swapped '03 2.0 engine into an '04 wrx model, failed emissions - now what? - Subaru WRX Forum
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#1 Old 12-02-2013, 05:01 PM
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swapped '03 2.0 engine into an '04 wrx model, failed emissions - now what?

So I have a 2004 WRX complete Stock. It has 250K on the odometer. We put in a used '03 2.0 engine (75000 miles when installed) because the original engine died at 220K.

Now I just failed emissions (state of Virginia) and my car registration is over in 3 days. I'm getting 4 codes:

p0447 - evaporate emission control system vent control circuit open
p0457 - evaporate emission system link (fuel cap loose/off)
p0420 - Catalyst System Efficiency below Threshold (bank 1)
p1491 - ??? something to do with pcv valve with the 03 engine and the ecu.

Money is incredibly tight. State of Virginia allows for waivers if i make repairs exceeding $780...

I went to the dealership about 8 months ago, and they said the fact that I used a 03 engine in my 04 model was going to cause some issues with emissions. Fortunately I kept my old engine for parts.

Should I go to dealer? To qualify for a waiver, the repair work must be done at a VA certified emissions repair facility. My subaru dealership is not...

I just need some guidance on a point of attack here.
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#2 Old 12-02-2013, 05:16 PM
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Damn 780$ for a waiver! In pa it's only 150.


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#3 Old 12-02-2013, 06:59 PM
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Here in El Paso, I just take mine to Paco, and it always passes.

Maybe you have a Paco around where you live?
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#4 Old 12-02-2013, 07:01 PM
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I am the paco where I live lol. It's very nice having my emissions and inspection license for pa


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#5 Old 12-02-2013, 08:17 PM
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Just swapping motors isn't going to change anything emissions wise, you obviously didn't hook everything up correctly. Take those codes and look at those emissions devices to make sure they are hooked up correctly...

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#6 Old 12-03-2013, 07:22 PM
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I've read about someone doing the same swap and having the same evap issues due to the harness/ecu differences, can't remember the specifics though.
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#7 Old 12-03-2013, 07:30 PM
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The ECU is different, but that has nothing to do with the shortblock, they are the same.

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#8 Old 12-03-2013, 07:49 PM
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Yeah, but all he said was that he swapped motors, he didn't say anything about the harness or ECU. If i remember correctly the guy used an 03 harness with a 04 ECU, and thats what caused the issues.
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#9 Old 12-03-2013, 08:06 PM
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If he kept the same heads and wiring harness. Then what is the difference? A short block is a short block. Just a case, crank, rods, pistons, and bearings. The whole bottom end is the same. The difference lies in the ECU, wiring harness, and heads in different years.

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#10 Old 12-03-2013, 08:11 PM
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Originally Posted by Brockton View Post
Yeah, but all he said was that he swapped motors, he didn't say anything about the harness or ECU. If i remember correctly the guy used an 03 harness with a 04 ECU, and thats what caused the issues.
Are you sure your even posting on the right thread?

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#11 Old 12-03-2013, 08:20 PM
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Are you? He's not having issues with his short block, he's having issues with the evap systems not working properly.

Quote:
So I have a 2004 WRX complete Stock. It has 250K on the odometer. We put in a used '03 2.0 engine (75000 miles when installed) because the original engine died at 220K.
He said he swapped the motor, and he failed emissions, which are managed by the ecu via sensors that run into the harness. The harness and ECU has differences between the 02/03 and 04/05 years. He didn't put any details of how he did the swap, which harness and ecu he used, and this can cause issues with how the evap systems communicate with the ECU if its not done correctly.
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#12 Old 12-03-2013, 08:27 PM
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...and as I stated the shortblock isn't the issue...I told him where to go check so lose the attitude son.

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#13 Old 12-03-2013, 08:36 PM
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If he kept the same heads, wiring harness, and ECU then he hooked something up wrong. End of Story.

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#14 Old 12-03-2013, 08:36 PM
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And I said nothing about the short block

ME: I've read about someone doing the same swap and having the same evap issues due to the harness/ecu differences, can't remember the specifics though.

YOU: The ECU is different, but that has nothing to do with the shortblock, they are the same.

^I said nothing about the short block

ME: Yeah, but all he said was that he swapped motors, he didn't say anything about the harness or ECU. If i remember correctly the guy used an 03 harness with a 04 ECU, and thats what caused the issues.

I'll match attitude with attitude. Of course i'm posting on the right thread, but you're obviously not following what i'm saying.
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#15 Old 12-03-2013, 08:42 PM
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If he's cash strapped...something tells me he isn't swapping long blocks. So, it sounds like a short block swap out to me. I guess the OP needs to respond to say what he really has done. Which, I doubt he's even returning at this point.

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