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Old 10-12-2012, 09:58 AM   #26
RealDealTarheel
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My 94WRX would do something similar. I removed the blocking plates for the hood vents and when it rained the MAF would get wet and it would cut and sputter generally despise boost. MAF could be an issue as could your coil packs as previously mentioned.
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Old 11-30-2012, 02:44 AM   #27
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Bump.

Still have this problem...

MAF is fine. Coil packs have again been swapped with known-working packs but no improvement. Everyone seems to be stumped

More ideas? Gonna try hooking up an Apexi Power FC tomorrow to see if it helps. I guess that will rule out a mechanical fault as opposed to the ECU cutting power for whatever reason.
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Old 11-30-2012, 06:31 PM   #28
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Better watch the knock sensor real good after you hook up the PFC. More than likely it won't cut out and could cause some serious problems.

I'd also keep an eye on the IDC since that's probably where you will find your problem.
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Old 11-30-2012, 07:49 PM   #29
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Yeah that's gonna be hard as my knock sensor is kind of redundant We had to move it to a different location as it kept picking up false readings and putting the car in limp mode. This was back when I first bought the car and it was still stock. Guess the old engine is too noisy for it to work properly. Only way to stop it doing so was to move it elsewhere, so I'm basically running no knock sensor.

IDC? Injector duty cycle? Is there any way to check that apart from swapping the injectors?

Also I should add that it even cuts at levels below stock boost, just at higher revs. I've been running 10psi lately and it cuts at about 6500rpm or so. So less boost = cuts at higher revs and vice versa.
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Old 11-30-2012, 09:06 PM   #30
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Quote:
Originally Posted by Merko View Post
Yeah that's gonna be hard as my knock sensor is kind of redundant We had to move it to a different location as it kept picking up false readings and putting the car in limp mode. This was back when I first bought the car and it was still stock. Guess the old engine is too noisy for it to work properly. Only way to stop it doing so was to move it elsewhere, so I'm basically running no knock sensor.

IDC? Injector duty cycle? Is there any way to check that apart from swapping the injectors?

Also I should add that it even cuts at levels below stock boost, just at higher revs. I've been running 10psi lately and it cuts at about 6500rpm or so. So less boost = cuts at higher revs and vice versa.
Yes the FC Commander will tell you the percentage that the injectors are at real time in the "monitor" menu.
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Old 12-01-2012, 03:52 AM   #31
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mine did that and it was my crank position sensor
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Old 12-01-2012, 05:45 AM   #32
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Already tried that with no success
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Old 12-01-2012, 09:19 PM   #33
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Quote:
Originally Posted by eg33GC View Post
yeah, those pesky Subaru engineers limited his z4 ecu to 5000.


your fuel pump may be dropping off at 5000ish due to a clogged sock or maybe stock filter

pesky engineers limited your **** to 5K... oh wait.. you ****ed up. kid.
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Old 12-01-2012, 09:22 PM   #34
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You're still around?
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Old 12-02-2012, 12:14 AM   #35
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Go back to general Dan
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Old 12-02-2012, 02:24 AM   #36
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K update: Car was still cutting with the Power FC. Think this rules out the ECU cutting power and means it's a mechanical issue.

I wasn't there when it was being tested, but the mechanic said the numbers spat out by the Power FC were all good, so it's a bloody mystery! Though he said the power kept cutting every time the injector duty cycle got to 90%.
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Old 12-12-2012, 10:30 PM   #37
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How do you know the coil packs are good? I don't think visual inspection is good enough to verify that 20 year old coil packs are good. If you haven't replaced them with newer coilpacks and done the mod I would suggest you do it:

http://forums.nasioc.com/forums/show....php?t=1192028

I have a similar problem on my EJ20g, it's intermittent and happens only at full boost and full throttle at around 5k rpm. If it's not getting full boost or full throttle it doesn't happen. Reading up on the forums I'm hoping it's the coil packs.
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Old 12-13-2012, 07:22 AM   #38
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It's not coil packs because yes they look to be in very good condition, but also because as already stated, we swapped them with known working coil packs but to no avail.

Also it doesn't happen at part throttle for me either.
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Old 12-13-2012, 08:52 AM   #39
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dumb question, but have you checked for boost leaks?
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Old 12-13-2012, 05:30 PM   #40
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are you using stock coil packs or updated coil packs? the coil packs on that year of car have an external igniter which are known to go bad as the updated coil packs have an internal igniter.

also can you post the readings from the power fc?
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Old 12-14-2012, 01:05 AM   #41
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just do the damn coil pack upgrade to the 02+ style and then shake your head after going so long with not doing this simple $100 mod that fixed your problem.
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Old 12-14-2012, 02:44 PM   #42
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I agree with above, just change the coil packs to 02+
I found mine for $92 shipped, will install ASAP.
I don't think this is a mystery, you've simply labelled a non-working component of your system as working and need to go through your diagnosis algorithm again. I've done this before as I've replace a system component with one I thought would fix the problem and it didn't. Turned out to be a faulty replacement component.
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Old 12-14-2012, 04:50 PM   #43
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My late EJ20G does the exact same thing. I haven't looked into a ton, but it will rev past 5k or 5.5k with partial throttle.

Maxing out the MAF possibly? And I agree, it's not a boost thing. I have had my MBC set from 9-12psi, no change. I need help too.
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Old 12-16-2012, 06:47 PM   #44
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Change your coilpacks to the 02+ style people.
Its being laid out for you multiple times over.

1. Ask for advice.
2. Receive multiple responses of same solution to your problem.
3. Refuse that this could be the problem and replace every other single thing you can think of that could fix the problem.
4. Problem still remains.
5. Go back to step 2 and this time, take the damn advice.



These older style coilpacks and seperate ignitor are garbage, change to the new style coilpacks.
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Old 12-18-2012, 11:39 AM   #45
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My late EJ20G has the wasted spark setup with external ignitor. Think that's my problem too? It's not that I wasn't reading and was ignoring advice, it's that I don't have the coil on plug setup.
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Old 12-23-2012, 11:38 AM   #46
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Quote:
Originally Posted by GGSimpreza View Post
My late EJ20G has the wasted spark setup with external ignitor. Think that's my problem too? It's not that I wasn't reading and was ignoring advice, it's that I don't have the coil on plug setup.

No no this wasnt directed to you, just the OP.

Your EJ20G must have came out of a Fozzy!
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Old 12-23-2012, 05:46 PM   #47
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Quote:
Originally Posted by blessthekellen View Post
Change your coilpacks to the 02+ style people.
Its being laid out for you multiple times over.

1. Ask for advice.
2. Receive multiple responses of same solution to your problem.
3. Refuse that this could be the problem and replace every other single thing you can think of that could fix the problem.
4. Problem still remains.
5. Go back to step 2 and this time, take the damn advice.
Seriously? How many times do *I* need to repeat the same thing. Allow me to try again; the coilpacks have been replaced with KNOWN WORKING coilpacks. You know how I know they work? because they were used to diagnose a problem on a car which had a similar problem to mine, and THESE coilpacks worked, thereby solving the problem on the other car. Why would I go waste my time and money on a coilpack conversion when this has proven to not be the problem? And where have I refused coilpacks could be the problem? I wouldn't have swapped the coilpacks if I didn't think it could be the problem now would I... I don't care how bad the design on the early packs was, it's not so bad that it can't handle below-stock boost when they are in good working condition.

Ignitor has been replaced now as well to no avail. Car is going to an auto electrician in a couple of weeks.

Last edited by Merko; 12-23-2012 at 05:53 PM.
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Old 12-23-2012, 08:55 PM   #48
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Im still going to laugh at you when you can't figure out this problem because you refuse to do a $100 modification when you have already spent well over 5 times that trying to figure it out.

Have fun mate.
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Old 12-23-2012, 09:01 PM   #49
Merko
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Well I have sourced some GD packs quite easily today. So I will do the mod today and we shall see.
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Old 12-23-2012, 11:48 PM   #50
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Wish you luck (:
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