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Old 02-28-2001, 08:06 PM   #1
randy zimmer
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Member#: 4560
Join Date: Feb 2001
Location: Buffalo, NY USA
Vehicle:
93 buy my rally
build manual

Question Help with "hybrid" impreza engine management

Here's the deal...
I bought a ready-built rally impreza - '96 chassis. The drivetrain appears to be a Forester 2.5 single cam (MY2000?)I am told it has "cams" and headwork (10:1, no turbo).
It has one O2 sensor - (single wire ahead of the CAT).
To get it to run "right" I need to disconnect the TPS. It goes OK but not any better than a stock one - rev limit 6000.
If I disconnect the battery overnight and re-connect the TPS, It goes like stink in first and in second gear, then the rev limiter cuts in and won't allow it past 4200. The front 2 injectors don't light a NOID at idle (but start working off idle). Then I have to go home, disconnect the battery and wait overnight.
At the dealer, the stored info does not mention the Mass airflow or TPS but does the second O2 (missing) speed (disconnected from speedo for rally computer input sensor)along with some other less interesting items.
The dealer is blaming the wiring harness and computer which they believe is for a '96 automatic (single plug connection to box).
I'm on my way to Tennessee in a couple weeks and without a scan tool of my own, I can only try one thing a day between overnight battery disconnections. I have a feeling that on limp mode, I'll be safer (slower) but I'd like to have it running properly 1. because it has to be done eventually anyway and 2. with computer control, everything should work better. Does anyone know which sensor may be causing it to limp and a solution? Could it just be the knock sensor from not enough octane? Or does the knock sensor trip a code too? It has not been mentioned on the scan.
Thanks in advance.
(please keep the laughing to a minimum, I really need help).
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Old 03-01-2001, 07:25 PM   #2
Ver.III
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Join Date: Mar 2000
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I flap my gums
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Does the ecu part# confirm it is from a 2000 RS 2.5 ? Was this car running fine b4 you got it?
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Old 03-01-2001, 07:46 PM   #3
randy zimmer
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93 buy my rally
build manual

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The ECU (I'm told by the dealer) is from a 96 automatic.
The guy I bought it from says it ran fine and was "surprised" it didn't. We worked on it all day and he repeatedly said it was fine but was not.
Was he stupid or lying? I can't say which.
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Old 03-01-2001, 09:33 PM   #4
Ver.III
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That don't make no sense. I thought 96 ecu's are 4-plug connector. If there is any wires that are not connected or loose, I suggest you look into finding out what they were for previously. There may be something missing or not hooked up. Check all the ground connections on the ecu to chasis, battery to tranny and body. If it supposedy ran fine before you got it, maybe something got jogged loose.
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Old 03-02-2001, 01:49 PM   #5
Greg555
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Chapter/Region: MWSOC
Location: Chicago, il USA
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Want engine mgmnt?
I sell ViPec's ECU's

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The only time I`ve seen that rev limiter would cut in and won't allow it past 4200 was when the ground cable to the engine wasn`t conected.

If you stand in front of the car, it`s the one that attaches to intake manifold just right of the ignition coil.
That`s most likely not it but worth a try.
Let me know if that helped.

Good luck
And who did you buy the car from??
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