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Thread: Oil Light Coming On With Low Revs/Idling Then Goes Off UNder Acceleration

  1. #1
    Member Pugheaven1's Avatar
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    Question Oil Light Coming On With Low Revs/Idling Then Goes Off UNder Acceleration

    After many miles i.e. 40+ driving into work last 2 days noticed that the oil light pops on when idling then as soon as I touch the accelerator it goes back off again. It's never from start (well apart from initiall check lights before ignition) or when driving normally and only seems to occur after a long run when idling.

    So, based on this, I checked my engine oil straight away and for leaks nothing which is good news. So then I thought there must be an oil pressure sensor and maybe as the oil is piping hot later in the drive it's thinner and the sensor is malfunctioning due to this or something weird, so ordered a new one for only £14 and can probably fit myself in case the old one is knackered. Would expect like everything, they can malfunction/wear out.

    However, while I wait for delivery in next day or two, what else could it be? Could the oil pump be on the way out and is there a way to tell or have I done the right thing and just work methodically? i.e. if the oil light doesn't come on post new sensor, assume all is well. Car is running like a dream, isn't missing a beat! Anyone else had this or any good ideas would be appreciated rather than it turns out to be serious. BTW, no errors are coming up on diagnostics and no other engine CEL lights or anything. My assumption here is, it'll be the sensor tbh?
    Cheers Pug
    2006 S-Type 2.7D Sport, Stage 1 Remap 258bhp/403lbs, K&N Filter, HGZ Green, Barley Leather Interior with Aluminium Dashboard, 15mm Spacers, Clear Indicators, Colour Coded Reflectors, Jaguar "Logo" Door Floor Lights, Green LED Footwell Lighting.

  2. #2
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    I would start with draining and checking the old oil. The 2.7's have a habit of dumping fuel into the oil and diluting it.

    TT
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  3. #3
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    hi
    as above, drain and change oil
    diesel are known for failing oil pumps
    also when the oil light is on, means you oil pressure is really low and it will destroy your engine
    cheers
    Joe
    JOE, 2004, JAGUAR, STR, ZIRCON BLUE, STAFFORDSHIRE.

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  5. #4
    Senior Member Victor's Avatar
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    Quote Originally Posted by twin--turbo View Post
    I would start with draining and checking the old oil. The 2.7's have a habit of dumping fuel into the oil and diluting it.

    TT
    ^^^^^^^^^^^^^^^^^^^^ Wot he said.

    Get it drained quick and bung some top quality oil in it. Oh, and a new filter.

    What is the oil like on the dipstick ? Has the level changed ? can you smell diesel fuel ?
    A very cynical grumpy old man
    Late 2004 2.7D auto
    Connoisseur of Fine Ales
    "Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming - What a ride, where are the wimmin?"

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    Member Pugheaven1's Avatar
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    I changed the oil 1,500 miles ago. Checked it this morning looks perfect and smells of oil. I can drop it again and double check but level is perfect, looks and smells fine.

    However makes sense to drop and change and tbh doesnt cost that much, worth doing. Then change the sensor which should be here tomorrow... if this solves it great. If it still pops up now and then then I may have to look at pump.

    Is there a way of checking the pump efficiency? I.e how can I find out if it is the pump as the last thing I wanna do is change and it's nothing wrong with it.
    Cheers Pug
    2006 S-Type 2.7D Sport, Stage 1 Remap 258bhp/403lbs, K&N Filter, HGZ Green, Barley Leather Interior with Aluminium Dashboard, 15mm Spacers, Clear Indicators, Colour Coded Reflectors, Jaguar "Logo" Door Floor Lights, Green LED Footwell Lighting.

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    Senior Member Victor's Avatar
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    If the DPF is blocked fuel will get into the sump and dilute the oil. (not good), you say the level on the dipstick is ok.........has the level gone up since you changed the oil?

    Sorry to bang on about this but an S Type diesel WITH a dpf has a reputation for dumping fuel into the sump IF the DPF is not kept clean and free.

    I regularly give thanks that my 2.7 diesel hasn't got a DPF.
    A very cynical grumpy old man
    Late 2004 2.7D auto
    Connoisseur of Fine Ales
    "Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming - What a ride, where are the wimmin?"

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    Member Pugheaven1's Avatar
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    Quote Originally Posted by Victor View Post
    If the DPF is blocked fuel will get into the sump and dilute the oil. (not good), you say the level on the dipstick is ok.........has the level gone up since you changed the oil?

    Sorry to bang on about this but an S Type diesel WITH a dpf has a reputation for dumping fuel into the sump IF the DPF is not kept clean and free.

    I regularly give thanks that my 2.7 diesel hasn't got a DPF.
    Hi Mate, thanks for reply. No, the oil level has gone down a little, it was literally on maximum when changed about 2k miles ago as I did the change. It's down a little if anything, but doesn't seem to have gone up at all. Doesn't smell on the dipstick, but I do think I'll drain again and double check, deffo worth it.

    Is there anyway of knowing if the DPF is blocked at all? There's no errors etc coming up on dash and it's running sweet as a nut which is the more annoying thing.
    Cheers Pug
    2006 S-Type 2.7D Sport, Stage 1 Remap 258bhp/403lbs, K&N Filter, HGZ Green, Barley Leather Interior with Aluminium Dashboard, 15mm Spacers, Clear Indicators, Colour Coded Reflectors, Jaguar "Logo" Door Floor Lights, Green LED Footwell Lighting.

  9. #8
    Senior Member Victor's Avatar
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    Ok, from what you have said it seems as though all is well with the oil and the DPF.

    Maybe ask your trusted Jaguar indie if he can get an oil pressure gauge plugged in to the car.
    Or maybe pop one of these in...........https://www.britishparts.co.uk/jagua...pressure-p5812
    A very cynical grumpy old man
    Late 2004 2.7D auto
    Connoisseur of Fine Ales
    "Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming - What a ride, where are the wimmin?"

  10. #9
    Member Pugheaven1's Avatar
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    Quote Originally Posted by Victor View Post
    Ok, from what you have said it seems as though all is well with the oil and the DPF.

    Maybe ask your trusted Jaguar indie if he can get an oil pressure gauge plugged in to the car.
    Or maybe pop one of these in...........https://www.britishparts.co.uk/jagua...pressure-p5812
    That's exactly what I ordered, should be here for this weekend hopefully and I'll switch over. Cheap and at least it rules one thing out at least. Yeah will ask if he can check once it's up and running see if anything untoward. Cheers for the help matey, will keep the thread updated on whatever I find though as something isn't 100% so, it's always nice to share the knowledge.
    Cheers Pug
    2006 S-Type 2.7D Sport, Stage 1 Remap 258bhp/403lbs, K&N Filter, HGZ Green, Barley Leather Interior with Aluminium Dashboard, 15mm Spacers, Clear Indicators, Colour Coded Reflectors, Jaguar "Logo" Door Floor Lights, Green LED Footwell Lighting.

  11. #10
    Senior Member barryhi's Avatar
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    Don't worry about the DPF, they perform an important job regarding soot emission - just remember to do a decent run at dual carriage way/motorway speeds to regen the DPF periodically and burn off the stored soot (the increased exhaust temperature burns it off).

    Issues tend to come with people who do the weekly shopping or town driving, although the car does have a mechanism to inject more fuel to increase the exh temp, you still need to be driving sufficient time to allow it to complete the process.

    If concerned then just keep an eye on your oil level for peace of mind.

    Just enjoy the car.
    Currently: S-Type 3.0 SE 2007
    -------------------------------------------------------------
    S-Type 3.0 Sport Auto 2004
    S-Type Spirit 2.7D Auto 2007
    S-Type 2.5 SE Auto 2004
    2 x 2.1 X-Type SE
    2 x Xj6 (1 x 4.2 litre & 1 x 3.4 Litre)
    Daimler 2.8 Litre

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