Vibration under heavy acceleration
 

Hey all,

Just after a bit of advice. I know it is difficult to diagnose problems without seeing / feeling / hearing but I thought this may possibly be a common problem.

My car is a 99AP1 with 110k (kilometres) on the clock.

Recently, under heavy acceleration, particularly in second gear as I hit the vtec I can feel a vibration through the car which 'feels' like it could be from the rear. There is no noise associated with vibration at all and it only happens under HEAVY acceleration. It also happens in 3rd but is not as pronounced. I don't believe it is anything to do with hitting vtec, other than that is where the heaviest acceleration is.

Any possible suggestions? Diff?

Thanks in advance.

Ben

Probably pitted axle buckets. Are you lowered? Does it only happen when on the gas? If so that would be the most likely culprit. If it is only speed related then probably a wheel balancing or tire issue.

Thanks mate. Yeah lowered on PSS9. Only happens under acceleration and is not speed related.

Could I ask what axle buckets are? I find it strange that it does not happen at any speed, only under very hard acceleration (full throttle).

Yes that is most likely the axle buckets then. They get pitted over time and when you lower the car they don't stay in the same groove so they kind of wobble I guess which causes that vibrations during acceleration. It is a very common issue with these cars. You can swap the axle buckets to the other side of the car so they make new grooves to sit in which should eliminate or at least reduce the vibrations.

:iagree: I had to do the swap after I was lowered for a long while and went back to stock.

Thanks for the info guys. I'll look into that.

Only catch is that I am pretty sure the vibration was there before it was lowered. Does this change anything?

Can still get worn out at stock height. Still put my money on that.

Ok, sweet. Getting it checked tomoz.

Is this also the same prob that a driveshaft spacer would fix?

Just had it looked at. Any chance a drive shaft spacer could help solve the problem?

Yes a spacer would fix it as well.