dies off of idle...

**batman** · 06-26-2009 10:50 AM

ok, so you know how the rpms will drop just below idle then raise back up if you, rev your engine or something? well mine are dropping REALLY low like down to 100 ish. Sometimes even low enough that it dies, this has been happening frequently all of a sudden. Any ideas?

oh, 2004 Sti 84k mi last oil change less than 1000 mi ago....

**wrx0131** · 06-26-2009 10:52 AM

Originally Posted by batman

ok, so you know how the rpms will drop just below idle then raise back up if you, rev your engine or something? well mine are dropping REALLY low like down to 100 ish. Sometimes even low enough that it dies, this has been happening frequently all of a sudden. Any ideas?

oh, 2004 Sti 84k mi last oil change less than 1000 mi ago....

It could be:
Dirty fuel filter
Dirty air filter
Faulty/dirty MAF sensor
Leaking injectors
Vacuum leak
Faulty fuel pump

**batman** · 06-26-2009 11:15 AM

thanks! Gonna run some seafoam through it this weekend and I'll check the air and fuel filter. I just checked the MAF. Thanks for the tips!

**wrx0131** · 06-26-2009 11:17 AM

Originally Posted by batman

thanks! Gonna run some seafoam through it this weekend and I'll check the air and fuel filter. I just checked the MAF. Thanks for the tips!

No prob

When I had this problem it turned out to be the fuel filter

**batman** · 07-07-2009 02:46 PM

so I ran the seafoam through her and it didn't seem to help. Recharged the K&N and I'm pulling the throttle body and cleaning it tonight.

It's wierd because the car seems fine when I'm driving, then I go to slow down to turn in a driveway or stop at a stoplight and it just dies when the rpms drop. And its not throwing a CEL so I can't get any codes to go off of...

**tylr** · 07-07-2009 10:02 PM

So i just bought a 04 WRX, and love it...except that it dies when I slow down to turn,etc after the engine gets warm. Read other posts, and I have already cleaned the injector, the AICV, checked for vacuum leaks, and all were ok. I cleaned the MAF sensor. I tried removing the MAF while it was running and it died...i did the reverse and disconnected the MAF, started the engine, and it idled @ 1k RPM. Reconnceted the MAF, and it went down to the normal 750, and then it bogged down like normal, and jumped back up to 750. It doesnt stall out everytime i slow down to turn, but about 75% of the time it does. I'm almost convinced that the MAF is malfunctioning, rather than just being completely dead, but want input before I spend 220 bucks on a sensor. There's no subaru dealership or repair shop within almost 150 miles from where I live, and I am DESPERATE!

**Sinister** · 07-08-2009 01:14 AM

this issue can also be caused by a lightweight flywheel or a lightened pulley.

**Donkey** · 07-08-2009 07:10 AM

/\ +1 or by having an atmospheric or 50/50 BOV incorrectly set.

**javasutra** · 07-08-2009 07:27 PM

Make sure the air box cover is correctly installed. There are two tabs on the right side that should go in slots in the air box. It takes a little effort to get them in. It's easy (for me, at least) to clip the cover in place incorrectly. That's what was causing my stalling & surging idle issues.

**batman** · 07-11-2009 11:38 AM

still happening.... I can't figure it out and its pissin me off!!!

When its just idling its fine, so I rev the engine it drops back down to 1000rpm, then drops to idle, but drops down to like 100 before coming back up to 500. Doesn't die. I'm thinking that when I'm on the brakes, its drawing enough power to pull down just enough to kill it.... or maybe I'm stupid... I dont know

**javasutra** · 07-12-2009 11:39 AM

I don't know about your model year but the MAF on my '07 is the same part as my wife's '04 Sienna. If nothing else works, you may be able to try a different MAF without buying one.