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Jerky Acceleration

b4 turbo driveshaft jerky clutch gearbox mounts liberty legacy rsk

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#1 RSK20

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Posted 18 March 2013 - 06:36 PM

My car is very jerky on acceleration and deceleration in a super-sensitive way that I can't smooth out. It's not so much a clutch-engagement issue (as far as I can tell) as it is a throttle issue. When I let off the accelerator in gear, the driveline is noticeable thumpy and jerky. When I accelerate in gear it jerks again. It's far more pronounced in lower gears/revs, especially in stop and go traffic. Car has a new clutch, and the gearbox oil had been replaced. Is this likely to be a problem with the universal joints in the driveshaft?

UPDATE: A new MAF sensor made a world of difference.

#2 nickknack

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Posted 18 March 2013 - 08:41 PM

Engine mounts? Mine does the same thing but it's not very bad.

#3 Jordan

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Posted 18 March 2013 - 08:46 PM

Its not misfiring?

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#4 Morgan

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Posted 18 March 2013 - 09:01 PM

Coils?

IM47Gcv.jpg


#5 Guest_KONG_*

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Posted 18 March 2013 - 09:13 PM

You mentioned a thump noise.

It could be a great many things.... CV's, bushes, worn or loose suspension components, mounting points, uni's .

Do you think the jerky feel is a result of engine performance/tuning or some point of the drive train failing?

Also where does the thumping noise come from front or rear or mid?

Is it like a shudder when the clutch is released or definite "THUMP" ?

#6 RSK20

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Posted 18 March 2013 - 10:13 PM

Not so much a thump, no noise, more just a slight unavoidable shudder. Initially though it was a sketchy clutch/flywheel, although is also happens before and after the clutch is released. Possibly misfiring/coil issues, but only at low revs under 2k rpm (or perhaps just slower speeds).

#7 glenisanutter

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Posted 18 March 2013 - 10:20 PM

The best way around this is to stab the clutch as you are gassing it up...Enjoy the AWD Launch :D

#8 Guest_KONG_*

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Posted 18 March 2013 - 10:39 PM

Try tightening up the exhaust gas contol actuator on the secondary turbo.
Anti clockwise ;)





Also tagged with one or more of these keywords: b4, turbo, driveshaft, jerky, clutch, gearbox, mounts, liberty, legacy, rsk

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