fuel Pump is going out.....that would be the fuel pressure at idle, but it would be far more present at boost/high RPMs
Spark/Fuel.....check the grounds on either side of the intake manifold, they are for the injectors and coil packs. If its a single coil system check the igniter ground on the fire wall ( its dead center just above the TMIC & pitch mount )
defiantly check compression and vac/boost leak test it and get back to us

Last edited by dangerousatom; 12-04-2011 at 05:21 PM.
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Old 12-09-2011, 07:53 PM   #8
Ghost Hacks
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Member#: 302833
Join Date: Dec 2011

We used the fuel pump out of the 2.2L NA Euro spec motor that he go the crank shaft position sensor out of, and after swapping it out it fired up with a good jump.

But the pump out of the 2.2L was smaller then the one had in before, is there a Walbro 255 kit for the JDM 2.0 Turbo motor?

Also its still trying to die on him when coming to a stop and idling. Any ideas?
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Old 12-09-2011, 09:08 PM   #9
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Join Date: Sep 2007
Chapter/Region: NESIC
Location: Maine
1995 WRX
1998 2.5 RS


The walbro fits every subaru.

You probably have a bad maf, that year is well know for bad mafs. It's the one with the orange label right? Those go bad all the time.
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Old 12-10-2011, 05:31 AM   #10
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Join Date: Nov 2002
Location: Woking, home of Mclaren
1998 Version 4 STI
White, gold wheels


You can run diagnostics and look for any problems that way. http://www.scoobypedia.co.uk/index.p...gECUCodes#toc3
Hopefully that tells you what's wrong.
Otherwise, I would get the Walbro first, as it's relatively cheap and you'll almost certainly need it anyway. Fuel pump from non turbo car may be weak. You may have to cut and crimp a couple of things (I did) but it will fit.
As far as I know the orange maf is one of the best, but if it is the original it is so old that it is likely to have problems. I had to replace one on my car. Don't change it unless you know it is faulty, as they are expensive. They are available new though, so that can be fixed.
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Old 12-14-2011, 12:28 PM   #11
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Member#: 257043
Join Date: Sep 2010
Chapter/Region: VIC
Location: Vancouver BC
1993 JDM WRX Wagon


Alot of people replace their fuel pump instead of replacing their bad FPR because swaping a fuel pump is a 15-20minute job(if you've done it before) and swapping the fpr is a 45-60min job. Upgrades are great but you should probably verify that your fixing the problem not just hiding it.

A Walbro 255 lph will flow enough fuel that unless your fpr is worse then complete junk you can still run the car. Eventually you'll be running the Walbro at 100% cycle for so long that its life cycle will be cut short and you'll need another fuel pump.

Get a fuel pressure guage and check your actual fuel pressure. Verify that your FPR is doing its job. If it is THEN replace the fuel pump.
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Old 12-15-2011, 03:39 PM   #12
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Member#: 300591
Join Date: Nov 2011

You could check and clean the iacv because when that gets dirty it causes very similar problems and it is a common occurrence on the ej20g. Symptoms include poor starting, fluctuating and generally poor idle, and loss of boost.
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