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Old 04-20-2017, 03:06 AM   #1
john318isau
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Default Intermittent loss of power

On a couple of occasions over the last two weeks my car (M44 with DASC) had lost power for about 10 seconds. There doesn't seem to be any consistency as far as it happening at certain engine temperature or whether under load.

Fault code was showing some camshaft position sensor errors, so I bought a second hand genuine part but had the same issue and same error.

The problem did start after I washed the engine bay, although I'm not sure whether this is related or coincidence.

It also started after I started smelling fuel in the engine bay. I replaced some old cracked fuel hoses and found a loose hose clamp which improved this but there is still a small fuel smell. I thought when the car lost power last time that I could smell fuel strong while driving.

Is this a limp home mode? Any other possible causes for CPS error codes? Any help greatly appreciated.

Last edited by john318isau; 04-20-2017 at 04:22 AM.
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Old 04-20-2017, 05:11 AM   #2
maverick
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Are you running the rising rate fuel pressure regulator setup from Downing? Could the regulator be acting up causing a fuel pressure fluctuation and also possibly the source of the gasoline smell?


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Old 04-20-2017, 06:06 AM   #3
john318isau
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Quote:
Originally Posted by maverick View Post
Are you running the rising rate fuel pressure regulator setup from Downing? Could the regulator be acting up causing a fuel pressure fluctuation and also possibly the source of the gasoline ?
Yes,I have the RRFPR.

I don't have anything to check fuel pressure, but maybe I need to get that checked.
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Old 04-20-2017, 03:16 PM   #4
Dr Shuffles
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How long has it been since you fixed the sketchy fuel hoses? If it's been a while and you can still smell fuel, then there's another leak somewhere. If you can't find a leak in the engine bay or underneath, then maybe pull up the back seat and check the lines to the fuel pump.

A while back, I was having some mysterious engine problems - turned out it was the fuel pressure regulator. And at one point, the increased pressure caused one of the fuel hoses to pop off. A faulty FPR is definitely a possibility.

So I would find the leak, and check the fuel pressure.
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Old 04-20-2017, 10:35 PM   #5
john318isau
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Quote:
Originally Posted by Dr Shuffles View Post
How long has it been since you fixed the sketchy fuel hoses? If it's been a while and you can still smell fuel, then there's another leak somewhere. If you can't find a leak in the engine bay or underneath, then maybe pull up the back seat and check the lines to the fuel pump.

A while back, I was having some mysterious engine problems - turned out it was the fuel pressure regulator. And at one point, the increased pressure caused one of the fuel hoses to pop off. A faulty FPR is definitely a possibility.

So I would find the leak, and check the fuel pressure.
I replaced two of the rubber fuel hoses in the engine bay a week ago. There is a third one that I didn't change as it looked okay, but maybe I should change.

I have a spare fuel rail so I could try another FPR, although not the RRFPR.

I ran the car today with the camshaft sensor disconnected to see how it would drive. Aside from a slightly worse idle, it drove fine, and did not seem down on power.
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Old 04-23-2017, 12:06 AM   #6
john318isau
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Can anyone tell me what the procedure is for checking fuel pressure for a DASC equipped M44, and what the pressure should be?
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