My GF has a 2007 Accord four cylinder, automatic, with about 103k miles.
The issue is that the car vibrates noticeably at idle when in gear (D or R), and the vibration is even worse when the a/c is on. I have found that a cold engine does exacerbates the issue, and the vibration is worse in reverse than in drive.
I have driven two different Accord four-cylinders of the same generation (one was a 03, another was 04) and both had significantly more miles -- but both had zero vibration under the same condition.
So far, I have done/verified the following:
- Did a "power brake" test - found no significant rips/tears at the front hydraulic mount or at the rear mount. The front mount does have some slight weather-related cracking, but there are no obvious rips or tears. The rear mount is quite difficult to fully inspect with the bracket still on, but from what I can tell, it looks like it is in good shape. I'm not sure how I would verify a "collapsed" mount.
- Inspected the side mount and found no issues.
- Used a block of wood and a floor jack to lift the rear of the transmission while the car is in gear, and this resulted in only a slight reduction in the vibration.
- Tried to test the function of the dual-mode front mount by increasing the engine rpm to 1,000 - found noticeably more cabin vibration at 1,000 rpm than at 800....so I think the dual-mode function is working properly.
- Performed a valve clearance adjustment, slight improvement in idle quality but no significant changes.
- Performed a complete transmission service using Genuine Honda ATF-DW1, no change.
My understanding is that the front and rear mounts are the load-bearing mounts on this vehicle. Based on what I've seen, the front mount sees the most stress when in D (the engine tilts upward) while the rear mount sees more stress in R (engine tilts downward).
I have done a lot of searching on the forums but have not found any conclusive answers. There is a TSB out for the 03-04 models to replace the front mount (and inspect the rear) as a solution for correcting excessive vibration at idle, but the 07 in question already has the updated mount listed.
I would like to get some additional ideas/opinions before I drop $215 on new front and rear mounts - it feels like I'm just guessing at this point.
Thanks in advance.
The issue is that the car vibrates noticeably at idle when in gear (D or R), and the vibration is even worse when the a/c is on. I have found that a cold engine does exacerbates the issue, and the vibration is worse in reverse than in drive.
I have driven two different Accord four-cylinders of the same generation (one was a 03, another was 04) and both had significantly more miles -- but both had zero vibration under the same condition.
So far, I have done/verified the following:
- Did a "power brake" test - found no significant rips/tears at the front hydraulic mount or at the rear mount. The front mount does have some slight weather-related cracking, but there are no obvious rips or tears. The rear mount is quite difficult to fully inspect with the bracket still on, but from what I can tell, it looks like it is in good shape. I'm not sure how I would verify a "collapsed" mount.
- Inspected the side mount and found no issues.
- Used a block of wood and a floor jack to lift the rear of the transmission while the car is in gear, and this resulted in only a slight reduction in the vibration.
- Tried to test the function of the dual-mode front mount by increasing the engine rpm to 1,000 - found noticeably more cabin vibration at 1,000 rpm than at 800....so I think the dual-mode function is working properly.
- Performed a valve clearance adjustment, slight improvement in idle quality but no significant changes.
- Performed a complete transmission service using Genuine Honda ATF-DW1, no change.
My understanding is that the front and rear mounts are the load-bearing mounts on this vehicle. Based on what I've seen, the front mount sees the most stress when in D (the engine tilts upward) while the rear mount sees more stress in R (engine tilts downward).
I have done a lot of searching on the forums but have not found any conclusive answers. There is a TSB out for the 03-04 models to replace the front mount (and inspect the rear) as a solution for correcting excessive vibration at idle, but the 07 in question already has the updated mount listed.
I would like to get some additional ideas/opinions before I drop $215 on new front and rear mounts - it feels like I'm just guessing at this point.
Thanks in advance.