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Zel's Motoring Adventures...Lada, Citroen, Sinclair, AC Model 70 - Lada MOT Work: Unobtanium ECU Located...


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#301 OFFLINE   PhilA

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Posted 21 May 2018 - 02:32 AM

Fair enough re vibration/data loss etc.

Nice little scope, got me a Tek 100MHz analog storage scope which works well, but picked up a HP logic analyzer off eBay recently that's a fantastic boon for digital work.

Phil
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#302 OFFLINE   jackytwoshoes

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Posted 21 May 2018 - 09:45 AM

Scope chat! I use a Picoscope 2204 now, such a handy tool.

#303 OFFLINE   Zelandeth

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Posted 21 May 2018 - 11:04 AM

Some of the stuff you can do with a decent logic analyser (especially if you know how to drive it) is amazing.

Likewise is how capable a lot of the modern digital storage scopes are. Mate of mine has a Rigol 1074Z (I think, may have the model number wrong) and the stuff that thing could do seemed - to someone like me who's grown up with old school scopes - like total witchcraft. Especially when you got into stuff like real-time data packet decoding and math operations. All in one little, totally portable box. Hoping that in a few years time they'll start to trickle down to the third or fourth hand market at prices I can justify.

Some of the PC based ones are actually pretty decent now too - though I'd always be wary of them being left behind by the rate that desktop PCs seem to move on at these days.

...says the guy who has machines still running Windows 3.0, 3.11 and 2000...
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Current fleet: 1996 Citroen Xantia 2.0T Activa. 1993 Lada Riva 1.5EFi Estate. 1975 AC Model 70. 1985 Sinclair C5.


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#304 OFFLINE   Zelandeth

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Posted 22 May 2018 - 07:08 PM

Unsurprisingly after 22 years, the low oil level light on my Xantia is somewhat prone to false triggering - especially on warm days.

IMG_20180522_194513.jpg

What really surprised me though is how many cars *still* don't have this facility fitted. They'll tell you if your washer fluid is low, your AdBlue, your headlight washer fluid etc...but no mention of engine oil aside from the pressure light...and when that comes on (especially in a modern car!) it's most likely already too late.

I'll stick with the handful of unscheduled oil checks when the light pings up on startup thanks...it gets checked every week or two anyway.

Suffice to say today's episode was indeed the second time this year it's happened, and she hadn't actually used a drop of oil since the last change.
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Current fleet: 1996 Citroen Xantia 2.0T Activa. 1993 Lada Riva 1.5EFi Estate. 1975 AC Model 70. 1985 Sinclair C5.


#305 OFFLINE   Tadhg Tiogar

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Posted 22 May 2018 - 07:35 PM

Unsurprisingly after 22 years, the low oil level light on my Xantia is somewhat prone to false triggering - especially on warm days.
attachicon.gifIMG_20180522_194513.jpg
What really surprised me though is how many cars *still* don't have this facility fitted. They'll tell you if your washer fluid is low, your AdBlue, your headlight washer fluid etc...but no mention of engine oil aside from the pressure light...and when that comes on (especially in a modern car!) it's most likely already too late.....


One of the little things about the CX that fascinated me was the little oil level gauge on the right of the instrument pod which springs to life for 15 seconds after turning the key before going back to sleep. I call it the electric dipstick and so far it's been pretty accurate.
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#306 OFFLINE   Zelandeth

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Posted Yesterday, 02:37 AM

One of the little things about the CX that fascinated me was the little oil level gauge on the right of the instrument pod which springs to life for 15 seconds after turning the key before going back to sleep. I call it the electric dipstick and so far it's been pretty accurate.


Renault are the only non-PSA manufacturer that I can think of off the top of my head who routinely had a level gauge in their models. Not sure how far back, but my 25 had one, as did a mate's 21 and the 19TD at work...

Wonder if they work on the same principle at the Xantia (and therefore I assume CX) ones. No floats - it uses a heater that's partly submerged in the oil and tracks how rapidly it heats up, then uses that data to work out the level. That's why this one (likewise on my previous TD) only tended to throw the odd false warning generally only in warm weather I think. It struggles with accuracy a bit when the oil temperature is already quite warm. The oil temperature seems far more affected by the ambient temperature than the coolant temperature is.
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Current fleet: 1996 Citroen Xantia 2.0T Activa. 1993 Lada Riva 1.5EFi Estate. 1975 AC Model 70. 1985 Sinclair C5.


#307 OFFLINE   PhilA

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Posted Yesterday, 04:44 AM

All my modem vehicles have a level sensor; they do not employ a gauge but will give a written warning. My truck displays "ENGINE OIL LOW. ADD OIL", along with a pressure gauge.

The ECU knows about all burned bulbs but refuses to give insight into items such as a burned headlight or brake light though.

Win some lose some.


Phil
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#308 OFFLINE   GrumpiusMaximus

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Posted Yesterday, 05:54 AM

Mine tells me about low oil before it gets critical.  It is, however, sensitive to oil so finding the right stuff just after the light has flashed up is a pain.  Last time it happened (about six months ago) I just went and bought a bottle of the closest stuff I could find and it only needed a small top-up.  I've changed it all since then anyway.

 

The number of people that don't know how to check their oil is what really alarms me.



#309 OFFLINE   Saabnut

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Posted Yesterday, 08:50 AM

My Bentley (and the Rover P4s) utilise the fuel gauge. Press a button on the dash and the fuel gauge becomes an oil level gauge. Surprisingly accurate too.


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#310 OFFLINE   Zelandeth

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Posted Yesterday, 01:08 PM

My Bentley (and the Rover P4s) utilise the fuel gauge. Press a button on the dash and the fuel gauge becomes an oil level gauge. Surprisingly accurate too.


Had forgotten that on the Rolls/Bentley having the little oil level marker on the fuel gauge. Granted it's a long time since I was last in one. Don't think I've ever been in a Rover P4...

The old Renault one used to switch to serving as an oil temperature gauge once the engine started didn't they? Usually having a separate backlit scale for the level that went out once the engine started.

Current fleet: 1996 Citroen Xantia 2.0T Activa. 1993 Lada Riva 1.5EFi Estate. 1975 AC Model 70. 1985 Sinclair C5.


#311 OFFLINE   PhilA

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Posted Yesterday, 02:26 PM

On cars like the 21 and 25 and 19 I have seen it. My GTA has the same dash but it's fitted with fuel, temp and volts gauges.

Personally I would have preferred an oil pressure gauge...


Phil
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#312 OFFLINE   Broadsword

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Posted Yesterday, 06:03 PM

One of the little things about the CX that fascinated me was the little oil level gauge on the right of the instrument pod which springs to life for 15 seconds after turning the key before going back to sleep. I call it the electric dipstick and so far it's been pretty accurate.

 

 

Unsurprisingly after 22 years, the low oil level light on my Xantia is somewhat prone to false triggering - especially on warm days.



What really surprised me though is how many cars *still* don't have this facility fitted. They'll tell you if your washer fluid is low, your AdBlue, your headlight washer fluid etc...but no mention of engine oil aside from the pressure light...and when that comes on (especially in a modern car!) it's most likely already too late.

I'll stick with the handful of unscheduled oil checks when the light pings up on startup thanks...it gets checked every week or two anyway.

Suffice to say today's episode was indeed the second time this year it's happened, and she hadn't actually used a drop of oil since the last change.

 

On my Xantia HDI the oil level light flashes for a short while after startup. I'm assuming it is a false alarm since the car is running brilliantly and oil level is spot on with no oil consumption at all.


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#313 OFFLINE   Zelandeth

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Posted Yesterday, 10:01 PM

On my Xantia HDI the oil level light flashes for a short while after startup. I'm assuming it is a false alarm since the car is running brilliantly and oil level is spot on with no oil consumption at all.


Yep, if it flashes for 30 seconds or so on startup it's reporting low oil level. Seem to recall dead sensors not being unknown...seem to recall it's a pain to get at, so probably not worth faffing with, especially if you're diligent about regular checks.

Current fleet: 1996 Citroen Xantia 2.0T Activa. 1993 Lada Riva 1.5EFi Estate. 1975 AC Model 70. 1985 Sinclair C5.





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