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Old 04-05-2014, 04:42 PM
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Engine running rough, no CEL light

2005 Subaru Legacy GT 2.5L turbo
So my mother starter her car in the morning and it was shaking like it has bad vacuum leak, there's no CEL. I know she filled up a couple days ago, maybe bad gas?
What could be causing this, where could I start checking?

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Old 04-06-2014, 01:35 PM
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Could be water in the fuel.Change the filter because it probably has never had one anyway, and carefully remove the old one and dump it into a bowl.
Look for water in the fuel. Go from there
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Old 04-06-2014, 02:30 PM
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Could be water in the fuel.Change the filter because it probably has never had one anyway, and carefully remove the old one and dump it into a bowl.
Look for water in the fuel. Go from there
There is no fuel filter on this car.
I do have P0320 code now, cylinder #2 misfire.
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Old 04-06-2014, 02:44 PM
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Exhaust valves are known to stretch in those, and they don't seat, causing a misfire and they will eventually heat up, and break off and lunch the motor.
Do some checking . Check the wiring to the coil and associated connections to the engine, check spark output from the coil, and do a compression test.
Don't mean to scare you but I had one a year or so ago that it happened to and dude kept driving. Busted a piston up bad. Destroyed the shortblock.
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Old 04-06-2014, 04:06 PM
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I;ve got spark plug and coil off the car, is there quick way to check it while I have it out of the car with multimeter?
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Old 04-06-2014, 04:22 PM
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Check the spark output with engine running.Air gap the wire at the coil end on the cylinder in question.Check another and compare.Use insulated plug wire plier so you don't get bit.
If you question the plug, just change it with a new one.Use the exact specified plug as those motors are finicky.
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Old 04-06-2014, 06:56 PM
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I inserted spark plug in coil and turned engine on and it has strong spark.
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Old 04-06-2014, 09:42 PM
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Is this part (circled in red) supposed to ground to the engine? It's metal and when I turned on engine it would send spark to engine if I held it close by.
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Old 04-07-2014, 08:03 PM
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Weird thing but I've swapped coils between cylinder 1 and 2 and reset CEL and then I turned on engine to see if CEL would come back. Car idled rough for 1/2 a minute or so and then started running great again!
I went to gas station and topped off tank (2.3 gallons) and its been running great on way back from gas station.
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Old 04-08-2014, 06:33 PM
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Youre lucky. It must have been a wet ignition. I guess it could also be a coil breaking down.Drive it a while , see if it comes back.
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Old 04-08-2014, 07:54 PM
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I was thinking more like case of bad gas
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Old 04-10-2014, 05:51 PM
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Well the code came back day later. Spark plugs are new oem spec NGK's.
I'm thinking about swapping injectors to check if injector might be bad?
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Old 04-10-2014, 06:01 PM
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Same cylinder? or did the misfire move with the coil when you moved it to a different plug?
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Old 04-10-2014, 07:09 PM
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Same cylinder? or did the misfire move with the coil when you moved it to a different plug?
Same cylinder. However car ran bad in the morning (yesterday) and ran great back from work when she drove it. I've reset CEL again last night and car has been driving great all day today.
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