Jerky on/off throttle - drivetrain slack?

[veevee]

I've been driving a friends (fwd) car all weekend and it's noticeably jerky coming on and off the throttle, the clutch doesn't seem to be slipping, it feels like riding a bike with a slack chain. What is the likely cause, and us there anything that can be done to sort it?

[andy-xr]

Could be anything from fuel to flywheel weight

[MG CHRIS]

What car. If its a clio rear gearbox mount wear and cause that problem. Or tell friend to be smother on and of throttle.

[P I Staker]

My 106 does this, fairly sure its an engine/gearbox mount but haven't diagnosed it yet.

[Big_Dog]

Does the gearstick move around a lot as well? If so odds on it's an engine or gearbox mount. Assuming it hasn't got millions of miles on it.

[BFG TERRANO]

engine mounts, slop in the diff/box... or just erratic use of the go pedal?

[J4CKO]

I had a car do that, was the pin in the middle of the diff, I booted it and it let go, split the box in half !

[veevee]

BFG TERRANO said:

engine mounts, slop in the diff/box... or just erratic use of the go pedal?

I'm going with gearbox/engine mounts, and how dare you question my driving skills.

[StottyZr]

P I Staker said:

My 106 does this, fairly sure its an engine/gearbox mount but haven't diagnosed it yet.

Exactly what I was about to type.

[SuperchargedVR6]

If it's a VW, then definitely 100% engine mounts.

[Kozy]

Another vote for engine mounts.

[Eighteeteewhy]

Kozy said:

Another vote for engine mounts.

SuperchargedVR6 said:

If it's a VW, then definitely 100% engine mounts.

[GAjon]

A faulty coil pack can produce these symptoms also.

[Life Saab Itch]

P I Staker said:

My 106 does this, fairly sure its an engine/gearbox mount but haven't diagnosed it yet.

Zey all do zis Monsieur, eet iz a feature, not a fault.

[P I Staker]

Life Saab Itch said:

P I Staker said:

My 106 does this, fairly sure its an engine/gearbox mount but haven't diagnosed it yet.

Zey all do zis Monsieur, eet iz a feature, not a fault.

Is that the same for the rear brakes that need readjusted every three weeks?

[BFG TERRANO]

veevee said:

I'm going with gearbox/engine mounts, and how dare you question my driving skills.

Didn't question anyone's driving skills. Erratic use of the go pedal my post said? Some of the worlds best drivers have erratic use of the gas. Rally drivers for one.

If you took the view that it was questioning your driving skills you have misunderstood.

View it as throttle techniqe.

Friends of mine with all makes and model of cars and powers have this all or nothing use of the go pedal. Doesn't mean they have low driving skills either.

[veevee]

BFG TERRANO said:

veevee said:

I'm going with gearbox/engine mounts, and how dare you question my driving skills.

Didn't question anyone's driving skills. Erratic use of the go pedal my post said? Some of the worlds best drivers have erratic use of the gas. Rally drivers for one.

If you took the view that it was questioning your driving skills you have misunderstood.

View it as throttle techniqe.

Friends of mine with all makes and model of cars and powers have this all or nothing use of the go pedal. Doesn't mean they have low driving skills either.

OK, I'll re-phrase: how dare you question my throttle technique.