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Steve B

Joined: 27 Aug 2009
Posts: 159
Location: Cheshire

PostPosted: Sat Jul 14, 2018 7:51 am    Post subject: Any ideas....C4S not starting/oil level dropped overnight! Reply with quote

Hi guys,

Yesterday evening I was driving home from my kids swimming lesson. I was sat stationary at some traffic lights, engine was idling normally and all appeared well. Then all of a sudden the engine just stopped! No funny noises or other symptoms, it just stopped dead.

I had my fault code reader with me so I plugged in and there are no fault codes present at all. When you try to start the engine it cranks normally and the tacho need moves up so I think the crank sensor is okay but it won’t start.

I had the car recovered home last night and this morning I started to check out the fuel pump relay and fuel pump. I bridged the relay and you can hear the pump whirring at the front of the car. However it still won’t start so maybe the pump isn’t delivering the correct pressure.

I was about to continue looking at the fuel system when I noticed that this morning the oil level display is now only showing one bar above minimum! Yesterday before it broke down it was definitely up to maximum. I checked using the dipstick and this also now indicates the oil level has dropped. So the question is where has about 1 litre of oil gone overnight when the car has been sat on my driveway?! I’ve had a good look underneath and around the engine and everything appears to be dry so I don’t think it’s leaked out anywhere.

I’m most concerned about the mysterious disappearance of the engine oil. Up until I noticed this I thought it would be a new fuel pump / filter/ relay and it would be back running but I’m concerned something more serious has gone wrong. Any ideas would be gratefully received.

Many thanks,
2003 Cobalt Blue Porsche 996 C4S
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Joined: 20 Dec 2008
Posts: 1019
Location: Cheshire

1999 Porsche 996 Carrera 2

PostPosted: Sat Jul 14, 2018 8:29 am    Post subject: Reply with quote

I would think in terms of a dead Relay initially, my 993 did exactly the same except no oil loss. replace Relay with a new one and see if it works. Oil is odd certainly, try simple first.
1992 944 S2 Cabriolet, Cobalt Blue/Classic grey -gone!
1995 993 C2 Cabriolet, Midnight Blue/Marble grey -gone!
1999 996 C2 Coupe, Ocean Blue/Graphite grey
2002 E46 M3 Cabriolet, Laguna seca blue/LSB
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Joined: 20 Jan 2018
Posts: 204
Location: Beds/Bucks

PostPosted: Sat Jul 14, 2018 8:53 am    Post subject: Reply with quote

Certainly sounds an unusual one.....

Like asterix, I suspect the two things may not be related. Am not an expert, but am sure one will post shortly....

My initial thoughts:
As the oil-level dash readout is in segments, you may have only just been into the full segment, then today you may just be into a lower segment, so it may not be as much oil 'lost' as you think.....(very badly explained, it was the best I could do).
Had the car sat for a while when you checked the oil yesterday? If so, it would be at its fullest readout, whereas this morning I guess some oil may still be lining the engine (as it should be). The fact that you cant see any oil leak and you didnt see blue-smoke suggests the oil hasnt gone anywhere (hopefully!!!).
2002 996.2 C2 Cabriolet
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