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Old 08-04-2004, 12:59 PM   #1
Subiemax
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Default Bad idle and killing on warm start?

Every time I stop my 04 sti for 20-30min and try to start it again it will hardly run at all. Rpms will barely register on the tack. It vibrates badly and a few times has just killed on me. Now if I start it and rev it everything is fine, but I shouldn't have to do this.
I read an old thread on this but nobody gave a good answere.
Anybody brought this to a dealer? Or come up with a fix on their own?
Really pissed me off when I picked up my date, got in the ride and cranked it up, and it's spittin, sputterin and just died. And she's like
Sucks to be me!
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Old 08-04-2004, 01:27 PM   #2
DISCOPOPE
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stock?
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Old 08-04-2004, 01:28 PM   #3
Silver-Bolt
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Any mods? Possible vacuum leak or injector issue.
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Old 08-04-2004, 01:30 PM   #4
Subiemax
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Quote:
Originally Posted by Silver-Bolt
Any mods? Possible vacuum leak or injector issue.
Stock! No mods.
Unless you call intake elbow a mod.
But I really don't call that a mod.
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Old 08-04-2004, 01:39 PM   #5
DISCOPOPE
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ok.
maybe:
california, (see also bad) gas
leak in intake AFTER the maf, possably when you had the intak apart?
bad plug/s
Front O2 borked
Throttle Body seal?? IC seal??
vacuum leak
Broken MAF, wire, or maybe MAF not seated correctly...

Last edited by DISCOPOPE; 08-04-2004 at 01:44 PM.
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Old 08-04-2004, 01:43 PM   #6
DISCOPOPE
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no misfire cels?
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Old 08-04-2004, 01:44 PM   #7
KatukasGTi
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Quote:
Originally Posted by Subiemax
Stock! No mods.
Unless you call intake elbow a mod.
But I really don't call that a mod.
Why do you need that intake elbow ? Maybe this in not a reason but maybe engine is getting very hot air when you start it ? Is it from metal ? When you rev it intake cools down and everything starts to work. I would try to put stock part first.

andrius
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Old 08-04-2004, 01:46 PM   #8
Subiemax
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happened berfor and after elbow.
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Old 08-04-2004, 01:50 PM   #9
Subiemax
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No CELs
It just idles very badly.
Reving the engine just makes it not idle.
I'm in LA-Louisiana!
We got 93oct.
Just seems like a hot-start problem.
I've seen others with this problem, but no solutions.
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Old 08-04-2004, 01:52 PM   #10
DISCOPOPE
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ah, LA not L.A. ok,
i still vote bad gas, but check all your hoses to make sure they are seated correctly.
iirc some of the first sti's were delivered with leaks in the ic coupling. i sometimes remember things incorrectly, so maybe i'll get admonished here soon.

also the stock air box can be a bitch to get locked down the first few times you try.
make sure thats buckled down tight.

Last edited by DISCOPOPE; 08-04-2004 at 01:57 PM.
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Old 08-04-2004, 01:52 PM   #11
Subiemax
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Quote:
Originally Posted by KatukasGTi
Why do you need that intake elbow ? Maybe this in not a reason but maybe engine is getting very hot air when you start it ? Is it from metal ? When you rev it intake cools down and everything starts to work. I would try to put stock part first.

andrius
Intake elbow just deletes the silencer. If anything it give a less restrictive path for fresh, colder air to the intake.
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Old 08-04-2004, 01:56 PM   #12
Subiemax
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Quote:
Originally Posted by DISCOPOPE
ah, LA not L.A. ok,
i still vote bad gas, but check all your hoses to make sure they are seated correctly.
iirc some of the first sti's were delivered with leaks in the ic coupling.

also the stock air box can be a bitch to get locked down the first few times you try.
make sure thats buckled down tight.
The other LA
Car is about 2 months old.
I had alot of practice with my wrx on the airbox. Definately a learned skill!
Could be bad gas... I'll just keep an eye on it. See if it keeps on.
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Old 08-04-2004, 01:57 PM   #13
KatukasGTi
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It think you can notice this on every car and any model. It's called heatsoap. Maybe one of the sensors is malfunctioning making cars computer more dificult to keep rpms.
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Old 08-04-2004, 02:02 PM   #14
Subiemax
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Quote:
Originally Posted by KatukasGTi
It think you can notice this on every car and any model. It's called heatsoap. Maybe one of the sensors is malfunctioning making cars computer more dificult to keep rpms.
HEATSOAP!
Is that good for cleaning rims!
JK
Heatsoak...
Maybe, what i'm trying to find out is if someone else had a bad sensor or something.
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Old 08-04-2004, 02:35 PM   #15
wolverine
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stock -> take to dealer
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Old 08-04-2004, 02:53 PM   #16
Subiemax
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Quote:
Originally Posted by wolverine
stock -> take to dealer
Yes, thats good. I just wanted input.
Dealer is an hour drive.
If it keeps on I will.
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Old 03-20-2006, 06:16 PM   #17
R4ND0M_AX3
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Did this get solved? Did it only run poorly for a short time after a hot start or did it always do it during warm idle?
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Old 03-21-2006, 12:09 AM   #18
my94saleen
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Default idle

do you use syn oil.seen it on sti an turbo legacy's.switched to conv. oil problem went away.even subaru tech training says with no codes try that.sounds stupid but it has happened a few times.
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