Hello guys,

My accord started vibrating when on gear and vehicle is stopped (it started gradually not at once sha).

Although there’s no vibration when the car is in neutral.

I’ve changed the 5 engine seat at least once each, when you scan the check engine light it shows error P0420 (catalyst issues); so that cannot be the reason.

Can anyone recommend a solution as I’ve spent a lot trying to fix this vibration issue.

chiderajude:
Hello guys,

My accord started vibrating when on gear and vehicle is stopped (it started gradually not at once sha).

Although there’s no vibration when the car is in neutral.

I’ve changed the 5 engine seat at least once each, when you scan the check engine light it shows error P0420 (catalyst issues); so that cannot be the reason.

Can anyone recommend a solution as I’ve spent a lot trying to fix this vibration issue.

Does it fire well?

Catalyst fit don block breathing of the car.

Have panel remove and see since you don change engine seat.

Or check exhaust rubber hanger

homeboy205:



Does it fire well?

Catalyst fit don block breathing of the car.

Have panel remove and see since you don change engine seat.

Or check exhaust rubber hanger

It fires well, I really don’t think it has anything to do with the catalyst.
Also the exhaust rubber is still in place and looks pretty fine.

The vibration is only when the car is in drive, it doesn’t vibrate when in reverse.

chiderajude:


It fires well, I really don’t think it has anything to do with the catalyst.
Also the exhaust rubber is still in place and looks pretty fine.

The vibration is only when the car is in drive, it doesn’t vibrate when in reverse.

Did you do any work before this issue started?

Dozieson:


Did you do any work before this issue started?

Nope, started gradually.

chiderajude:


Nope, started gradually.

Have you scan the car for codes?

Dozieson:


Have you scan the car for codes?

Yeah, P0420 alone

chiderajude:


Yeah, P0420 alone

https://www.sundevilauto.com/reasons-your-car-is-vibrating-when-idle/

There some other reasons too:

1. Air filters
2. Vacuum leaks

Please read through the links.

But I suspect your engine seat more. You can ask someone to put the car through reverse,drive, neutral while you watch how the engine shakes

chiderajude:
Hello guys,

My accord started vibrating when on gear and vehicle is stopped (it started gradually not at once sha).

Although there’s no vibration when the car is in neutral.

I’ve changed the 5 engine seat at least once each, when you scan the check engine light it shows error P0420 (catalyst issues); so that cannot be the reason.

Can anyone recommend a solution as I’ve spent a lot trying to fix this vibration issue.

the catalyst can cause it but the likely cause Would be wrong idle speed due to multiple reasons. First on the list ,a leaky vacuum hose.normally that car should drop rpm to about 500 when you bring the car to a full stop(legs on brakes) anything significantly higher will make the car vibrate.

aAK1:
the catalyst can cause it but the likely cause Would be wrong idle speed due to multiple reasons. First on the list ,a leaky vacuum hose.normally that car should drop rpm to about 500 when you bring the car to a full stop(legs on brakes) anything significantly higher will make the car vibrate.

Bros calm down abeg ...no dey talk the tin wey pass your power


I own exact same car..and normal idle rpm should be between 650-750......the only time it does maybe 1200rpm and gradually lower is at cold start-up...

Anythin lower than 650-750rpm at normal idle will cause vibrations especially at that 500 you are taking about...in fact, I am very sure that at 500rpm, the car will vibrate fairly seriously..

And no...high idle rpm doesn't cause vibrations....the car will just become louder, hotter and guzzle more fuel ....the lower it gets below 650 at idle, the more the vibrations ...

buygala:


Bros calm down abeg ...no dey talk the tin wey pass your power


I own exact same car..and normal idle rpm should be between 650-750......the only time it does maybe 1200rpm and gradually lower is at cold start-up...

Anythin lower than 650-750rpm at normal idle will cause vibrations especially at that 500 you are taking about...in fact, I am very sure that at 500rpm, the car will vibrate fairly seriously..

And no...high idle rpm doesn't cause vibrations....the car will just become louder, hotter and guzzle more fuel ....the lower it gets below 650 at idle, the more the vibrations ...

what are you saying? I own the same car as well. The normal idle speed when in neutral is different from when the car is in gear and your leg is on the brakes . If your car is still hitting 650/700 when gear is engaged and your legs are on the breaks , it will vibrate. Let me share a little experience with you. I had to clean my throttle body some months back and because the ECU needed to relearn , my car was idling at 1,500 rpm. Apart from the car being unbearable to drive in place where I needed to drive slowly,it would vibrate at stops as long as the gear is engaged. You can’t be asking the car to go and stop at the same time and not expect vibration . Note that the op is likely not feeling any vibration when car is in idle or when car is in motion. It’s only when the car is not moving and gear is engaged

aAK1:
what are you saying? I own the same car as well. The normal idle speed when in neutral is different from when the car is in gear and your leg is on the brakes . If your car is still hitting 650/700 when gear is engaged and your legs are on the breaks , it will vibrate.

You win


As e be say u no wan hear word

Dozieson:


https://www.sundevilauto.com/reasons-your-car-is-vibrating-when-idle/

There some other reasons too:

1. Air filters
2. Vacuum leaks

Please read through the links.

But I suspect your engine seat more. You can ask someone to put the car through reverse,drive, neutral while you watch how the engine shakes

I’ve checked this thoroughly, no vacuum leaks, air filter is optimal too.

If at all there was a compromise with the air/fuel mixture, it’ll likely throw one of the P030x codes when you scan the vehicle, then if there was a vacuum leak the rpm will likely go up and down on its own.

aAK1:
the catalyst can cause it but the likely cause Would be wrong idle speed due to multiple reasons. First on the list ,a leaky vacuum hose.normally that car should drop rpm to about 500 when you bring the car to a full stop(legs on brakes) anything significantly higher will make the car vibrate.

Lol no the rpm doesn’t go as low as 500, it averages at 750. This has always been the normal level even when it didn’t have the vibration issues. Although some mornings it can get to 1200 but it drops in about 4-5 seconds.

chiderajude:


I’ve checked this thoroughly, no vacuum leaks, air filter is optimal too.

If at all there was a compromise with the air/fuel mixture, it’ll likely throw one of the P030x codes when you scan the vehicle, then if there was a vacuum leak the rpm will likely go up and down on its own.

Then, the likely cause is engine mount. You need yo check all again and identity the bad one

Uper and lower transmission mount is the culprit

So they loosened all the mounts, and it was discovered that the rear mounts was looking lower than usual, we replaced it.

Now it’s only vibrating a little (very little tho, it’s not noticeable), but it’s still not enough for me. When I drive my Camry, I don’t even feel any vibration.

Or is it just that accords are not as smooth as Camrys?

chiderajude:
So they loosened all the mounts, and it was discovered that the rear mounts was looking lower than usual, we replaced it.

Now it’s only vibrating a little (very little tho, it’s not noticeable), but it’s still not enough for me. When I drive my Camry, I don’t even feel any vibration.

Or is it just that accords are not as smooth as Camrys?

By the way, here’s a picture of the rear mount. Left is the bad mount whilst right is the tokunbo new mount.

chiderajude:


By the way, here’s a picture of the rear mount. Left is the bad mount whilst right is the tokunbo new mount.

Have you solved the problem?

Dozieson:


Have you solved the problem?

For me it’s not really solved, because it still has a little vibration. But the mechanic said it’s good. So I’ll just use it like that.

chiderajude:


For its it’s not really solved, because it still has a little vibration. But the mechanic said it’s good. So I’ll just use it like that.

Okay. What about the engine mount under the engine? And the mount holding the transmission under it?

Dozieson:


Okay. What about the engine mount under the engine? And the mount holding the transmission under it?

There’s just 4 mounts holding the engine (front, sides and back) and then 1 transmission mount under the gear.

They’ve all been checked and confirmed okay.

chiderajude:
Hello guys,

My accord started vibrating when on gear and vehicle is stopped (it started gradually not at once sha).

Although there’s no vibration when the car is in neutral.

I’ve changed the 5 engine seat at least once each, when you scan the check engine light it shows error P0420 (catalyst issues); so that cannot be the reason.

Can anyone recommend a solution as I’ve spent a lot trying to fix this vibration issue.

if you haven’t sold this car, I think I just discovered the likely problem. As I experienced the same thing you described. That Honda Accord 2009 has a active front mount. The mount mount is controlled by a vacuum line. It can be only 2 things. A leak on the line, or a leak in the front mount it’s self. Unfortunately the Nigerian mechanic will tell you nothing is wrong with it because the mount itself isn’t broken