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Old 08-27-2019, 01:02 PM   #1
Soosh
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Default Fuel and spark in one cylinder

So I have 2013 STi which I've now rebuilt twice in the last couple of months. Long story short, I spun a rod bearing and rebuilt my engine with a short block from Subaru. My oil pump failed a week after the rebuild and I was back to square one. We (my mechanic buddy, my mechanic dad and I) had taken the block apart and replaced all of the bearings and parts that were needed.

We got the block back in the car, fired it up without the accessories on (alternator, a/c, etc.) and it started like a dream. Sounded great. We put all of the accessories back on and the car idled real rough and stalled out and now won't start anymore. We checked compression, timing, sensors, coil packs and they all seem to check out fine. We tested fuel and spark and noticed that only cylinder 1 is getting spark and fuel. I fear that my ECU is fried but after many talks with other subie owners and chats with techs at dealers, I'm sure that an ECU wouldn't blow from anything that I would have done. After hours and hours of yelling at my car for a while I've decided to come here.

Does anyone have any idea what could cause fuel and spark to only one cylinder??
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Old 08-27-2019, 01:19 PM   #2
Turn in Concepts
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Crank trigger sprocket. See if any teeth are broken off.
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Old 08-27-2019, 02:11 PM   #3
Soosh
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I don't think it's the crank sprocket. I check that when we triple checked timing...
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Old 08-27-2019, 03:53 PM   #4
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I just re-read it, and I'm stumped withotu looking at it. My first inclination would be something to do with either cam or crank positions sensor.
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Old 08-27-2019, 09:25 PM   #5
Mattdg67
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Double check all the engine grounds, it can cause some weird issues when they're loose or disconnected.
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