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Old 11-02-2009, 10:08 PM   #1
Bug_i_Sti
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Default Help! wont idle!

IVE TRIED SEARCHING... nothing found.


ok so i just got thro with my swap... 04 sti ej257 complete swap (complete harness and the works) into 02 wrx... heres the issues:

car wont idle at all
idles at around 2000rpm when maf is unplugged
changed maf's with a friend , it isnt the maf
car will build boost under very little throttle, wot it misses horribly..

car will rev fine when there is no load but under load it misses horribly...

NO CELS

anyone have any clue whats goin on?

mods:
-perrin inlet
-tbe

thanks in advance guys n gals!!
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Old 11-02-2009, 10:29 PM   #2
falcon_view
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Time to check for a vacuum leak, belt/cam timing, fuel pressure, fuel volume/fuel filter, spark plugs, plugged PCV valve or sludge sticking the valve.
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Old 11-02-2009, 10:34 PM   #3
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Oh yay.

Ill check as much as I can tmrw n report back. Thanks for the advice!

Ps- how would I check the stuck valve? Leak down test?
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Old 11-02-2009, 10:38 PM   #4
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I haven't got to the valve train yet just the PCV valve. It you had a stuck intake are exhaust valve you would hear some ticking. There is a thread in here about the PCV valve and it is a pain to do. The valve is in a threaded plastic housing and the plactic breaks easy, so do this as a last resort
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Old 11-02-2009, 10:40 PM   #5
Bug_i_Sti
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Well I've got ticking but it sounds bout normal for an sti... Or so I've thought... Damn...
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Old 11-02-2009, 10:48 PM   #6
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your harness did include the ecu right?
Do you have a way to log?

Something sounds way off.
It would have to be a big ol leak if your missing like that under load.
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Old 11-02-2009, 10:51 PM   #7
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Quote:
Originally Posted by Bug_i_Sti View Post
Well I've got ticking but it sounds bout normal for an sti... Or so I've thought... Damn...
The injectors are going to tick but a valve will be much louder. If it is a valve sticking open a compression test would tell a lot. So don't sweat this too soon.
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Old 11-02-2009, 10:56 PM   #8
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what intake? mine did this when i switched intakes and had a leak around the maf
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Old 11-02-2009, 10:59 PM   #9
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No way to log yet... Other than an ob2 scanner log... I'm not getting any codes tho?? If it was a valve wouldn't it have a misfire??
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Old 11-02-2009, 11:00 PM   #10
my02turboWRX
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if it was a valve YOU would know

Was this a long block or short block??
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Old 11-02-2009, 11:01 PM   #11
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Its a perrin inlet with a turboxs shorty
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Old 11-02-2009, 11:03 PM   #12
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It was a complete sti swap... It was everything... The motor supposedly had around 51k on it.
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Old 11-02-2009, 11:10 PM   #13
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Quote:
Originally Posted by Bug_i_Sti View Post
Its a perrin inlet with a turboxs shorty
same intake this happened to me on. its at turboxs now for measuring, i'll let you know. might be a bad batch
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Old 11-02-2009, 11:13 PM   #14
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Haha well I'm almost positive that's not it man... Doesn't do it on my buddy's car.. He has the same exact intake... Not the inlet but the shorty..... So that's def not my problem.. Hope you get yours fixed tho!
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Old 11-02-2009, 11:16 PM   #15
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From the symptoms it definitely sounds like you have a vac/boost leak somewhere along the line.
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Old 11-02-2009, 11:18 PM   #16
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I believe the key is that it will go thro the rpm range with light throttle but once its around 75% and 3500rpm, it starts missing horribly... Also it will hold idle without the maf plugged in, but its at like 2000rpm... It has new plugs...

Possible things I've thought..

-fuel pump?
-fuel filter?
-gap on plugs
-o2 sensor??
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Old 11-02-2009, 11:21 PM   #17
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Dude I'm praying its only a vac or boost leak issue... Is the carb cleaner the best way for vac leaks?
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Old 11-02-2009, 11:22 PM   #18
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check the gapping on the plugs....what kind of plugs are they?
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Old 11-02-2009, 11:23 PM   #19
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Quote:
Originally Posted by Bug_i_Sti View Post
Haha well I'm almost positive that's not it man... Doesn't do it on my buddy's car.. He has the same exact intake... Not the inlet but the shorty..... So that's def not my problem.. Hope you get yours fixed tho!
well thats good. i have a friend with the same intake too, his has a slightly smaller opening, mine does not so my maf does not seal, his does. Good luck though, plugs aren't fowled are they?
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Old 11-02-2009, 11:30 PM   #20
Bug_i_Sti
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NGK-ILFR6B gapped at around 30
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Old 11-02-2009, 11:33 PM   #21
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I checked 2 and 4 today and they looked fine..
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Old 11-02-2009, 11:35 PM   #22
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Also I just wanna say thanks so much guys.. I never expected to get so many responses...

THANKS !! Hopefully I can get this thing fixed so I can start adding suspension!
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Old 11-02-2009, 11:46 PM   #23
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Report back when fixed
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Old 11-03-2009, 08:48 AM   #24
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Sure will man... Thanks for all the help !
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Old 11-03-2009, 02:29 PM   #25
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Ok, well after a quick visual inspection I found a leaky injector... Passenger side head, farthest from firewall... I'm suspecting fuel issues, the spark plugs looked a lil white'sh... I'm pulling out the lm-1 this evening...also the car sat for about a year while I was collecting parts and getting everything together.. I should probably change the filter and pump neways right??
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