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Old 01-08-2008, 11:55 AM   #1
samandw
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Default 1994 Ej22 Throttle response

Hello,

My Legacy has recently developed a lack of throttle response. It's plenty peppy and normal up to about a 1/4 throttle, but hammer it all the way down, and I get little if any more power than 1/4 throttle. . .even at higher RPM's. It also sputters and bogs badly if you get on it when it's just started cold (I know, I know, I don't do that normally, just hoping it's a clue). I'm thinking maybe the MAF or possibly the TPS is bad. . .anybody else had a similar experience?
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Old 01-08-2008, 12:19 PM   #2
Legacy777
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AWD 5MT EJ22T AWIC Swap

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I'd suggest checking to see if there are any codes stored in the ECU. Instructions are on my site
www.surrealmirage.com/subaru/engine.html

I'd probably recommend replacing the coolant temp sensor as it can give you drivability issues if bad or worn.

Also, you may want to check out www.bbs.legacycentral.org if you haven't already found it.

Josh
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Old 01-08-2008, 08:34 PM   #3
badhat
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thanks for the links Josh. Should prove helpful.

Bruno
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Old 01-10-2008, 01:02 PM   #4
Legacy777
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Welcome
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Old 01-11-2008, 12:48 PM   #5
samandw
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awesome link, looks like I'll be resetting the ECM and testing the TPS sensor this weekend. It's throwing an O2 code even though I've got a new OEM O2 sensor in it. . .think I didn't disconnect the battery long enough. I'll keep ya posted. Thanks!
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Old 01-16-2008, 11:44 AM   #6
samandw
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Well I reset the ECM per the directions on your link, now I'm getting a code 31 (TPS).

I tested the TPS sensor and couldn't seem to get any voltage, but the resistance is slightly out of spec 9.91/1.84 Kilo-Ohms with the throttle closed/open.

I have an extra TPS sensor on my spare engine (1991 ej22), how hard are they to swap, any calibration required?
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Old 01-16-2008, 11:58 AM   #7
kheff46
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i had a front dampened pulley come loose and give CEL's, O2, bank1, bank2, etc.
ran fine otherwise.

just give it a wobble to see! free to check

--keith
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Old 01-17-2008, 12:26 PM   #8
Legacy777
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Yeah, you need to calibrate the TPS using idle switch.

Instructions can be found on my server
http://www.main.experiencetherave.co...S_testing3.jpg
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Old 01-17-2008, 02:02 PM   #9
samandw
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Thanks!

Sounds like I have my work cut out for me
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Old 01-22-2008, 12:08 PM   #10
samandw
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Calibrated the TPS, still no change, still throwing the TPS code. However, I backprobed the terminals, and terminal 3 (IIRC, I went off the instructions) is at 5.00 volts like it's supposed to be, terminal 2 however, is reading no voltage at any throttle position. I plugged a spare TPS sensor I had into the connector and backprobed it and got the same thing. I give up, it's going in to the shop tomorrow (Smart Service). I'll post up what they find out once I know. . .
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Old 01-22-2008, 01:08 PM   #11
Legacy777
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You can test the TPS via these instructions
http://www.main.experiencetherave.co...S_testing1.jpg
http://www.main.experiencetherave.co...S_testing2.jpg

You may have an issue with wiring or the ECU. Let us know what you find out.

Josh
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Old 01-24-2008, 12:33 PM   #12
samandw
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Well, I took it in to the shop. No luck. I guess it started working properly once they had it. . .arrrg. I'm going to replace the TPS sensor with a spare I have just for good measure to see if that eliminates the code. They drove the car and thought it felt fine, power-wise. Maybe it's all in my head, but I seem to remember this car having more power. Is it possible that the ej22 just doesn't have a very linear throttle response?

Up to about 1/4 throttle it feels very linear, but then it feels like I get another 15% more power (if that) going from 1/4 to WOT. My air filter is fairly new and I hardly ever drive dusty roads, but I'll check it. Pretty sure it's not the cat as I dropped it and took the car for a spin with no change (except the noise of course). Maybe a compression test is in order?
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Old 01-24-2008, 12:35 PM   #13
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Did you do a tune-up recently? Maybe be time for new plugs and wires...
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Old 01-24-2008, 02:12 PM   #14
samandw
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Quote:
Originally Posted by rougeben83 View Post
Did you do a tune-up recently? Maybe be time for new plugs and wires...
Done about 6000 miles ago.
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