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Old 11-10-2019, 02:32 PM   #1
Scooby Newbie
Member#: 508214
Join Date: Nov 2019
Default Seating AVCS intake cams on ej255

Long time lurker, finally have somethign worth posting. I've searched NASIOC and subaruforester.org and found some stuff that helped me diagnose my problem I listed below but now my question is how do the AVCS intake cam sprockets seat? Should they slip over the dowels on cam easily with some lube and light hand pressure, or do you need to torque them for them to seat? One of my cam sprockets is damaged and needs replaced, however, if they should slip over those dowels easily, ill be replacing both cam sprockets.

My troubleshooting post from another forum is below for reference.

Fresh top end rebuild after HG blew. Spark on 2 and 4. No spark on 2 and 3. No CEL. Won't start

Swapped coils and plugs, no change. Per FSM pinned everything out and resistance is good. Counted teeth, timing dead nuts on. Pulled various sensors and throws CEL. Disabled AVCS and no change (banjo bolt filters were removed during overhaul).

Unplug both cam sensors, CEL and no change. Unplug one cam sensor, CEL and it goes into "batch firing" mode and tosses fuel and spark when any cylinder "approaches" TDC.

EJ255 exhaust sprockets are easy to align up with the keyd dowels, the AVCS intake sprockets suck my ass hole. The only thing I can come up with is the intake cam sprocket on one (or maybe both) cam is off. About to lock timing and pull the RH sprocket and hope to god its the one that's off.

Any thoughts? If you figure it out before me I'll buy you a case of beer.
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Old 12-01-2019, 11:11 AM   #2
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region: South East
Location: Florida
2005 WRX STi
Silver, Sexy 'n Raspy


There's quite a bit of info here, so I just want to hone in on the AVCS intake cam sprocket gear not lining up.

The dowel pin should just slip on without an issue, at least in my experience.

I would think that the dowel pin on the intake camshaft itself would be part to blame, but if you want to rule out the AVCS sprocket...

I sent my intake AVCS sprockets to Outfront motorsports to have them clean and inspect them since it's fairly complicated to deal with. I build my own motors but I didn't want to end up with a cam issue because I messed something up with the springs, etc.

Good luck man! I would have them inspect before buying all new sprockets since they are fairly expensive.
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