H6 1,3,5 misfire fixed vvt solenoid – subaru outback – subaru outback forums

Was getting a misfire code for cylinder 1,3 and 5 bank 1. Plugs were due so I changed them and swapped a couple coil packs to the other bank and misfires did not move banks. I read the VVT solenoid valve is a likely suspect. There are two for (bank 1) and same for (bank 2) in the cylinder heads front and rear. The misfires were happening more frequently and car progressively started to run worse and misfires could be felt even before a CEL was thrown for misfires. Engine was not smooth and at times jittery/jerky, especially in stop and go traffic. I changed out the front VVT passenger side and wow, what a difference. Car is smooth, shifts are tight again and engine is dialed. The VVT has progressively gotten worse over the last 6 Mo’s and caused the timing to be really off.


As mentioned, prior to this I changed my plugs, swapped coil packs to other side, checked grounds and connections but kept coming up short. Not sure if it’s fixed but currently no dash lights and car is running normal again. Amazing how when performance is gradually lost you do not realize how bad it was until it is restored. Thought I would post this if anyone else gets a misfire on 1, 3, 5 or 2, 4, 6 banks.

Tip: On my 09 3.0 fronts are the same, so you can swap them and see if the codes move to the other bank. The rears are a different part number. Part I used was 10921AA050. Paid little over 80 bucks at the dealer with a nice discount. I hooked a 9 volt to the solenoid on the old part and the plunger does move but it must have been shorting/malfunctioning at times throwing the cam angle/timing way off.

Was getting a misfire code for cylinder 1,3 and 5 bank 1. Plugs were due so I changed them and swapped a couple coil packs to the other bank and misfires did not move banks. I read the VVT solenoid valve is a likely suspect. There are two for (bank 1) and same for (bank 2) in the cylinder heads front and rear. The misfires were happening more frequently and car progressively started to run worse and misfires could be felt even before a CEL was thrown for misfires. Engine was not smooth and at times jittery/jerky, especially in stop and go traffic. I changed out the front VVT passenger side and wow, what a difference. Car is smooth, shifts are tight again and engine is dialed. The VVT has progressively gotten worse over the last 6 Mo’s and caused the timing to be really off. As mentioned, prior to this I changed my plugs, swapped coil packs to other side, checked grounds and connections but kept coming up short. Not sure if it’s fixed but currently no dash lights and car is running normal again. Amazing how when performance is gradually lost you do not realize how bad it was until it is restored. Thought I would post this if anyone else gets a misfire on 1, 3, 5 or 2, 4, 6 banks.

Tip: On my 09 3.0 fronts are the same, so you can swap them and see if the codes move to the other bank. The rears are a different part number. Part I used was 10921AA050. Paid little over 80 bucks at the dealer with a nice discount. I hooked a 9 volt to the solenoid on the old part and the plunger does move but it must have been shorting/malfunctioning at times throwing the cam angle/timing way off.