6SpdJdM Posted May 2, 2022 Share Posted May 2, 2022 Hello all, I am new here and also new to Subaru. I just bought a 2010 Legacy 2.5 Auto non turbo. I’m having an issue where there is no acceleration. When in park or neutral, I can press the gas pedal and there is serious hesitation then it slowly clears up and revs up. In drive and reverse, it will not move and doesn’t accelerate. The person I bought it from put a new throttle body on it and it didn’t fix it. There are no check engine codes at all. I read live data, and when I press the gas it shows pedal position accurately. And when I press the pedal in drive, even to 100%, the throttle body shows maybe 60% open. I’m at a loss. Any help would be greatly appreciated. Link to comment Share on other sites More sharing options...
FLlegacy Posted May 3, 2022 Share Posted May 3, 2022 Thats not a lot of information to work off of, does it show any pending codes? I would check the plugs/coils, clean the maf, check for air leaks after the MAF sensor, make sure the timing isn't off and the belt has been changed on time...what caused the issue to begin with? Link to comment Share on other sites More sharing options...
ammcinnis Posted May 7, 2022 Share Posted May 7, 2022 If you haven't already, check the camshaft timing. Your engine has a timing belt, and if it gets worn/loose the engine can jump timing, causing the symptoms you describe. If cam timing jumps too far the pistons can contact the intake and/or exhaust valves, resulting in major engine damage. Better to check this sooner rather than later. "If you don't know where you're going, any road will take you there." ~ The Cheshire Cat (Alice in Wonderland) Link to comment Share on other sites More sharing options...
6SpdJdM Posted May 8, 2022 Author Share Posted May 8, 2022 (edited) So I don’t know what caused the issue in the first place. The person I got it from said it had a dead accelerator pedal. They tried replacing the throttle body and that didn’t fix it so the person sold it to me. Was hoping to make a nice economic daily out of it. There are no check engine or error codes at all. No pending, history, or current codes. Idk if they cleared them or what but there is nothing. Edited May 8, 2022 by 6SpdJdM Link to comment Share on other sites More sharing options...
Fabsx Posted May 8, 2022 Share Posted May 8, 2022 So I don’t know what caused the issue in the first place. The person I got it from said it had a dead accelerator pedal. They tried replacing the throttle body and that didn’t fix it so the person sold it to me. Was hoping to make a nice economic daily out of it. There are no check engine or error codes at all. No pending, history, or current codes. Idk if they cleared them or what but there is nothing. Long shot.. check throttle pedal. Also, does your dash show when you into park or drive? Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
FLlegacy Posted May 11, 2022 Share Posted May 11, 2022 Could this be a clogged Catalytic converter? Maybe there is no throttle response because there is too much backpressure. Link to comment Share on other sites More sharing options...
TecherDonkeyBOS Posted May 18, 2022 Share Posted May 18, 2022 following. Similar issue. Link to comment Share on other sites More sharing options...
6SpdJdM Posted May 24, 2022 Author Share Posted May 24, 2022 Sorry I haven’t replied in a while. I appreciate all the input. I have not been able to drive the car as it won’t even make it out of the driveway. I did take the the cat off and it still won’t move. Still wants to bog at idle and when u put it in drive or reverse, it won’t move. I am at a loss. Once it cools down I am able to move it but as soon as I stop, it will move no more. I can only move it when the car is completely cold and only until I come to a stop. So I tried my diag tool again and finally pulled 4 codes. Accel pedal a P0123, accel pedal b P0223, MAF circuit low P0102, and intake air temp circuit high P0113. So now I guess throw parts at it? Lol. Link to comment Share on other sites More sharing options...
Plastixx Posted May 24, 2022 Share Posted May 24, 2022 (edited) Sorry I haven’t replied in a while. I appreciate all the input. I have not been able to drive the car as it won’t even make it out of the driveway. I did take the the cat off and it still won’t move. Still wants to bog at idle and when u put it in drive or reverse, it won’t move. I am at a loss. Once it cools down I am able to move it but as soon as I stop, it will move no more. I can only move it when the car is completely cold and only until I come to a stop. So I tried my diag tool again and finally pulled 4 codes. Accel pedal a P0123, accel pedal b P0223, MAF circuit low P0102, and intake air temp circuit high P0113. So now I guess throw parts at it? Lol. That combination of codes leads me to believe it's a wiring problem. Check the wiring on the passenger side of the engine bay around the main harness connector and the throttle body. It's possible an animal has been snacking on some wires. Edited May 24, 2022 by Plastixx Link to comment Share on other sites More sharing options...
Fabsx Posted May 25, 2022 Share Posted May 25, 2022 Sorry I haven’t replied in a while. I appreciate all the input. I have not been able to drive the car as it won’t even make it out of the driveway. I did take the the cat off and it still won’t move. Still wants to bog at idle and when u put it in drive or reverse, it won’t move. I am at a loss. Once it cools down I am able to move it but as soon as I stop, it will move no more. I can only move it when the car is completely cold and only until I come to a stop. So I tried my diag tool again and finally pulled 4 codes. Accel pedal a P0123, accel pedal b P0223, MAF circuit low P0102, and intake air temp circuit high P0113. So now I guess throw parts at it? Lol. Throttle Position sensor seems to be correlation with p0123, is the new TB Oem or aftermarket? P0102 for Maf is interesting.. remove your Maf sensor from intake and verify there is nothing inside near the wires. Occasionally a hair or bug can get stuck inside the Maf sensor causing issues. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
6SpdJdM Posted May 27, 2022 Author Share Posted May 27, 2022 I will have a better look at it this weekend and check the wiring and inspect the MAF. The throttle body on it is aftermarket, according to the previous owner. It did look new when I took of the cover on the intake. Link to comment Share on other sites More sharing options...
Fabsx Posted May 27, 2022 Share Posted May 27, 2022 I will have a better look at it this weekend and check the wiring and inspect the MAF. The throttle body on it is aftermarket, according to the previous owner. It did look new when I took of the cover on the intake. I’ve seen and heard of aftermarket throttle body causing issues. Maybe pop off intake, car on but not running and have someone push the throttle pedal to the floor and verify that the actual throttle plate is opening 100% with 100% input at pedal. Just this week, had someone with a MAF code and ended up being a little fuzz inside the MAF sensor, blew it out and ran perfectly. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Plastixx Posted May 27, 2022 Share Posted May 27, 2022 I’ve seen and heard of aftermarket throttle body causing issues. Maybe pop off intake, car on but not running and have someone push the throttle pedal to the floor and verify that the actual throttle plate is opening 100% with 100% input at pedal. Just this week, had someone with a MAF code and ended up being a little fuzz inside the MAF sensor, blew it out and ran perfectly. Sent from my iPhone using Tapatalk You're focusing on the specific parts the codes are for (TB and MAF) instead of what the codes mean. He has 4 circuit codes for two different parts. It's most definitely a wiring problem. If I were him, after ruling out any visible wire damage, I would have someone press the accelerator with the engine running while flexing the wires for the main harness. There could be an internal break/short. Link to comment Share on other sites More sharing options...
6SpdJdM Posted May 27, 2022 Author Share Posted May 27, 2022 I will try these things and see what happens. I did replace the pedal and it didn’t fix it at all. It’s still doing the same thing. Link to comment Share on other sites More sharing options...
Fabsx Posted May 28, 2022 Share Posted May 28, 2022 You're focusing on the specific parts the codes are for (TB and MAF) instead of what the codes mean. He has 4 circuit codes for two different parts. It's most definitely a wiring problem. If I were him, after ruling out any visible wire damage, I would have someone press the accelerator with the engine running while flexing the wires for the main harness. There could be an internal break/short. I would absolutely not run the vehicle doing this! Lol It’s a maf based system, opening up the intake tract, while running will cause bigger issues. I clearly stated the same thing you stated but with the engine running. But what do I know anyways right? Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Plastixx Posted May 28, 2022 Share Posted May 28, 2022 (edited) It’s a maf based system, opening up the intake tract, while running will cause bigger issues. Wtf... I never suggested that. Car in park, partial throttle, move wiring around to see if RPMs change. Ideally you would want to use a scan tool with live data to view MAF and TB signals while moving the wiring around, then the engine wouldn't need to be running at all. Edited May 28, 2022 by Plastixx Link to comment Share on other sites More sharing options...
Fabsx Posted May 28, 2022 Share Posted May 28, 2022 Wtf... I never suggested that. Car in park, partial throttle, move wiring around to see if RPMs change. Ideally you would want to use a scan tool with live data to view MAF and TB signals while moving the wiring around, then the engine wouldn't need to be running at all. And I copied quote from your post “If I were him, after ruling out any visible wire damage, I would have someone press the accelerator with the engine running while flexing” ^^^^^^^^^^^ Stated running But whatever, here to help anyways. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Plastixx Posted May 28, 2022 Share Posted May 28, 2022 Where in that quote do I suggest doing it with the intake off? Link to comment Share on other sites More sharing options...
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