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Drive 'Shunt' on auto 3.5 petrol

UserPost

10:45
April 16, 2011


V5 WTF

Guest

1
4

Hi chaps,

I have had this issue since I purchased the car. Basically, at start up there is quite a significant 'shunt' from Park to Drive. If you go from Park to Reverse there is no issue. At traffic lights, if I engage Neutral or Park then go into Drive I get it as well – so it's not just from cold. When it is very cold there is no shunt…..when it gets hotter the shunt can be significant.

Trawling all forums 'Renault' and 'Nissan 350' or 'VQ engine' there seems to be a mixed bag of reviews.  To be honest, the car drives faultlessly when on the move – smooth, intelligent (it now has 'learnt' my driving style and I can drive hard or soft with tiptronic or full auto and the car responds accordingly as I like…).  

I have had the gearbox oil checked – fine. The car has a FSH with Renault (recently serviced) and is in pretty good fettle. I just know that this kind of shunt should not be prevalent on a car that cost £32k new, has only 55k miles on it with FSH.  I do have a warranty on him (wile Wink) so…

  • Is it a gearbox issue?
  • Is it a torque box/converter issue?
  • Is it 'common place' on this particular auto box (peculiar to the 3.5 model I understand – the box on the diesels are different I believe…Izuzu units like the engines?)

 

Any help/advice/thoughts welcome Smile

 

Dave

10:58
April 16, 2011


Team

UK

Admin

posts 604

2
0

Hi Dave,

After having researched the shunt (or jolt or jerk as some call it) issue with my own 3.0 Vel Satis' gearbox, I feel the same as you in that it's unlikely to be the gearbox oil (ATF – automatic transmission fluid), but it would certainly be nice if it was low/dirty ATF oil after all, as it would be by far the cheapest fix.

I used to know and regularly see a very knowledgeable Renault Technical Expert RTE who was convinced that the jolt was caused by either the solenoid or the hydraulic distributor. Renault apparently released a technical document to their mechanics about it, years ago, and suggested that the hydraulic distributor be changed.

It costs about £1,000 though and even a very robust warranty will lilkely only pay out for complete gearbox failure, not just an inconvenient, annoying symptom which hadn't worsened in a long time. Mine's done it for years. It's actually got slight better lately though! One thing I did find that lessened the jolt was if I gently dabbed the throttle just before shifting into D, as it builds up the pressure slightly, lessening the 'bang'.

Apart from the above, I don't really know any more – but I'm pretty sure the 3.0 and the 3.5 Vel Satis models both use the 5-speed Aisin Warner (Toyota-related) SU1 gearbox (officially the AF-33).

Vel-Satis.org Chief Administrator & Founder

13:27
April 16, 2011


Rosic

Guest

3
0

I had the same thing in my automatic Safrane – I change the oil and problem gone.

Check as well as simple thing as gearbox mounting.

13:30
April 16, 2011


V5 WTF

Guest

4
0

Team said:

Hi Dave,

After having researched the shunt (or jolt or jerk as some call it) issue with my own 3.0 Vel Satis' gearbox, I feel the same as you in that it's unlikely to be the gearbox oil (ATF – automatic transmission fluid), but it would certainly be nice if it was low/dirty ATF oil after all, as it would be by far the cheapest fix.

I used to know and regularly see a very knowledgeable Renault Technical Expert RTE who was convinced that the jolt was caused by either the solenoid or the hydraulic distributor. Renault apparently released a technical document to their mechanics about it, years ago, and suggested that the hydraulic distributor be changed.

It costs about £1,000 though and even a very robust warranty will lilkely only pay out for complete gearbox failure, not just an inconvenient, annoying symptom which hadn't worsened in a long time. Mine's done it for years. It's actually got slight better lately though! One thing I did find that lessened the jolt was if I gently dabbed the throttle just before shifting into D, as it builds up the pressure slightly, lessening the 'bang'.

Apart from the above, I don't really know any more – but I'm pretty sure the 3.0 and the 3.5 Vel Satis models both use the 5-speed Aisin Warner (Toyota-related) SU1 gearbox (officially the AF-33).


Thanks Olly…..I am hoepful it will just remain as 'annoying' and not get worse. I will try to track down the factory recall notice on the VS across the boards so we can post to the forum. Dave

22:34
April 16, 2011


Team

UK

Admin

posts 604

5
0

This may be useful Dave… an Avantime owner I know has just emailed me saying "The lurching gearbox problem is caused by not allowing the unique "clutch" on these gearboxes engage automatically BEFORE applying the accelerator. Some I know take longer to engage after releasing the footbrake than others but if it engages at higher revs the resulting jolt can be quite dramatic. If you don't feel the clutch engage, simply put your foot on the brake pedal and release again."

Are you like me in that you're comparatively gentle with the gear shifter/selector, and you pause a few seconds between pressing down on the brake pedal and pulling the level from Park into Drive? Maybe I should just pull the level immediately back with no respectful hesitation, as my dad does this in his Vel Satis and has never felt the shunt-jolt. Worth a try?

Vel-Satis.org Chief Administrator & Founder

10:20
April 17, 2011


R9UKE

Guest

6
0

My 3.0 dV6 always did, and still does this.  It had me worried at first, but after speaking with plenty of people (including Oliver) about it, I found it to be a little Renault quirk to live with.

 

Oh and I drove a 2002 Laguna 3.0 V6 the other day.  It did exactly the same.  Oh and by the way…. What a car!! Laugh

14:08
April 17, 2011


Team

UK

Admin

posts 604

7
0

Post edited 14:09 – April 17, 2011 by Team


It seems almost all automatic Renaults do the jolt/jerk/shunt then!

I've dug out a Technical Note PDF that my Renault Technical Expert (RTE) friend sent me a while ago, regarding this gearbox jolt.

The document is called 4465A, entitled GREEN TECHNICAL NOTE and dated JUNE 2006.

It states that this document cancels and replaces Technical Note no. 4465A dated MARCH 2006, and applies to BJ0 X chassis with the SU1 automatic transmission.

It is designed to address "Customer complaint: Thudding noise when the selector lever is moved from position N to D or N to R."

Below, it lists: "Possible cause: Clogging of the hydraulic distributor LS and LT solenoid valves (pressure regulation solenoid valves) by particles suspended in the automatic transmission oil."

I won't and can't post the full PDF as it's Copyright Renault, so I'm currently awaiting their permission to give a copy to parties who could benefit from it. Or you can try and get a copy yourselves. Hope the above info is of some use though.

Vel-Satis.org Chief Administrator & Founder

13:39
April 19, 2011


V5 WTF

Guest

8
0

Fantastic thoughts and responses here chaps – just shows you what great value a club like this can bring to owners Cool

Back to UK on Thursday so will try the tips and tricks advised above to see if it improves – if not, as someone has said above, I'll just accept it as an annoying trait…..

Thanks again! Dave

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