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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Fuel in cranckcaseViews : 1527 Replies : 28Users Viewing This Thread : |
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Feb 1st, 2020, 19:24 | #1 |
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Fuel in cranckcase
Hi, i'm Frank.
I have a 940 Estate, petrol and LPG, with a problem. There is petrol in cranckcase, why? What can be the cause ? I have a faulty MAF sensor for a week , and at power on I have stall problems up to 2000 rpm,but at LPG the maf sensor is excluded and the car is fine Is possible that a too rich mixture causes gasoline leak into the oil ? Thanks in advance Frank |
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Feb 1st, 2020, 20:41 | #2 | |
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Feb 1st, 2020, 20:58 | #3 |
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Thanks for replay, Dave.
And if injectors is ok ? Maf sensor is able to do this problem ? |
Feb 1st, 2020, 21:23 | #4 |
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The MAF sensor won't cause this, no. Almost certainly a leaky injector, possibly the cold start injector if you have one on yours.
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Feb 3rd, 2020, 01:20 | #5 |
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Petrol in the crankcase can generally be caused by a rich mixture.
I would say a faulty MAF, O2 or mgt temperature sensor could cause this, aswell as leaky injectors or FPR. Test each item before replacing. |
Feb 3rd, 2020, 05:58 | #6 | |
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All those things are going to cause a rich mixture, but not sooooo rich that is will cause the two things needed - total failure to ignite in the combustion chamber for long enough that the fuel can then get past the rings without evaporating in enough volume that you can see it in the oil. Are we SURE its petrol in the oil? Last edited by aardvarkash10; Feb 3rd, 2020 at 06:02. |
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Feb 3rd, 2020, 07:25 | #7 | |
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I'm waiting new MAF. Can I detach the flute with the injectors attached and turning the key to see if they leak? Last edited by Shardana; Feb 3rd, 2020 at 07:31. |
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Feb 3rd, 2020, 12:21 | #8 |
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I would be thinking about detaching the manifold, then running the fuel pump to create pressure. You could do this by just priming, turn the key (position 2 maybe) and not engage the starter. If you could measure fuel pressure that would be good too.
Up to 95 pump primes every time (thinner key) after 96 pump primes only after about 10s of no ignition (fatter RFID key) |
Feb 17th, 2020, 08:08 | #9 | |
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When i prime fuel circuit with the key, injectors spray fuel at high pression. It's not okay !!! Any suggestion? |
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Feb 17th, 2020, 11:05 | #10 |
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If you arn't turning the engine the injectors should not fire.
Just to be clear I meant to only the turn the ignition on, this is when the fuel pump primes, do not use the starter motor. If the injectors are leaking then they need to be replaced, but just to be sure its not an electrical issue, unplug the injectors and test again. |
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