Forums / The Garage / thumping changing down to 1st

C6owners :: Forums :: C6 Support :: The Garage


thumping changing down to 1st	Please Register to enjoy additional Member Benefits

Author

Post

bargi

Thu Mar 22 2018, 10:03pm

Joined: Apr 10 2016

Member No: #2590

Location: London

3.0 Petrol 50k miles.

Recently noticed when pulling up, there's a noticeable thump when it shifts down to first. No that it's a loud sound, just you can really feel it engage and the car feels like it lurches just slightly.

It's had a transmission flush within the last 2 years and one of the engine mounts changed. (like this one)

I'm tempted to change the transmission mounts(s) and other engine mounts before trying another flush or the dreaded valve body change

I'm struggling to find a service manual anywhere with Google
Can anyone point me towards details of the mounts and their locations?

Hattershaun United Kingdom

Thu Mar 22 2018, 10:45pm

Joined: Dec 19 2010

Member No: #320

Location: Bedfordshire, UK

Evening Ray,

If you’ve been predominantly driving in town and/or gently then the gearbox 'auto-adaptive' ECU may have adapted accordingly, thereafter the gearbox changes can appear a bit snatchy
It could well benefit from an 'Italian tune-up' to alter the gear shift programming.

I’d suggest a decent drive on open roads, when you can accelerate meaningfully with plenty of engine revs as a start. Then another partial change or two of gearbox oil & check with the Lexia for any stored faults in the ECU's memory. Then take it from there.
By all means bring it to B.L. Autos for a test drive and check over.
All the best, Shaun.

C6Dave United Kingdom

Fri Mar 23 2018, 09:39am

Joined: Oct 01 2009

Member No: #1

Location: Northumberland

bargi wrote ...

I'm struggling to find a service manual anywhere with Google
Can anyone point me towards details of the mounts and their locations?

In the Tech Docs Section: - Click Here -

Screen Grab of it:

You need to download and open for the part number and description list.


Jump: Back to top User Colour Key: Head Administrator, Administrator, C6 owner, Technical Expert, C6 Premier Discount Club