Mystery breakdowns - any ideas? - Page 2

Horntourer · 17th May 2007, 16:46

JDC - many thanks for your continued interest in this.

Among the possible causes suggested were an intermittent fault with the cam or crank sensor, one injector with intermittent leak back, the pressure regulator solenoid on the HP pump sticking or underbonnet pump jamming.

The solutions Ron suggested included using Millers Diesel Plus in the fuel and
getting a can of switch/contact cleaner and spraying the engine sensor contacts - cam sensor, fuel rail sensor and if possible, the crank sensor.

To date I have used the Millers Diesel Plus, and acquired a can of contact cleaner. I've used a couple of tanks of diesel with the Millers in it and it seems to me that the car goes a bit better (although since fitting the Synergy unit it has always been good).

However, my problem is that there appears to be no clear cause for the problem, and it has only happened twice in a year, so I have no way of knowing what works and what does not. For example, the absence of the problem for the next six months would not confirm that the pressure regulator solenoid had been jamming and now does not because of the treatment.

I will shortly be cleaning all the sensor contacts as suggested (been a bit pressed for time recently!), but I am at a loss to know how to find out if there is a fault on the sensors if the diagnostics don't show anything, adn I guess the only alternative would be to replace them anyway. Snag is that cleaning them might solve the problem - but again, how can I know given the extremely rare occurrence of the fault?

Anyway, I will keep you posted, and I will keep a lookout for other posts with a similar problem.

Cheers,

Chris

JohnDotCom · 17th May 2007, 22:53

Intermitent Faults are a Pain in the new know where in any product you are Trying to repair.
Once everything cleaned, hopefully there will be no reacurrence, as you say if it doesn't read faulty do you change it? Don't think I would until everything else checked out.
Will keep our fingers crossed for you.

apywell · 17th May 2007, 23:24

I have same year car and CDT 2.0 and have had same problem. As has already been mentioned here it was the front fuel pump. Wiggle the wires going into the top of the pump next time it wont start.

andrewmsteve · 18th May 2007, 21:17

had this problem somtime back soaking wet ecu run asearch on this site

tigerchubs · 22nd May 2007, 13:16

Had exact symptoms at christmas and always after short journeys, when left overnight car started perfect.
I removed the camshaft sensor from the head and gave it a good allover clean, had no problems since, touch wood.

Rufras · 22nd May 2007, 20:21

My one also did this last Christmas where I was visiting a supermarket and 20 minutes later it would turn over and would not start. I called RAC and they were there in 10 minutes, the RAC guy used to work with Land Rover with the TD4 (same BMW M47 engine)and showed me how to start it by leaving it in ignition position II for at least 10minutes, where it started, apparently it the pumps are starting to fail you have to do this so that they get up to pressure. I took the precaution of adding Redex soon after and the problem has never re-occurred.strange?

Keith · 23rd May 2007, 10:05

Hmm not too sure what leaving the ignition on for 10 minutes will achieve
The pumps start to run when the ignition is switched on but are then turned off by the ECU about a minute later they don't run again till the ignition is cycled again or an attempt to start the engine is made

David3807 · 23rd May 2007, 22:07

Would'nt it depend on which of pressure or time made the ECU switch the pumps off ??

If pressure maybe leaving on for 10 minutes gives the failing pump a chance to get to a workable pressure ??

17th May 2007, 23:24	#13
apywell Gets stuck in Rover 75 Saloon. 2.0 Diesel Auto. Connoisseur SE. Join Date: Nov 2006 Location: Derby Posts: 723 Thanks: 0 Thanked 0 Times in 0 Posts	I have same year car and CDT 2.0 and have had same problem. As has already been mentioned here it was the front fuel pump. Wiggle the wires going into the top of the pump next time it wont start. __________________ If there's one thing I've learned, it's that life is one crushing defeat after another until you just wish Flanders was dead. Now has an S-Type 2.7 diesel V6 twin turbo with Jag voice, bluetooth, sat nav, front and rear park assist, electric fold mirrors etc, etc, etc.....

18th May 2007, 21:17	#14
andrewmsteve Regular poster Rover 75 Tourer Join Date: Nov 2006 Location: Llangollen north wales Posts: 84 Thanks: 2 Thanked 0 Times in 0 Posts	itermitant breakdown had this problem somtime back soaking wet ecu run asearch on this site

22nd May 2007, 13:16	#15
tigerchubs Gets stuck in Rover 75 CDT+ in Yorkshire Gold Join Date: Dec 2006 Location: Sheffield Posts: 975 Thanks: 0 Thanked 0 Times in 0 Posts	Had exact symptoms at christmas and always after short journeys, when left overnight car started perfect. I removed the camshaft sensor from the head and gave it a good allover clean, had no problems since, touch wood. __________________ [SIGPIC][/SIGPIC]

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17th May 2007, 16:46	#11
Horntourer Newbie 75 Tourer 2.0 CDT Connoisseur SE 116 bhp (with RR STM1D) Join Date: Apr 2007 Location: Maidstone Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts	JDC - many thanks for your continued interest in this. Among the possible causes suggested were an intermittent fault with the cam or crank sensor, one injector with intermittent leak back, the pressure regulator solenoid on the HP pump sticking or underbonnet pump jamming. The solutions Ron suggested included using Millers Diesel Plus in the fuel and getting a can of switch/contact cleaner and spraying the engine sensor contacts - cam sensor, fuel rail sensor and if possible, the crank sensor. To date I have used the Millers Diesel Plus, and acquired a can of contact cleaner. I've used a couple of tanks of diesel with the Millers in it and it seems to me that the car goes a bit better (although since fitting the Synergy unit it has always been good). However, my problem is that there appears to be no clear cause for the problem, and it has only happened twice in a year, so I have no way of knowing what works and what does not. For example, the absence of the problem for the next six months would not confirm that the pressure regulator solenoid had been jamming and now does not because of the treatment. I will shortly be cleaning all the sensor contacts as suggested (been a bit pressed for time recently!), but I am at a loss to know how to find out if there is a fault on the sensors if the diagnostics don't show anything, adn I guess the only alternative would be to replace them anyway. Snag is that cleaning them might solve the problem - but again, how can I know given the extremely rare occurrence of the fault? Anyway, I will keep you posted, and I will keep a lookout for other posts with a similar problem. Cheers, Chris

17th May 2007, 22:53	#12
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	Intermitent Faults are a Pain in the new know where in any product you are Trying to repair. Once everything cleaned, hopefully there will be no reacurrence, as you say if it doesn't read faulty do you change it? Don't think I would until everything else checked out. Will keep our fingers crossed for you.

22nd May 2007, 20:21	#16
Rufras Avid contributor Rover 75 CDT Join Date: Nov 2006 Location: Northampton Posts: 217 Thanks: 6 Thanked 9 Times in 6 Posts	My one also did this last Christmas where I was visiting a supermarket and 20 minutes later it would turn over and would not start. I called RAC and they were there in 10 minutes, the RAC guy used to work with Land Rover with the TD4 (same BMW M47 engine)and showed me how to start it by leaving it in ignition position II for at least 10minutes, where it started, apparently it the pumps are starting to fail you have to do this so that they get up to pressure. I took the precaution of adding Redex soon after and the problem has never re-occurred.strange?

23rd May 2007, 10:05	#17
Keith This is my second home ZT400 Join Date: Oct 2006 Location: Ellesmere Posts: 5,948 Thanks: 0 Thanked 43 Times in 29 Posts	Hmm not too sure what leaving the ignition on for 10 minutes will achieve The pumps start to run when the ignition is switched on but are then turned off by the ECU about a minute later they don't run again till the ignition is cycled again or an attempt to start the engine is made

23rd May 2007, 22:07	#18
David3807 Posted a thing or two 2002 R75 Conn SE 2.5l Auto Tourer, 2001 R75 Conn SE 2.5 Auto Saloon Join Date: Nov 2006 Location: Gravesend Posts: 1,897 Thanks: 0 Thanked 2 Times in 2 Posts	Would'nt it depend on which of pressure or time made the ECU switch the pumps off ?? If pressure maybe leaving on for 10 minutes gives the failing pump a chance to get to a workable pressure ??