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Old 29-09-2017
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Default Oil Pressure Gauge going Nuts

Hi All,

I'm really sorry but me again.

I was driving to work this morning and the gauge started bouncing up and down and all over the place.

Normally when its cold it moves a little but then when the engines up to temperature its at about 2 but today it was all over.

Sometimes when I revved it would shoot up like a Rev counter, then it sit at 4 ok, brake and sit at lights and the idle would be all over the shop and then drive again and it would normalize/or continue going crazy.

Anyway, am I right in thinking that its most likely the sensor thats gone? The engine isn't overheating and (i'll check again later) I dont think im losing any MORE oil (other than the standard leaks .

Also, I hear horror stories of how hard it is to get to and replace the pressure sensor. I have a 1996 2.5td, is that located in the awkward between egr/starter motor location also?

Its absolutely hammering it down at the moment so cant get in to have a look.

Thank you! Sorry for the essay
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Old 29-09-2017
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First of all make sure the oil pump is pumping oil . While engine running open the rocker cover cap and take a look inside . If you can see oil jumping around of the rockers than pump is more likely ok and engine is safe .
Oil pressure sensor is a bummer to replace unless you remove the engine mount .
Check the wiring at the 3 pin sensor connector (mine had a broken wire once....) if all ok than sensor could be faulty .
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Last edited by amlav; 29-09-2017 at 08:47 PM.
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Old 30-09-2017
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Thanks amlay, the oil filter looks pretty old and is stuck in! Could it be a blocked/dirty filter too? Either way, Iím doing an oil change in a minute anyway to make sure and because itís due! Will try to get the filter off! Then Iíll look at the cable. Can I test the sensor with a multimeter for ohms and if so, what am I looking for reading wise? Cheers
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Old 30-09-2017
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So, Iíve changed oil and filter! Itís like it responds to the Rev counter! Iím sure before it just sat at about 2ish. Now itís goes up and down in response to engine revs. Iím thinking itís electrical because at one point wen I was pushing The gear stick to the left and it made the needle go up! Weird!!!! The engine wasnít on just on second click of ignition! I didnít have time to play with the sensor due to it getting dark when I finished the oil change. Oh and when the wngine is running and I take the oil cap off itís starts spitting at me so we have pressure.
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Old 30-09-2017
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My 98 behaved like this for a while. More every now & again going to the top of the scale & then going back to mid range. After an oil & filter change it started to behave. I put it down to crud in the sensor or a bad connection some place.
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Old 30-09-2017
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Thanks guys! Iíll keep an eye on it and see if it sorts itself out. Mines a 96 so easier to get to the sensor then the newer ones. Iíll see if I get time to this weekend to take air filter out and check the connections and give a scrub
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Old 30-09-2017
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It sounds like sensor or wiring issue . I had same problem first about 7 years ago with a broken wire at sensor connection plug/socket section . It worked fine after that till 2 years ago when the sensor itself packed up. Went the lazy way and left the old sensor in place and installed a sandwich adapter plate in between the oil filter and the filter holder . The sandwich plate has 2 threaded holes to fit different type sensors .Opted for a switch sensor with a normal open contact than adapted the wiring to suit the dash gauge . It is showing oil pressure on or off by the gauge needle .
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Old 10-10-2017
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cool, nice idea, mine just bounces around between 2 and 7. Must be a wiring connection. What else would cause pressure weirdness? I have a leaky Turbo, don't know if that would cause it. I'll have a look at the wiring when I can.
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Old 11-10-2017
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Don;t think your turbo would be the cause for oil pressure jumping up and down.
To much oil escaping trough the turbo would manifest as a runaway engine and you wouldn't be able to turn engine off unless is stalled in higher gear .
There'll be always oil residue in intercooler hoses . Quite a bit off air pressure in those hoses and it will escape a little bit than in time it builds up as oil drops .
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