Thread: Must read for TDCi owners

Pat,
I also noted an improvement in low speed throttle inputs once closing the EGR via BAS (no ECU remap just an EGR close).
During the pump learn process following remap my VCV took a few times to learn.
Dave suggested that is an early indicator for VCV failure.
I have pencilled in a pre-emptive strike on the VCV and after your good report might bump it up the list.

Did you source and install the part? I have seen them readily available from the UK for part (LR009837) however I would prefer a Denso or Genuine LR unit if Im going to do the swap?

S

I've also found front bump stop clearance to be a factor in drive line clunk. With and ARB bar and winch on the front of my 110 the bump clearance dropped to ~70mm. I fitted the LR HD springs which raised the clearance up to ~105mm. The car went from easy to drive, relatively clunk free, to an absolute pig.

After doing a bit of maths I settled on Les Richmond Automotive's "Rangie Pink" springs. These brought the clearance back to (stock) ~90mm and the car is back to it's old easy to drive self.

It amazes me how much this small 15mm lift made to the driveability, (I know that's not a word Ron! ).

Cheers,

Originally Posted by roverrescue

Pat,
I also noted an improvement in low speed throttle inputs once closing the EGR via BAS (no ECU remap just an EGR close).
During the pump learn process following remap my VCV took a few times to learn.
Dave suggested that is an early indicator for VCV failure.
I have pencilled in a pre-emptive strike on the VCV and after your good report might bump it up the list.

Did you source and install the part? I have seen them readily available from the UK for part (LR009837) however I would prefer a Denso or Genuine LR unit if Im going to do the swap?

S

I had the denso model fitted,I didn't do it as I don't have the software to do the pump learn,I also looked at getting the EGR closed via a remap. Pat

What/where is the VCV please guys?

Originally Posted by YOLO110

What/where is the VCV please guys?

Volume Control Valve but am still not much wiser about it.

I didn't know either so I had to Google it - got a lot of hits talking about and endorsing what Pat posted.

Is this issue more likely in the 2.4s as opposed to the 2.2s or is it the same in both?

Sent from my SM-G925I using AULRO mobile app

Yolo
From the Manual VCV is part of the low pressure fuel system

The transfer pump draws fuel out of the fuel tank through the fuel inlet (8). The pump internal pressure is adjusted through the admission-pressure control valve (6), ensuring that sufficient lubrication and cooling are always provided for the high-pressure pump components. The excess fuel is transferred to the inlet side of the transfer pump (7) through the admission-pressure control valve, with a portion of the fuel being transferred to the VCV (5) from the transfer
pump. The fuel quantity delivered to the high-pressure chambers is determined by the opening cross-section of the VCV. The small restriction bore in the fuel overflow valve (14) provides for automatic bleeding of the high-pressure pump. The entire low-pressure system is designed to allow a defined quantity of fuel to flow back into the fuel tank through the overflow pressure regulator tube, which assists cooling of the high-pressure pump.
A total of 2 high-pressure chambers (1 and 2), each with a pump plunger (3), are used for high-pressure generation. The drive for the pump plungers is through an eccentric cam (11), which is in turn driven by the drive shaft (12). The high-pressure pump permanently generates the high system pressure for the fuel rail.

Originally Posted by PAT303

Just a bit more important info for owners,as we all know the TDCi is renowned for it's clunking drive train and originally all the blame fell on the P38 diff,since owning mine I've found the axle flanges and adapter shaft to be the bigger issue,I've now found another cause,the VCV.Our TDCi started with the hunting idle and stalling a few weeks ago which just happened to be when I noticed the drive line slack had returned,I've been doing a bit of Perth driving and it is crap to put it nicely,I could not drive it smooth.Well I've just returned from Perth with a new VCV fitted and guess what,never had a single clunk the whole way.I've always put up with the little hesitation off idle with my engine because that seemed to be a TDCi trait but it's not,it's that little cough that causes the loading/unloading of the drive train that then causes the cur-clunk every time you change gear.I'd strongly advise that if you find you cannot smoothing drive away from idle and you have a 2.4 I'd look at replacing the VCV,it is a known fault that will need to be replaced anyway so I'd do it now,the smoothness of my engine is chalk and cheese compared to two days ago. Pat

Cheers Pat,

Having read your post thats my defender to a tee hunting then stalling and trying as i might for a smooth gear change its just not happening.