2002 wrx problem at 3000 rpm

[cknight2480]

Thanks for your help. Tomorrow I'm going to put the stock intake in and see if that's the problem.

[teflon_jones]

Sounds to me like a MAF / airflow issue.

You may also need to clean your MAF.

[anxiouz]

If the car was running fine for a couple of days and then just started acting up...my gut tells me a hose or something popped off/came loose. That may explain why it's only jerking under load when boost starts to build.

But I've had people tell me that I needed an updated map for just adding a drop-in filter (doubtful but who knows) so maybe your stock tune just doesn't handle the CAI airflow changes. I suspect if you put the stock airbox back on your car will be fine again.

[cknight2480]

On my way to work Friday it just magically started running fine for about 12 miles, then it started doing it again. So on Saturday I put the stock air box back in and went for a drive and everything was fine. The next day it started doing it again but its not as intense as it was with the CAI. Sometimes it will run perfectly fine now and sometimes it wont.

[teflon_jones]

Have you cleaned your MAF? This is typical dirty MAF behavior.

[cknight2480]

Have you cleaned your MAF? This is typical dirty MAF behavior.

No I haven't done that yet. But when I was putting the stock stuff back in I looked at it and it didn't look dirty. What do I use to clean it with?

[zax]

What do I use to clean it with?

CRC MAF cleaner.

No I haven't done that yet. But when I was putting the stock stuff back in I looked at it and it didn't look dirty.

Unless you have microscopes for eyes, you can't make that judgement.

[cknight2480]

I cleaned the MAF and it's still doing it. Although now it's doing it at 3400 instead of 3000. I'm probably just going to take it to the local subaru dealer and have them look at it Friday on my day off. Do you guys have any other ideas until then?

[zax]

I cleaned the MAF and it's still doing it. Although now it's doing it at 3400 instead of 3000. I'm probably just going to take it to the local subaru dealer and have them look at it Friday on my day off. Do you guys have any other ideas until then?

If it's just a jerking/hesitation at 3400 RPM, this sounds like the infamous Subaru grounding problem. Some EJ205 owners found that grounding the Battery terminal to the intake manifold to the frame helped to resolve this issue...

http://www.scoobymods.com/diy-grounding-mod-t3569.html