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Old 08-31-2012, 08:07 PM   #1
myrexgoesvroom
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Join Date: Jun 2010
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2002 Swag Wagon
PSM

Default EJ251 Swap wont start.

Car: 2000 OBS originally equipped with a Phase II MAP based SOHC EJ22.

Donor: 2001 Forester Phase II SOHC EJ251, also MAP based.

EJ22 ECU
EJ251 Engine Harness
EJ251 Intake Manifold

Fuel pump is working, and fuel is entering the fuel rails from the filter.
New spark plugs all around, all 4 plugs are getting spark.

Everything is hooked up 100% except the Air Assist Solenoid seen here:


Currently I have a hose connecting the two ports but no solenoid. Seeing as I'm using the EJ22 ECU I shouldn't need it. *as far as I know*

Here's a quick video of it cranking. You can hear it stop cranking, then continue. That is not me, the car was doing that on it's own. It also let out a couple back fires you might not be able to hear.


Any ideas?
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Old 08-31-2012, 10:49 PM   #2
yarrgh
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Did you check timing before install? Are the spark plugs wet with fuel? What happens if you crack the throttle ever-so-slightly when cranking?
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Old 08-31-2012, 11:12 PM   #3
myrexgoesvroom
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Timing is good to go. Spark plugs are dry and giving it a bit of gas doesn't do anything.

Thank you for the response
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Old 08-31-2012, 11:21 PM   #4
dscoobydoo
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Slowly walk your hands all over the intake manifold checking the wires. My 2000 OBS has a sensor in the airbox I do not see in yours.
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Old 09-01-2012, 12:01 AM   #5
myrexgoesvroom
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Good eye! That would be the air temp sensor. I would imagine it's important, but I don't think it would keep the car from running would it?
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Old 09-01-2012, 12:19 AM   #6
RaceFaceXC
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Can you log the ecu? Chk the crank and cam sensor for signal. Thought they were for ignition timing trigger only but worth a shot. Chk them for installation and connection to the harness, too
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Old 09-01-2012, 12:25 AM   #7
myrexgoesvroom
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Hmm. Would it have something to do with the cam/crank gears? I'm thinking there might be a difference in timing triggers between the motors. Going to try an ECU from an 00 RS 251 car and see if that does the trick.
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Old 09-01-2012, 10:26 AM   #8
yarrgh
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If the cam/crank sensors jive, you will get spark (which you're seeing). You said that that spark plugs are NOT wet (you did check just after cranking didn't you), which means the ECU isn't telling the injectors to fire. Troubleshoot that path. I don't know enough about the differences/similarities on the EJ22/25 ECUs to tell you much more. Have you tried starter fluid?
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Old 09-01-2012, 12:34 PM   #9
myrexgoesvroom
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Haven't tried started fluid yet. I didnt think that worked on fuel injected cars. Ill def give it a shot.

Oh, and I replaced the plugs after trying to crank it a few times but did not check them immediately after trying to crank it.

Also, it seems the EJ22 timing belt has less teeth then the 251. If that's the case the cam/crank triggers are probably different as well.

Swapping ecu tonight and ill update.

Last edited by myrexgoesvroom; 09-01-2012 at 12:55 PM.
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Old 09-02-2012, 06:08 AM   #10
jeffsnyder
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i would say check to see if the crank sprocket and the cam pulley are different.

i had a problems with mine not starting because of the differences

i did basically the same swap, but my 2.5 was from a manual transmission rs and i had different timing components

i also swap intakes manifolds, i used the original 2.2 one
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Old 09-02-2012, 10:38 PM   #11
myrexgoesvroom
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It was the cam/crank difference. I swapped the ECU and she fired right up. It's running pretty rough so I'm not sure if the ECU actually fixed the issue or bandaged it though. Have to put a scanner on it tomorrow to check CEL's and find out.
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Old 09-03-2012, 08:52 PM   #12
myrexgoesvroom
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Ok went and got the codes pulled.

Codes:
Idle Air Control Solenoid
- P1512 (signal 2 circuit low input)
- P1514 (signal 3 circuit low input)
- P1516 (signal 4 circuit low input)

P1111
P1111 Atmospheric Pressure Sensor High Input

I don't have an APS as far as I can tell. If I do it's in the ECU. I cleaned the IACV with carb/choke cleaner and a q-tip with no luck. I unplugged the MAP and bam, smooth idle and returned drivability. Since the codes are for the IACV I assume mine is bad and removing the MAP puts the car in "limp" mode and the ECU ignores the bad IACV.

Sound about right?

Changed the IACV for a used one from a friends RS. Now the idle surges between 1500-1700. Drivability is up, but still terrible.
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Old 09-03-2012, 10:04 PM   #13
mod maniac
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I would change the crank gear, intake manifold and engine harness to the ej22 stuff and use that computer. Then everything should hook up and work.
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Old 09-03-2012, 10:21 PM   #14
myrexgoesvroom
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That's what every one keeps saying heh... Is it really possible it's an issue at this point? I'm using an EJ251 Engine, harness, and ECU. Everything should be as it would have been in the car it was removed from right?
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Old 09-04-2012, 12:39 AM   #15
mod maniac
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Its alot more work to do it that way but it can be done. Go for it.
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Old 09-04-2012, 12:49 AM   #16
myrexgoesvroom
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I'm already using the EJ25 ECU and it's running, it just runs rough. The codes I posted a few posts up are what I'm getting.
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