bentegrity
New member
Hey everyone, I’ve been through countless misfire threads on here and other forums and can’t seem to figure out mine.
Car is a 2012 Golf R with APR Stage 2+ tune, along with all supporting mods.
Car currently has 142,5xx miles.
Running a pcv delete.
Changed spark plugs and swapped coils with no change.
Motor was rebuilt at around 100k miles due to losing compression in a cylinder due to a split second money shift. In the rebuild, I added APR’s valve train upgrade.
The misfire only appears to happen under heavy load after 4k rpm, and only when the car is attempting to reach full boost. I can sort of sneak the car’s rpm to over this with no issue, but as soon as the load increases to where boost wants to go all the way, it stutters like fuel cut from traction control kicking on or something.
Over the time I’ve had the issue, it has only thrown an actual misfire code once. All other times the only way I could see it is via live data from my obdeleven pro.
At this point, my intuition has me eyeing three things to consider:
First, a compression test. Seeing as Ive been through it before with this car, I’m hoping I have other things to try before this. While I feel confident that the motor “feels” fine in all other circumstances aside the above, I don’t actually know if that’s logical or not.
Second, a bad injector. As far as I can tell, they’re the originals. But based on what I read, I would presume a fuel related code would pop up but none have. Are there channels I can see live that would indicate an issue with an injector?
Third, a boost or vacuum leak. I have a pcv delete that has basically made the related issues go away since the rebuild. I don’t hear any noise that sounds like an obvious leak but I also don’t hear the whoosh from the DV as prominently, though I assumed that’s because the fuel was being cut due to conditions. Could totally be off though.
If anyone has any suggestions on which direction to go based on the above, I would greatly appreciate it!
Car is a 2012 Golf R with APR Stage 2+ tune, along with all supporting mods.
Car currently has 142,5xx miles.
Running a pcv delete.
Changed spark plugs and swapped coils with no change.
Motor was rebuilt at around 100k miles due to losing compression in a cylinder due to a split second money shift. In the rebuild, I added APR’s valve train upgrade.
The misfire only appears to happen under heavy load after 4k rpm, and only when the car is attempting to reach full boost. I can sort of sneak the car’s rpm to over this with no issue, but as soon as the load increases to where boost wants to go all the way, it stutters like fuel cut from traction control kicking on or something.
Over the time I’ve had the issue, it has only thrown an actual misfire code once. All other times the only way I could see it is via live data from my obdeleven pro.
At this point, my intuition has me eyeing three things to consider:
First, a compression test. Seeing as Ive been through it before with this car, I’m hoping I have other things to try before this. While I feel confident that the motor “feels” fine in all other circumstances aside the above, I don’t actually know if that’s logical or not.
Second, a bad injector. As far as I can tell, they’re the originals. But based on what I read, I would presume a fuel related code would pop up but none have. Are there channels I can see live that would indicate an issue with an injector?
Third, a boost or vacuum leak. I have a pcv delete that has basically made the related issues go away since the rebuild. I don’t hear any noise that sounds like an obvious leak but I also don’t hear the whoosh from the DV as prominently, though I assumed that’s because the fuel was being cut due to conditions. Could totally be off though.
If anyone has any suggestions on which direction to go based on the above, I would greatly appreciate it!