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Old 03-03-2014, 04:10 PM   #1
WRteXan
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Member#: 223894
Join Date: Sep 2009
Chapter/Region: TXIC
Location: Sugaru Land
Default No spark after swap

Short:
Are there any differences in the cam/crank sensor pickup/teeth between late model USDM and JDM engines? I know the EJ205, 207, 255, and 257 are interchangeable. The sensors are the same as well as the teeth on the crank timing gear and cams. What about the JDM models though? Are the spark plugs fired off the crank gear, and the cam gear sensors are just to close the loop on AVCS advance, or if the cams are different, will it not fire at all?

Long:
A friend had a 2005 baja turbo with knock. Didn't have alot of money nor time to wait for rebuild. Ended up buying a JDM EJ20. It has intake AVCS just like the factory motor, but it was a non-turbo motor. Swapped the intake and exhaust manifolds, added bungs for turbo to passenger (right) head. swapped over necessary plumbing to get it all together.. excluding the unbaffled CCV. The non-turbo motors don't have the unbaffled CCV piping like the EJ255, EJ257, and EJ207. Not a big deal, as he doesn't plan on running boost. I planned on just making a bracket to hold the WG open. He really doesn't care about power, just getting the car back on the road. I got it all put in and it won't fire. Cranks, is getting fuel, but no spark, nada, not even a sputter. If I need to change the timing for the higher compression motor, i can do that, but I'd think it would at least fire, sputter, or something. I have more testing to do, but was curious if anyone know about changes to the gear teeth or what not. Any other causes for not firing? There were no wiring changes as the manifold was swapped. I did use the JDM sensors on the block/heads, but they appear identical to the USDM ones that were on his motor. They plugged right in as well. No splicing.
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Last edited by WRteXan; 03-03-2014 at 04:28 PM.
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Old 03-25-2014, 03:18 AM   #2
paul hogan
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Join Date: Aug 2013
Location: Reno, NV
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2002 WRX Wagon
WRB

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didn't read the long but maybe i can be of some help. i just did a jdm ej205 into usdm chassis. i used usdm intake manifold. i also had to swap over the metal crank gear due to the teeth that the sensor reads and metal cam gear due to the marks on the backside of the gears where the sensor reads it (both gears APPEAR to be same but when you compare them they are far from it.) swap those, retime, fire up pm me if you have any questions, i'd be happy to try and help out!
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Old 03-25-2014, 09:59 AM   #3
JoshP
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Location: S. Maine
Default

What the.....

.......
..
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Okay did you look at the cam or crank gears for the timing points? The JDM motor may have the older style with less points on the crank and more on the cam.

Other than that, dude wtf??? literally
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Old 03-25-2014, 10:00 AM   #4
JoshP
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Heres a pic of the potential differences :

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Old 06-05-2014, 09:55 AM   #5
WRteXan
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I'm not sure about the WTF???

If those are the only versions of crank timing belt pullies, then I'm ok there. I knew about those not being interchangeable, I just wasn't sure if they did something special for the JDM models. The donor engine was an 04 JDM Legacy N/A with AVCS. I swapped the manifold from the baja as the JDM NA manifold has too many difference. The cam gears won't matter much as I have AVCS and the cam sensor reads the cam itself, not the pulley. The next question is if the cams are the same as far as the sensor pick up is concerned. The cams have the same lift and duration according to the FSM's I've looked at. Could they still be a different profile?

After several months of me avoiding this disaster, I took a look at it last night. I replaced the crank sensor. No spark. I checked voltage at the crank sensor and something like 1.4V referenced to battery negative. The coil packs are gettting ground and 12V but never a signal to fire. I didn't pull it apart enough to check the cam sensors. I did copy/adjust the timing maps from the donor car (2004 JDM Legacy NA) and loaded them in. That wouldn't be the cause of NO spark though, just possibly too much advance in the stock map for the higher compression motor.

As for firing the coil packs (which are from the baja, not the donor), what all is needed to make them fire? All of the wiring is from the baja, the crank sensor is now from the baja. I will change out the cam sensors from the baja in a few days.

Last edited by WRteXan; 06-05-2014 at 10:01 AM.
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Old 06-06-2014, 11:46 PM   #6
Rianuale
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world rally blue

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I'm thinking it's a ground issue and everything else is right. Make sure the intake manifold especially has a good ground.
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