L322 4.4 M62 running fault

noblerover · Oct 7, 2024

I have owned my 2003 l322 4.4 M62 Petrol for 5 years and done 50,000 miles in it. It is now it's 160,000 miles. In this time it just been entirely troubled free! Everything still works! But now I have a fault and it's a pig!!!

Over the last month the car started coughing/hiccupping whilst driving or whilst maneuvering a trailer at low speed. The cough is now developed into an inability to to idle at all on first startup and when you press the accelerator it the engine dies. It is now undriveable.

The engine management light is not on.
There are no fault codes
I thought it might be an air leak but the intake hose is good.
I fitted a new air mass metre but no improvement.
I am now stuck, Any ideas?

biketeacherdave · Oct 7, 2024

Smoke test it they are known for vac leaks dispite the intake hose bing ok.

Datatek · Oct 7, 2024

In tank or intermediate fuel pump could have failed causing fuel starvation.

noblerover · Oct 7, 2024

Datatek said:
In tank or intermediate fuel pump could have failed causing fuel starvation.

is there a way to test this?

noblerover · Oct 7, 2024

biketeacherdave said:
Smoke test it they are known for vac leaks dispite the intake hose bing ok.

I'm told it would have to be a massive air leek to cause the problems I am experiencing. Where else could there be a vacuum leak?

Datatek · Oct 7, 2024

noblerover said:
is there a way to test this?

I am unsure on your car, but often the pumps can be heard running when the ignition is switched on. A fuel rail pressure check is another possibility. The problem does not sound like a split pipe or manifold to me, more like a fuel starvation problem.

biketeacherdave · Oct 7, 2024

My sc engine

noblerover · Oct 10, 2024

Update on this:

Having watched a couple of videos and the excellent advice here, I began to suspect a fueling issue. I purchased a fuel pressure gauge and sure enough, the pressure was low. I bridged the relay for the fuel pump (BMW pin pattern - completely different to a normal relay) and the pump also sounded very rough indeed. So new pump ordered and will also replace the filter/regulator. This might not be the only issue but replacing these bits should move me forward!

noblerover · Oct 12, 2024

noblerover said:
Update on this:

Having watched a couple of videos and the excellent advice here, I began to suspect a fueling issue. I purchased a fuel pressure gauge and sure enough, the pressure was low. I bridged the relay for the fuel pump (BMW pin pattern - completely different to a normal relay) and the pump also sounded very rough indeed. So new pump ordered and will also replace the filter/regulator. This might not be the only issue but replacing these bits should move me forward!

New pump and filter fitted and yep she runs! Thanks for your help!

L322 4.4 M62 running fault

noblerover

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biketeacherdave

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Datatek

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noblerover

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noblerover

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Datatek

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biketeacherdave

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noblerover

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noblerover

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