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Old 02-14-2012, 12:42 PM   #1
rocky_66
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Chapter/Region: RMIC
Location: Draper, UT
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2005 STI
Aspen White

Default 04 sti instantly dies when started

Hey guys, my buddy recently had to swap out his aftermarket turbo-back exhaust and his perrin front mount/intake for stock to pass emissions/smog/intake laws in california. After passing, he swapped everything back to how it was previously and now it's having problems. When he starts it up, it will instantly die. However, if he unplugs the MAF sensor, it will run. He got a hold of another person's working MAF sensor and tried it as well, same problem. Anyone have a clue what's wrong?
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Old 02-14-2012, 12:45 PM   #2
rocky_66
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BTW, his tune is a COBB accessport.
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Old 02-14-2012, 01:23 PM   #3
car_cursed
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Something is unplugged, or he's putting in the maf backwards. Also why not just swap the downpipe, that's the only thing that would prevent him from passing emissions.
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Old 02-14-2012, 01:32 PM   #4
rocky_66
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He had to swap stock turboback because of the downpipe and visual cat inspection. They also wouldn't pass his perrin intake because of California intake laws, and stock wouldn't fit because the front mount piping was in the way, so he had to swap it all back. The first thing I said as well was that the MAF was in backwards but he's tried that as well.
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Old 02-14-2012, 01:35 PM   #5
car_cursed
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Oh, California, I missed that. But something is likely unplugged or a intercooler pipe connection is leaking badly, are there any cel's?
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Old 02-14-2012, 01:55 PM   #6
rocky_66
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Codes he's seen are "low MAF voltage" and something about the air intake temperature I believe, waiting to get more accurate information.
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Old 02-14-2012, 02:09 PM   #7
car_cursed
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It's a maf problem, have him clean it, check all wires and connections
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Old 02-14-2012, 02:16 PM   #8
rocky_66
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codes are p0102 and p0113
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Old 02-14-2012, 02:27 PM   #9
rocky_66
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He's getting these codes when he unplugs the MAF and starts it up though.
If he clears the codes and has the MAF plugged in and starts it, no codes. It just dies.
He said the O-ring is good and it's not on backwards (the plug in part is facing frontwards)
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Old 02-14-2012, 02:51 PM   #10
rocky_66
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With the MAF plugged in, if he gives it gas, it will stay running.
When he lets off the gas, it dies.
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Old 02-14-2012, 03:23 PM   #11
Touge86
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buy gas.
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Old 02-14-2012, 03:50 PM   #12
r8r4life
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Intake issue/leak.
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Old 02-14-2012, 04:44 PM   #13
rossl
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Quote:
Originally Posted by r8r4life View Post
Intake issue/leak.
This. My first guess would be an intercooler hose leak somewhere or something like that.
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Old 02-14-2012, 06:52 PM   #14
rocky_66
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Thanks for your input guys, I'll update when he figures it out. :P
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Old 02-15-2012, 12:38 AM   #15
MarcosV
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Could be an egr or idle regulator. It's most likely the idle regulator and it's a pain in the ass to get to on na blocks.
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Old 02-15-2012, 12:40 AM   #16
MarcosV
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Or your tumble generating valves.
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Old 02-15-2012, 12:45 AM   #17
MarcosV
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Sorry for triple posting but the main source of the problem is that there's no air in your manifold, when you press the gas your throttle body opens allowing air into the manifold and not dying. Checkif the tgv motors are good if you have tgvs but it's most likely the idle regulator on your IM isn't spinning, take it out n clean it with gas.
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Old 02-15-2012, 12:53 AM   #18
wrxkyle
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I have the same exact problem, car runs smooth maf unplugged, dies or stumbles and then carches itself when comming of gas or starting when warm my maf oring is shot but i cleaned my maf and it did better but stull pretty bad, gonna replace the sensor i think. Let me know what you find out

Gonna change the sensor, but i'll look into the idle thing. I thought the dbw sti's just did all that by themselves with no extra valve.

Last edited by wrxkyle; 02-15-2012 at 01:07 AM.
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Old 02-15-2012, 01:56 AM   #19
blk25rsti
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01 2.5RS coupe BRP

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Sounds like throttle position sensor. voltage out of range at no throttle?...
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Old 02-15-2012, 07:54 AM   #20
TurboJunkie85
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Sounds like someone stuffed a rag somewhere in the intercooler piping or, the CBV or, BOV recirculation hose is not hooked up or, capped off.....possibly too the pins for the MAF sensor could of broken off or bent in....
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Old 02-15-2012, 12:26 PM   #21
MarcosV
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If it was a little hose it run but cause a misfire, if it was something blocking the pipes it wouldn't run when accelerated either and if he tried a working maf and it had the same problem then it's probably not the maf.
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Old 02-15-2012, 12:52 PM   #22
rocky_66
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Thanks everyone for your input, it's very greatly appreciated!

Today he "messed with the MAF, giggles some wires and disconnected and reconnected the battery" and his car will idle now. When he gives it gas and the car attempts to go back to idle, it'll chug and almost die again.
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Old 02-15-2012, 01:59 PM   #23
MarcosV
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rbp

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If he gives up I'll buy this from him
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Old 02-15-2012, 02:25 PM   #24
medamullet
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Quote:
Originally Posted by MarcosV View Post
If he gives up I'll buy this from him
most those things you named have their own CEL's If a motor was stuck shut or open he would have a different cel number. I think it has a leak somewhere. check for hoses not plugged in somewhere.
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Old 02-15-2012, 02:33 PM   #25
MarcosV
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He has some Obd codes I haven't looked them up, if the motor on the tgvs don't have a high enough voltage at a specific time or the idle regulator turbine is broken(where the motor spins but turbine doesn't) then it won't throw the code but will not go. Injectors can also not have enough voltage at idle allowing the car to die but then you would get the "mixture too lean" code.
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