Euro 4 D5 rough running smoke AFTER running a few minutes

Cossie7 · Dec 27th, 2021, 18:34

Afternoon all,

Bit of a strange one here

Cars had loads of work

First thought it was injectors so had a swap about and no change. Compression test, injector quantity etc all OK.

Car starts fine from cold but after a few minutes it's like flicking a switch and the car starts running rough and smoking quite bad

Turning the car off and re starting and it does the same thing again

Car has egr blanked and dpf is gone as though this is what the issue was as oil level was rising and smelled of diesel.

Also don't know if it's coincidence but has a decent oil leak at the rear of the engine near the timing belt which seems to run down to the lower engine mount.

From reading a couple other threads there seems to be some discussion on a blocked oil separator and maybe a vacuum leak to the egr bypass valve?

It feels like an electronic fault as like I say it runs great then it's like something turning off or on and it instantly starts running rough and smoking....

Pretty much the opposite of normal running faults which are from cold then disappear after a few minutes...

If anyone has any ideas I'd be greatful.

Many thanks

Cossie7

Sorry originally posted in the V50 section but due to it been a D5 I think it's probably better suited here.

Dec 27th, 2021, 18:34	#1
Cossie7 New Member Last Online: Mar 5th, 2022 10:25 Join Date: Dec 2021 Location: Lanark	Euro 4 D5 rough running smoke AFTER running a few minutes Afternoon all, Bit of a strange one here Cars had loads of work First thought it was injectors so had a swap about and no change. Compression test, injector quantity etc all OK. Car starts fine from cold but after a few minutes it's like flicking a switch and the car starts running rough and smoking quite bad Turning the car off and re starting and it does the same thing again Car has egr blanked and dpf is gone as though this is what the issue was as oil level was rising and smelled of diesel. Also don't know if it's coincidence but has a decent oil leak at the rear of the engine near the timing belt which seems to run down to the lower engine mount. From reading a couple other threads there seems to be some discussion on a blocked oil separator and maybe a vacuum leak to the egr bypass valve? It feels like an electronic fault as like I say it runs great then it's like something turning off or on and it instantly starts running rough and smoking.... Pretty much the opposite of normal running faults which are from cold then disappear after a few minutes... If anyone has any ideas I'd be greatful. Many thanks Cossie7 Sorry originally posted in the V50 section but due to it been a D5 I think it's probably better suited here.

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