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Old 19th March 2017, 06:00   #1
polinsteve
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Default Engine cutting out

Hi,
I am running a 2004 CDTI which has and is running smoothly. This morning as I slowed down to come off the motorway, the engine cut out. It immediately restarted. For the final 4 miles it did the same virtually every time I slowed down. Each time it restarted with no problem. The check engine light has also come on.

Coincidental with this, last night the engine seemed to run normally just a touch after it was switched off. This morning it is doing the same, I switch off, remove the key and the engine still runs for about a second. Any ideas?
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Old 19th March 2017, 08:36   #2
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The HP fuel pressure regulator may be failing - it sits on the back of the HP fuel pump.

Worth getting the fault codes read before spending any money on parts though.
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Old 19th March 2017, 11:00   #3
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Thanks. I am hoping it's ok until I'm off on Tuesday. Unfortunately I leave in the dark and get home in the dark. I shall read the codes and bear your suggestion in mind.
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Old 19th March 2017, 11:48   #4
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Mike is spot on, this is almost certainly a HP regulator problem
I have seen this type of fault when the radial wiring supplying the 12v rail to the regulator, MAF, rail sensor, glowplug relay etc etc has an intermittent connection

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Old 19th March 2017, 14:29   #5
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Thanks Brian.
Is that the connector on the left under the manifold? Also, is that the approx location of the regulator?

Thanks
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Old 19th March 2017, 14:39   #6
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Quote:
Originally Posted by polinsteve View Post
Thanks Brian.
Is that the connector on the left under the manifold? Also, is that the approx location of the regulator?

Thanks
Hi Steve, it is hidden in the plastic trunking under the inlet manifold at the front of the engine

The supply is fed from engine compartment fusebox fuse 1 and the diagrams I've attached for you

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Old 19th March 2017, 15:49   #7
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Thanks for that, it gives me a good starting place.
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Old 19th March 2017, 20:22   #8
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Hello,
I've just used a super cheap BMW compliant reader and the fault code P1090, "Pre catalyst fuel trim system too lean bank 1" comes up. Does this make sense,is it relevant and if so does it help confirm the initial diagnosis? The code showed 30 mins after I struggled home and had disappeared when I rechecked after another 30 mins. It reappeared as soon as the engine was started. The car drove ok for the first 5 minutes or so and then started cutting out when the throttle was eased off. By slipping into neutral (auto box) before coming off the gas the engine kept running. Made for an interesting 40 minute drive home.

Last edited by polinsteve; 19th March 2017 at 20:24..
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Old 19th March 2017, 20:41   #9
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Quote:
Quote:
Originally Posted by marinabrian View Post
Hi Steve, it is hidden in the plastic trunking under the inlet manifold at the front of the engine

The supply is fed from engine compartment fusebox fuse 1 and the diagrams I've attached for you

Brian
Hi Brian/Steve.
These photo's below may help with the area of the wiring junction and the locations of the HPFP regulator etc Arctic
Attached Images
File Type: jpg SDC13013 (2).jpg (134.0 KB, 19 views)
File Type: jpg SDC13017 (2).jpg (135.4 KB, 21 views)
File Type: jpg SDC14463.jpg (135.7 KB, 21 views)
File Type: jpg SDC16789.jpg (125.1 KB, 22 views)
File Type: jpg SDC16803 (2).jpg (129.1 KB, 20 views)
File Type: jpg SDC16805.jpg (115.6 KB, 19 views)
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Old 19th March 2017, 20:58   #10
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Hi Steve
In my code breaker book it reads as below.

The voltage, frequency or value of control in the regulator circuit is incorrect (under fault ) Signal could be out of normal operating range, constant value, non-existent, corrupt, Possible fault regulator or wiring.

Eg regulator power supply short/open circuit, high circuit resistance or incorrect regulator resistance.

Note the control unit could be providing the correct signal but it is being affected by the circuit fault.

So pretty much what Brian as said already
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