16weeks, Yes thats weeks, and......It's Now Fixed.......... :D - Page 5

Dragrad · 10th June 2008, 23:19

Quote:

Originally Posted by JohnDotCom

What ever happened to getting a soldering iron out and actually repairing it instead of changing Boards?

Probably a SMT capacitor

Besides it's easier to change a board than to use a soldering iron.

Who does repairs anymore? All these old time skills are disappearing, especially in the car mechanics/electrics field. If you can't replace an item it ain't fixable

Dragrad · 10th June 2008, 23:21

WHO CHANGED THE HEADING OF THIS THREAD?

Whatever.. Thank you

MGOracle · 10th June 2008, 23:31

Odd, you can check the caps during cranking on a bosch diagnostic machine.

This happened to me but would never stop the car once driving, only from starting. Bascially the caps charge and fire a pulse to the injectors. The caps then do nothing until the next time the car is started. This would certainly explain why they thought all 4 injectors were shot.

ECU doctor couldnt repair it but its worth a go with yours. If they cant repair it, you dont pay.

New ECU and session on T4 for me was £650,

As I said earlier, it was always going to be either the ECU or the High Pressure regulator seal. I bet they havent checked that yet.

Dragrad · 10th June 2008, 23:35

Quote:

Originally Posted by MGOracle

Odd, you can check the caps during cranking on a bosch diagnostic machine.

This happened to me but would never stop the car once driving, only from starting.

ECU doctor couldnt repair it but its worth a go with yours. If they cant repair it, you dont pay.

New ECU and session on T4 for me was £650,

As I said earlier, it was always going to be either the ECU or the High Pressure regulator seal. I bet they havent checked that yet.

They told me today that the pressures are now OK,

They seemed fairly confident that all that was left to do was repair the ECU....... I'm not holding my breath.........

Except for the bill, I'm looking forward to getting into her again

JohnDotCom · 11th June 2008, 07:28

Quote:

WHO CHANGED THE HEADING OF THIS THREAD?

Whatever.. Thank you

I changed the Name of Thread to keep up with the length of your Current Dilemma.
Er...I can put it back to 3 weeks if it sounds less Painful.

Keith · 11th June 2008, 19:21

New board? I don't buy that at all be careful get an idea of how much this "board" is going to cost before they fit it please, better still get the part number so we know what they mean.

There are capacitors used to fire the injectors but a simple T4 session would have highlighted if the voltage they produce was at fault bottom two in this picture from my T4 on my CDT saloon

Dragrad · 11th June 2008, 19:48

Quote:

Originally Posted by Keith

New board? I don't buy that at all be careful get an idea of how much this "board" is going to cost before they fit it please, better still get the part number so we know what they mean.

I was told it would be substantially cheaper than an ECU. How much, got no idea. As I said three weeks ago, I'm beginning not to care as to cost. I just want her back, up and running. It sounds like they are almost there, and I should be getting the car back soon. I must admit that getting definitive information out of any of the garages she's been to is very difficult.

Getting hold of the people working on her to try and get the info, is difficult as I only have a linch hour the same as they do. And making phone calls from work is most frowned upon, even if I could find the time.

So I'm just hoping that the ordeal will soon be over,,,,,,,,,,

Departed · 11th June 2008, 20:06

Quote:

Originally Posted by MGOracle

This happened to me but would never stop the car once driving, only from starting. Bascially the caps charge and fire a pulse to the injectors. The caps then do nothing until the next time the car is started. .

Don't know about this one, but that's not how they work on the TD5 land rover engine:-

Because the injectors aren't like on a petrol engine they need to work hard. 12v is not enough to make them operate hard enough and fast enough. So there's an inverter power supply to give more volts. This charges the capacitors up, which are used to fire the injectors, all the time. If these capacitors fail, then there's not enough juice to power the injectors.

Those capacitors are fairly big and you can see the bulge in that ECU.

I believe the Bosch system to be the same, but don't know, and the T4 readings of 70 ish volts seem to back it up. There could be lot's of other possible reasons for failing only at startup, one of which could be the change in supply voltage from 12v to 14v when running.

MGOracle · 11th June 2008, 21:27

no you're right, but I must clarify what I meant. They are stable at around 70v permanently but need to be far higher than this during cranking. They then settle to around 70v for their cycle.

For instance, my caps would quiet happily sit at 70v when tested but during cranking where getting nowhere near the required voltage.

Dragrad · 12th June 2008, 21:04

Oh well, not getting her back this week

However they do have another 75 CDT there with the same problem ( I know no more than this).

I've faxed them everything you good guys have sent or posted, so all I can do know is sit and wait,... and wait... and......

10th June 2008, 23:21	#42
Dragrad This is my second home *None DROWNED** Join Date: Aug 2007 Location: Cardigan Posts: 33,339 Thanks: 1,257 Thanked 1,664 Times in 1,081 Posts	WHO CHANGED THE HEADING OF THIS THREAD? Whatever.. Thank you __________________ Andrew Ich Dien Problem solving is... lateral thinking SEARCH FIRST ...ASK LATER...

12th June 2008, 21:04	#50
Dragrad This is my second home *None DROWNED** Join Date: Aug 2007 Location: Cardigan Posts: 33,339 Thanks: 1,257 Thanked 1,664 Times in 1,081 Posts	Oh well, not getting her back this week However they do have another 75 CDT there with the same problem ( I know no more than this). I've faxed them everything you good guys have sent or posted, so all I can do know is sit and wait,... and wait... and...... __________________ Andrew Ich Dien Problem solving is... lateral thinking SEARCH FIRST ...ASK LATER...

10th June 2008, 23:31	#43
MGOracle Banned MG ZT CDTi 135+ Join Date: Mar 2007 Location: Cardiff Posts: 1 Thanks: 0 Thanked 5 Times in 2 Posts	Odd, you can check the caps during cranking on a bosch diagnostic machine. This happened to me but would never stop the car once driving, only from starting. Bascially the caps charge and fire a pulse to the injectors. The caps then do nothing until the next time the car is started. This would certainly explain why they thought all 4 injectors were shot. ECU doctor couldnt repair it but its worth a go with yours. If they cant repair it, you dont pay. New ECU and session on T4 for me was £650, As I said earlier, it was always going to be either the ECU or the High Pressure regulator seal. I bet they havent checked that yet.

11th June 2008, 19:21	#46
Keith This is my second home ZT400 Join Date: Oct 2006 Location: Ellesmere Posts: 5,948 Thanks: 0 Thanked 43 Times in 29 Posts	New board? I don't buy that at all be careful get an idea of how much this "board" is going to cost before they fit it please, better still get the part number so we know what they mean. There are capacitors used to fire the injectors but a simple T4 session would have highlighted if the voltage they produce was at fault bottom two in this picture from my T4 on my CDT saloon

11th June 2008, 21:27	#49
MGOracle Banned MG ZT CDTi 135+ Join Date: Mar 2007 Location: Cardiff Posts: 1 Thanks: 0 Thanked 5 Times in 2 Posts	no you're right, but I must clarify what I meant. They are stable at around 70v permanently but need to be far higher than this during cranking. They then settle to around 70v for their cycle. For instance, my caps would quiet happily sit at 70v when tested but during cranking where getting nowhere near the required voltage.