Multiple Misfires

[racedoll]

I'll try to make this short.

 

End of January - CEL - misfire cylinder 4

Coil pack and plug replaced

Mid Feb - CEL - misfire cylinder 4

Before I get to mechanic CEL starts flashing, sounds horrible was 1 mile from shop

No compression, ends up having a burnt valve, engine pulled, heads redone, also found some other issues with cam phasers, replaced O2 sensor, got back together and continue to receive CEL

 

Misfire cylinder 1 for mechanics before returning car to me, reset

I got car back, misfire cylinder 1 - replaced coil pack and plug one this and 2, 3 cylinder so now all are new

 

I get car - CEL misfire 3 & 4 return to mechanic, not sure what they did, received CEL again, return they drive for a week without issues, I get back and light comes on almost instantly for me, this time cylinder 1 & 3.

 

One of the 3 & 4 misfired smelled of raw fuel, O2 reading .86-.90 volts

 

I suggested replacing fuel injectors but with misfire moving, I'm stumped. Any ideas? I want my car fixed and back, this has been ongoing for 3 months.

 

 

It could be I'm jinxed too... Borrowed a couple cars and tensioner /serpentine belt broke on me, got fixed and then water pump went on me. The other car I borrowed got a flat tire because TPMS sensor broke on me and it's part of valve stem. Now my truck's CEL comes on with 1/4 tank fuel left. I'm so over vehicle issues...ugh.

[NORULZleggy]

First of what type of cars, year make and model? Also if this is an LGT or N/A Legacy, you need to find a true Subaru shop if you are not there. never take my car to a non subie shop. They either work on nothing but subaru/build them. Do not jus throw parts at it and replace all the pack and plugs at one time. do not piece mill it. That is cutting corners in my book. Also replace both 02 sensors.

[Max Capacity]

Make sure to use Denzo O2 sensors.

 

 

Only use NGK spark plugs, gapped at 0.027-0.030" if its a GT.

 

Make sure the coil wire connectors are clean and tight. Some have found them loose.

 

When I do my plugs, I leave the coil connector attached, you don't need to remove it to get the coil off the plug.

[racedoll]

Oops. Sorry about the lack of information.

 

2009 Legacy GT 5spd manual just tripped 160K during all this crap.

 

I had taken to the dealer until recently. The work had severely degraded so I refused to go back to them.

 

O2 sensor is Subaru, they had used some aftermarket but changed it, but didn't matter.