05 2.5rs backfired and shut down - Subaru Impreza GC8 & RS Forum & Community: RS25.com
 
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05 2.5rs backfired and shut down
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Old 06-06-2019, 03:04 AM   #1
fuhr31
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Default 05 2.5rs backfired and shut down

Friend was driving his impreza backfired and shut down. Now cranks but won't start. Changed coil pack and one plug/wire as previous owner had wrong wire on it. Battery is good. Checked timing and looks spot on. There are no codes present either. Car seems like it is cranking slower than I'm used to on a subaru but I've also never messed around with an auto one before. All fuses good. Haven't had a chance to see if fuel pump is priming or not yet.

Assuming timing is right, like I said looks spot on but was running out of daylight.
Other possible causes,
Fuel pump or relay, maybe ecu, or possible wiring issue. I did look over the harness and wiring looks good.
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Old 06-06-2019, 09:38 AM   #2
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Shouldn't you be able to hear the fuel pump priming with the key in the on position?
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Old 06-06-2019, 09:48 AM   #3
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run a compression test
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Old 06-06-2019, 07:09 PM   #4
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First pull the two outer timing covers, line those gears up to their marks by manually turning the crank with a socket, then see if the crank damper mark lines up with the tdc mark on the center cover. Otherwise, you're wasting your time trying to take wild guesses.

If the mechanical timing is actually ok, THEN start worrying about other checks.
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Old 06-07-2019, 05:35 AM   #5
fuhr31
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Timing covers were off when we we're looking at it. Drivers side did look a little off like maybe a half a tooth to a tooth max. But yesterday with more daylight when I was rotating by hand could spin everything about half a rotation on crank and it hit something, valves I assume. Didn't do that the day before when I was rotating it by hand I could rotate it fully around multiple times. I'm just wondering if tensioner failed and rotating it by hand made it skip more to get the interference the next day.

I am completely expecting the worse and hoping for the best haha. If valves got bent than hopefully that's the only damage once I get it torn down. I do have an extra set of heads to go on that motor if it is just the valves bent.
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Old 06-07-2019, 05:55 AM   #6
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Take the spark plugs out so you aren't fighting compression as you go around, will make it more apparent if there is a physical touch. My timing belt tensioner failed and took all 16 valves with it.
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Old 06-07-2019, 12:29 PM   #7
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Just started pulling plugs and the one blew up. So clearly it left stuff in the cylinder. Trying to upload a pic but says it exceeds megabyte limit.
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Old 06-07-2019, 02:11 PM   #8
fuhr31
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Whatever happened with the plug blew a hole in the piston. Or the rod let loose and went up into the plug.
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Old 06-07-2019, 09:26 PM   #9
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FOD. foreign object damage. drop a valve maybe?
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