CDTi non start - solved (again). All diesels owners should take a look really.

MGOracle · 10th October 2007, 19:41

so, as some of you may remember I posted a month or so back about a problem whereby the car didnt start, but it would run with easy start.

The problem then vanished, then came back, etc, etc

Well, on Saturday, I went to start the car and it wouldn't start or run with easy start.

Once again, the seal in the HP control regulator valve had been shot away. This is the second time in 63k miles (112k on the clock now).

These 63k have all been with Rons Synergy and I'd like to see if I have covered the highest mileage with a Synergy fitted.

The seal has gone twice in the last 10 months (first time in January at 75k miles).

Most redeeming feature now is that I am not doing 1000 miles a week, so hopefully the car will run for a good few years now!!!!

Andyb123 · 10th October 2007, 19:46

What is a HP control regulator valve? and were is it located on the cdt engine.

MGOracle · 10th October 2007, 19:54

Hi,

The HP pump is located on the front left hand side (looking in the engine bay) below the inlet tracts.

The regulator sits to the right and up a little bit and keeps the pressure regulated to 660bar (I think).

If the seal deteriorates or blows through the HP pump can't be regulated and fuel will not get through to the car. Now, I don't know if this is mechanically biased or if an electronic fail safe stops the car (as it would start with easystart unless the seal was really really bad).

If the car does not start, no fault codes are logged (which leads me to think its mechanically impossible for the fuel to get through), and the pressure from the HP pump will have to be checked.

grivas · 10th October 2007, 21:26

Hi MGORACLE,
I read your post with great interest, but are you suggesting that the HP control regulator seals are damaged by a Synergy or similar TUB unit some how? I am concerned if this were so, what setting are you running at?
Sorry to sound worried.

JohnDotCom · 10th October 2007, 21:31

I have now done 62000 miles with a remap and Ron's synergy and to date have had no problems caused by it I am pleased to say.
Run on settings 7 to 10. or 5 when plodding around.

MGOracle · 10th October 2007, 22:42

Quote:

Originally Posted by grivas

Hi MGORACLE,
I read your post with great interest, but are you suggesting that the HP control regulator seals are damaged by a Synergy or similar TUB unit some how? I am concerned if this were so, what setting are you running at?
Sorry to sound worried.

No, although I am wondering if it *may* be a contributing factor.

Accordingly, the new M47 range (in the BMW Line which sees upto 163bhp) uses a new model HP pump (fittings are the same) with a better seal in the regulator which is why I am wondering.

tempest grey · 11th October 2007, 07:47

I fitted my Synergy at 28000 miles last September.
Now have 48000 on the clock with no problems.
I have the Pierburg MAF and usually use setting 6, also have the aluminium flexi pipe in place of the standard air intake.
I'll monitor things though, and tempting fate no problems so far.

10th October 2007, 19:41	#1
MGOracle Banned MG ZT CDTi 135+ Join Date: Mar 2007 Location: Cardiff Posts: 1 Thanks: 0 Thanked 5 Times in 2 Posts	CDTi non start - solved (again). All diesels owners should take a look really. so, as some of you may remember I posted a month or so back about a problem whereby the car didnt start, but it would run with easy start. The problem then vanished, then came back, etc, etc Well, on Saturday, I went to start the car and it wouldn't start or run with easy start. Once again, the seal in the HP control regulator valve had been shot away. This is the second time in 63k miles (112k on the clock now). These 63k have all been with Rons Synergy and I'd like to see if I have covered the highest mileage with a Synergy fitted. The seal has gone twice in the last 10 months (first time in January at 75k miles). Most redeeming feature now is that I am not doing 1000 miles a week, so hopefully the car will run for a good few years now!!!!

10th October 2007, 19:46	#2
Andyb123 Loves to post Rover 75 2L CDT Conn Se HiLine SATNAV Join Date: Nov 2006 Location: Wrexham Posts: 299 Thanks: 0 Thanked 1 Time in 1 Post	What is a HP control regulator valve? and were is it located on the cdt engine.

10th October 2007, 19:54	#3
MGOracle Banned MG ZT CDTi 135+ Join Date: Mar 2007 Location: Cardiff Posts: 1 Thanks: 0 Thanked 5 Times in 2 Posts	Hi, The HP pump is located on the front left hand side (looking in the engine bay) below the inlet tracts. The regulator sits to the right and up a little bit and keeps the pressure regulated to 660bar (I think). If the seal deteriorates or blows through the HP pump can't be regulated and fuel will not get through to the car. Now, I don't know if this is mechanically biased or if an electronic fail safe stops the car (as it would start with easystart unless the seal was really really bad). If the car does not start, no fault codes are logged (which leads me to think its mechanically impossible for the fuel to get through), and the pressure from the HP pump will have to be checked.

10th October 2007, 21:26	#4
grivas I really should get out more....... Rover 75 CDT Club Tourer Join Date: Nov 2006 Location: Milky Way Posts: 2,380 Thanks: 105 Thanked 513 Times in 382 Posts	Hi MGORACLE, I read your post with great interest, but are you suggesting that the HP control regulator seals are damaged by a Synergy or similar TUB unit some how? I am concerned if this were so, what setting are you running at? Sorry to sound worried.

10th October 2007, 21:31	#5
JohnDotCom * Rover 75 FaceLift Tourer CDTi 170BHP Auto ConnSE 2005 Model Starlight Silver Join Date: Nov 2006 Location: Abergele Posts: 28,735 Thanks: 0 Thanked 6 Times in 5 Posts	I have now done 62000 miles with a remap and Ron's synergy and to date have had no problems caused by it I am pleased to say. Run on settings 7 to 10. or 5 when plodding around.

11th October 2007, 07:47	#7
tempest grey Newbie None at the moment Join Date: Jul 2007 Location: Nottingham Posts: 29 Thanks: 0 Thanked 0 Times in 0 Posts	I fitted my Synergy at 28000 miles last September. Now have 48000 on the clock with no problems. I have the Pierburg MAF and usually use setting 6, also have the aluminium flexi pipe in place of the standard air intake. I'll monitor things though, and tempting fate no problems so far.