It’s the third part of our series on Honda vibration and time to cover the causes of vibrations while the engine is climbing in RPMs — and gets worse the quicker the RPMs shoot up. This is an easy and hard problem to cover, mainly because there’s two causes. Diagnosing which system is the problem is simple part of the series, so let’s jump right in!
A motor mount that is broken or has collapsed will cause a vibration when the engine speed changes. In addition, broken or loose engine accessories or drive belts that are worn or loose can also cause this type of vibration. Basically, If anything is making contact with the chassis, you can experience a vibration.
You can rule out a motor mount by looking at the areas between the engine, exhaust, transmission and transaxle if you do not notice any signs of contact like shiny spots or scuffs. You can pry up on the engine, transaxle or transmission to check the integrity of the mounts.
Torque twists on a RWD vehicle can tear the rubber insulator on the left motor mount. You would also hear a clunk during hard acceleration or when you put the transmission into gear if this is your issue.
FWD vehicles that have a transverse-mounted engine will see the torque twist in the upper torque strap. Between heat, oil contamination and vibration, it is not uncommon to see the rubber bushings deteriorate. Then you will have a shaking, rattling and bucking engine upon acceleration and shifting. These engines significantly roll during hard accelerations, so broken motor mounts are just par for the course.
Also, a loose bolt on the torque converter of the automatic transmission will create an imbalance that will increase as the RPMs increase. You can check this by dropping the bellhousing inspection plate and cranking the engine. You will be able to see missing or loose bolts.
When your engine is struggling to reach higher RPMs, it will cause it to shake, and these vibrations can be felt throughout the car. For many of the same reasons mentioned in part two, the engine will also cause vibrations, to recap from that article, the causes are typically:
- Worn spark plugs
- Fried spark plug wires
- Damaged valves
- Clogged fuel filter
- Bad fuel pump
- Clogged transmission filter
Please visit part two for further explain of these mechanical issues, but the most likely culprit is related to the mounts, so check those out before moving on to anything else. Also, check out our tips from part 1 if you are having additional issues.