Hi everyone,
I recently had to replace a neglected J35A8 with 227K in my RL due to oil consumption that led to a burnt valve on Cyl #5. I sourced a 60K mile engine and installed it myself. I was also getting codes for the rear cat before the swap, so I decided to buy the RV6 HFPC kit and replace both of them. After pulling the old engine, I found that the side, front and rear engine mounts were broken, so I replaced them. I did not touch the transmission mount, though I left the trans in the car when I pulled the motor. Now that everything is together and I've driven it for a week, I noticed (on day one) that there is excessive vibration/noise at low RPMs and low rpm 5th gear cruising. What do you think the issue could be? do the HFPCs cause that much of an exhaust note change that I can feel and hear it in the car? I equate the vibration/noise to that of my old CRX with a b series swap on Hasport poly bushing mounts. It was very loud from the vibration, but I expected and enjoyed it since it was purpose built to go fast and be fun.
The car runs and shifts great otherwise and I don't hear this noise outside of the cabin area. There's no knocking noise like something is hitting the sub-frame or anything. It's just so drone-y compared to what it was before. I'd like to get it back to the very quiet operation that it was before, but I cannot for the life of me, find the source of my problem. I hope someone can confirm if the RV6 cats cause the low RPM noise or if they would not and if the new motor mounts could cause it, due to a break-in period. I doubt it's the mounts though.
I recently had to replace a neglected J35A8 with 227K in my RL due to oil consumption that led to a burnt valve on Cyl #5. I sourced a 60K mile engine and installed it myself. I was also getting codes for the rear cat before the swap, so I decided to buy the RV6 HFPC kit and replace both of them. After pulling the old engine, I found that the side, front and rear engine mounts were broken, so I replaced them. I did not touch the transmission mount, though I left the trans in the car when I pulled the motor. Now that everything is together and I've driven it for a week, I noticed (on day one) that there is excessive vibration/noise at low RPMs and low rpm 5th gear cruising. What do you think the issue could be? do the HFPCs cause that much of an exhaust note change that I can feel and hear it in the car? I equate the vibration/noise to that of my old CRX with a b series swap on Hasport poly bushing mounts. It was very loud from the vibration, but I expected and enjoyed it since it was purpose built to go fast and be fun.
The car runs and shifts great otherwise and I don't hear this noise outside of the cabin area. There's no knocking noise like something is hitting the sub-frame or anything. It's just so drone-y compared to what it was before. I'd like to get it back to the very quiet operation that it was before, but I cannot for the life of me, find the source of my problem. I hope someone can confirm if the RV6 cats cause the low RPM noise or if they would not and if the new motor mounts could cause it, due to a break-in period. I doubt it's the mounts though.