Autobox clonk
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- Patrolman
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Autobox clonk
Guys, when I've been driving at speed and coast to a stop at an open road intersection, just before I come to a dead stop, there is a single clonk as the box shifts down; ie a slightly harsh downshift. Is that normal? A new 4.8 GRX.
- David
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Re: Autobox clonk
Hi Clem.
Mine also did it from day one. I think it is related to the idling speed and it's behavior changes with your driving style.
Try coasting in slowly before you come to a stop.
Check out this link: Thud
You can also try resetting the TCU by unplugging it over-night and by adjusting your timing to 10 degrees advance as yours are more than likely still a factory stock 5 degrees.
Must say it is quite an unrefined clunk
Let us know if that helps
Mine also did it from day one. I think it is related to the idling speed and it's behavior changes with your driving style.
Try coasting in slowly before you come to a stop.
Check out this link: Thud
You can also try resetting the TCU by unplugging it over-night and by adjusting your timing to 10 degrees advance as yours are more than likely still a factory stock 5 degrees.
Must say it is quite an unrefined clunk
Let us know if that helps
2006 Patrol 4.8 GRX Tiptronic Y61/GU(4)
ARB Bullbar, BZT rear bar, TJM 2" Suspension, Snorkel, LT 285/70/17 BFG KO2's, 40L Engel
Stop Rhino Poaching Supporter!
ARB Bullbar, BZT rear bar, TJM 2" Suspension, Snorkel, LT 285/70/17 BFG KO2's, 40L Engel
Stop Rhino Poaching Supporter!
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- Patrolman
- Posts: 902
- Joined: 19 Jun 2013 15:16
- Full Name: Clem Daniel
- Nickname: Clem
- Home Town: Johannesburg
- Current 4x4: Patrol 4.8
- Home Language: English
- Has thanked: 35 times
- Been thanked: 37 times
Re: Autobox clonk
Many thanks for the input David. I'm not sure about the aircon thing - will monitor but I think in my case I did not have it on, but I could be mistaken. The TCU is the transmission control unit? Maybe I can just disconnect the man in batty overnight instead? 5 degrees advance on the engine timing? If that's all it has I probably really should get it changed - obviously set to cope with really low grade fuel (?).David wrote:Hi Clem.
Mine also did it from day one. I think it is related to the idling speed and it's behavior changes with your driving style.
Try coasting in slowly before you come to a stop.
Check out this link: Thud
You can also try resetting the TCU by unplugging it over-night and by adjusting your timing to 10 degrees advance as yours are more than likely still a factory stock 5 degrees.
Must say it is quite an unrefined clunk
Let us know if that helps
- David
- Patrolman
- Posts: 723
- Joined: 17 Dec 2009 12:42
- Full Name: David Prinsloo
- Nickname: David
- Home Town: Stellenbosch
- Current 4x4: 2006 Patrol 4.8 GRX
- Home Language: Afrikaans
- Location: Stellenbosch
- Has thanked: 2 times
- Been thanked: 48 times
Re: Autobox clonk
You can do so but it is actually very easy to disconnect the TCU.
Stick your head under the dash drivers side. It is mounted below the radio. It has a lever that flips open and then the connections can be removed.
If you disconnect the battery your radio will ask for a code and you will have to reset all the stations
David
Stick your head under the dash drivers side. It is mounted below the radio. It has a lever that flips open and then the connections can be removed.
If you disconnect the battery your radio will ask for a code and you will have to reset all the stations
David
2006 Patrol 4.8 GRX Tiptronic Y61/GU(4)
ARB Bullbar, BZT rear bar, TJM 2" Suspension, Snorkel, LT 285/70/17 BFG KO2's, 40L Engel
Stop Rhino Poaching Supporter!
ARB Bullbar, BZT rear bar, TJM 2" Suspension, Snorkel, LT 285/70/17 BFG KO2's, 40L Engel
Stop Rhino Poaching Supporter!
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