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Old 11-06-2010, 02:30 AM   #1
psychorunner
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2002 Bugeye STI
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Default 2005 STi swap. runs only w/o MAF. Stuck in valet mode??

Over the past two weeks I have been doing a full STI swap. Today I finally got it on the ground and driving but need a few issues resolved and haven't been able to find much info on them.

Model: 2002 WRX with 2005 STI swap (including entire drivetrain, interior, wire, ect)

Mods: Grimmspeed BCS, catted TBE, AEM intake

What's wrong:

1.) Will not rev past 3000 RPM - even when in motion it boggs down right at 3000 RPM (stuck in valet mode?). No boost.

2.) Very rough idle when MAF sensor is plugged in, runs smoothly without it plugged in

3.) CEL for "Throttle Position Sensor low input"

4.) DCCD controls do not work (checked all plugs)

5.) Rear defroster cycles on and off constantly

6.) Wiper motor randomly turns on and off

7.) Cruise control dummy light is always on

Maybe these are all separate issues, but maybe they are somehow related. Some ideas I've come across are the possibility of the immobilizer or some sensor in the steering column. Checked all fuses, haven't checked for vaccum leaks, MAF is installed correctly. Maybe it's all just a ton of different problems, but it seems that many of these issues are most likely related. Let me know if the info isn't clear.
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Old 11-07-2010, 01:27 AM   #2
speedyHAM
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XP class Impreza L

Default

I would bet the issues are all related.

Where in MN are you? There are a bunch of us swappers local to the twin cities area that might be able to check the car out in person and give you a hand. Check on MNsubaru.com.

Do you have the green plugs under the dash connected? They are supposed to be disconnected for regular driving. That would explain a few of the problems.

I suggest you don't drive it until you get these problems fixed.
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Old 11-24-2010, 09:27 AM   #3
psychorunner
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So, Just in case someone has any of the same problems I had here's the solutions we found:

1. Will not rev past 3k - Gas pedal sensor was broken. We had tried to plastic weld the sensor back on because it broke in the STI's rollover, but this obviously didn't work. Got a new pedal off an 06 Legacy and it works great now.

2. Rough Idle - Boost leaks and lots of them - missing bolts in throttle body, chewed up 90 deg. IC elbow, cracked intercooler (welded that), and boost gauge vaccum line would keep popping off.

3. Directly related to #1

4. Indirectly related to #1

5. loose conection to HVAC control, tightened down with ziptie!

6. Wrong wiring because we were using STI harness and WRX wiper motor

7. Cruise control light cleared with CEL


Hopefully someone runs into this someday and it helps!
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Old 12-12-2010, 10:59 PM   #4
teesutt
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I am having similar issues swapping an 04 sti motor, tranny, ecu, wire harness etc into an 05 wrx.

Starts, but wont rev, at all. Gas pedal is totally unresponsive. Idles fine. The ecu is opensource tuned for stage 2 sti with stock airbox, turbo and intercooler.

It has a vf34, fmic and k&n intake. Possible issue there?
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Old 12-13-2010, 12:43 AM   #5
Hondaslayer
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1998 Forester, lifted.

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Drive by wire issue. Check the pedal assembly first, that is most common.
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Old 12-13-2010, 01:23 AM   #6
teesutt
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what should I look for?
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Old 12-13-2010, 02:06 AM   #7
psychorunner
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Quote:
Originally Posted by teesutt View Post
what should I look for?

Look for physical damage. Also, if you have access to a tactrix cable and can log you may be able to log the throttle angle. the 05 STI also uses the same gas pedal as the Legacy GT.
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Old 12-13-2010, 02:17 PM   #8
teesutt
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I'll try it out. thanks!
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Old 01-22-2011, 07:31 PM   #9
teesutt
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as it turns out, since i swapped a dbw setup into a car that was previously dbc, there was a power relay for the throttle body that was missing. replaced that and car revved fine.
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Old 01-22-2011, 09:12 PM   #10
psychorunner
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Quote:
Originally Posted by teesutt View Post
as it turns out, since i swapped a dbw setup into a car that was previously dbc, there was a power relay for the throttle body that was missing. replaced that and car revved fine.
Nice! Good to hear!
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Old 10-03-2011, 06:44 PM   #11
recondelta2874
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where was the relay located can you post a picture?
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