Just bought 2002 wrx with CELS please help!!!

[Wayn3 Zalenski]

Hello everyone Im very new to the subie world and to this site so if this is in the wrong spot please moderators do as you will to move this thread to the correct spot, thank you.

I just bought a 2002 wrx with some check engine lights that Im going to attempt to get rid of but I need your guys help as i am new to all of this. It has a full hks turbo back(no cats), HKS BOV, perrin intake, manual boost controller which the previous owner said it was set to 16psi, act flywheel, blitz turbo timer, and tein stech springs.

The cels im getting are, p0301 ect..(all 4 misfire codes), p0136, p0245, and p0546.

The car starts and idles great, never dies, drives great but i feel it hesitate a bit when gaining boost, like as if its reaching its rev limit as the turbo spools up, and I can hear it back fire, and ill see the turbo timer light up red. I really just baby this thing around because it drives really good just hesitates a bit in higher rpms, The previous owner said its all from the exhaust? that it needs an accessport.

Any help would be much appreciated, I thank you guys much in advance.

[SD_GR]

Misfires: Any number of things, possibly lightened flywheel. Check ignition stuff and check the flywheel model to see if others have had misfires with it.

P0136 and P0245: Could be due to downpipe. If present, the sensor could be faulty. The latter could be a boost issue too though - are you creeping?

P0546: EGT sensor problem in the up pipe. If the correct pipe is fitted, check the connections. If the pipe has been replaced, use a M12 bolt to plug the hole and use a 2.2 kΩ resistor in the harness to prevent another CEL.

[Wayn3 Zalenski]

Misfires: Any number of things, possibly lightened flywheel. Check ignition stuff and check the flywheel model to see if others have had misfires with it.

P0136 and P0245: Could be due to downpipe. If present, the sensor could be faulty. The latter could be a boost issue too though - are you creeping?

P0546: EGT sensor problem in the up pipe. If the correct pipe is fitted, check the connections. If the pipe has been replaced, use a M12 bolt to plug the hole and use a 2.2 kΩ resistor in the harness to prevent another CEL.

Should I get a new down pipe? Ill be tryin the 2.2k resistor solution tomorrow along with new plugs and checking the coilpacks, Are these very serious cel codes? Should I not drive it until I fix them? Are all of them really from the exhaust? Im sorry im new to this im not sure what creeping is? is that where the exhaust has too much air flow? thank you much for your input and help.

[Donkey]

Is the CEL flashing and fans cycling?

[Wayn3 Zalenski]

Is the CEL flashing and fans cycling?

fans cycling, The CEL isnt flashing its on all the time and has never gone away.
Thank you

[Donkey]

Sounds like the green diagnostic connectors under the dash are together. They need to be disconnected if they are.

[anxiouz]

I'm intrigued by the turbo timer lighting up red when the car backfires. There should be absolutely no corelation between those 2 events. Very odd unless the TT is picking up CEL codes or something.

[SD_GR]

Yes if the fans are cycling I'd look at the connectors. I wonder how modified the car was originally, having presumably some sort of EM plus a MBC I suppose.

[Anub1s]

Definitely check the diagnostic connectors.

After that, get rid of the manual boost controller and return it to stock. Then, get rid of the turbo timer. Each of these things are hurting your car more than helping. The MBC without a tune is a VERY bad idea, and the turbo timer is just not needed, not even remotely. Are you sure it's not an AFC as well? That could explain the red lighting, could be noticing a lean condition and the read light is its attempt to alert you to it.

[Wayn3 Zalenski]

Definitely check the diagnostic connectors.

After that, get rid of the manual boost controller and return it to stock. Then, get rid of the turbo timer. Each of these things are hurting your car more than helping. The MBC without a tune is a VERY bad idea, and the turbo timer is just not needed, not even remotely. Are you sure it's not an AFC as well? That could explain the red lighting, could be noticing a lean condition and the read light is its attempt to alert you to it.

I beleive it is running very lean because I can smell it, I disconnected my battery the other night for cleaning the terminals and it reset the computer, drove for about 28 mies and came back on, used my friends obd2 scanner and its only throwing p0136 now. Then found out he had the two 02 sensors unplugged and there was no 02 sensors on the other end? obvious of why its throwing the p0136 code now. how do you fix it from running so lean? I wanna take off the MBC but I want to turn it back down to stock boost but im not sure how as there are no directions on the MBC. Also where do i find the diagnostic connectors? Soory im very new to this, but thank you guys for all the help

[Donkey]

Then found out he had the two 02 sensors unplugged and there was no 02 sensors on the other end?

Have no idea what your talking about. What other end? The WRX's only have 2 O2 sensors.

how do you fix it from running so lean? I wanna take off the MBC but I want to turn it back down to stock boost but im not sure how as there are no directions on the MBC. Also where do i find the diagnostic connectors? Soory im very new to this, but thank you guys for all the help

Take the car to a professional tuning shop that deals with Subarus. It needs a professional look over and probably a tune. Why did you buy a modded car that already had an issue?

[Wayn3 Zalenski]

Have no idea what your talking about. What other end? The WRX's only have 2 O2 sensors.
Take the car to a professional tuning shop that deals with Subarus. It needs a professional look over and probably a tune. Why did you buy a modded car that already had an issue?

Sorry what i ment was that both o2 were unplugged and nothing on the other end where the actual o2 sensor is where it goes into the exhaust, it was cut off. I bought with the knowledge of on the p0136 code, car is straight and clean with new tranny and motor swap with papers for what i think was a good price $7k. Im gonna make a video of what it does while i drive and ill make a link. thanks donkey

[Donkey]

A video isn't going to help. It needs the front O2 sensor and a professional look over. The front O2 sensor is a critical engine sensor. The car probably is not even tuned for those mods.