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Author Topic: Astra oil pressure warning light coming on  (Read 14755 times)

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Shackeng

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Re: Astra oil pressure warning light coming on
« Reply #45 on: 19 January 2019, 19:55:59 »

What about a Corsa?
Vauxhall's are ok, Terry, but other makes are available. Having said that, once any car reaches a certain age, it is bound to have problems.
I guess you like Vauxhalls because you're used to working on them, but Fords are much the same, and abundant. Of course, you wouldn't have the forum to fall back on.
Decisions, decisions.
Quite so. Having scrapped three Omegas last Autumn (MOT rust failures) I sought advice on this forum, and Astras seemed attractive. Road tested one for sale locally £850, liked it, bought it. Splendid car. Bought another £330, MOT failure, on emissions test it seized up, oil starvation. Bought another £795, here we are.

Last new car I bought, 1978, was a Volkswagen Passat, nothing but trouble.  I have owned Austins, Morris's, Fords, Citroens, Peugeots, Rovers and recently Vauxhalls; not to mention a Cotton 250 Villiers twin, a BSA Road Rocket 650, and 2 Velocette Venoms 500.

What? and no Black Shadow Terry? ::)
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terry paget

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Re: Astra oil pressure warning light coming on
« Reply #46 on: 19 January 2019, 22:50:17 »

No. I believe it was quite fast for the 1960s, but then the Japanese multis came along, and they were much faster.
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Shackeng

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Re: Astra oil pressure warning light coming on
« Reply #47 on: 19 January 2019, 22:52:21 »

No. I believe it was quite fast for the 1960s, but then the Japanese multis came along, and they were much faster.

True, but the Shadow also looked the business, unlike the Black Knight which succeeded it. I still think the Rapide and Shadow were the most beautiful bikes ever built. :y
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terry paget

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Re: Astra oil pressure warning light coming on
« Reply #48 on: 20 January 2019, 10:57:36 »

No. I believe it was quite fast for the 1960s, but then the Japanese multis came along, and they were much faster.

True, but the Shadow also looked the business, unlike the Black Knight which succeeded it. I still think the Rapide and Shadow were the most beautiful bikes ever built. :y
Not sure I have ever seen one, but I parked my Velocette beside a Vincent Comet every day at Culham Laboratory and thought mine the smarter. At my bedside is the 1959 Motor Cycling booklet of Sports Model Road Tests 1959, Black Shadow page attached.

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terry paget

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Re: Astra oil pressure warning light coming on
« Reply #49 on: 20 January 2019, 11:08:26 »

Woops, too big.

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terry paget

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Re: Astra oil pressure warning light coming on
« Reply #50 on: 20 January 2019, 20:11:13 »

Back to the Astra . . .
Thanks to all for advice. This morning I ran the engine temp up to 105 degrees, and still the fan did not kick in. Summat wrong there.
I looked for other sensors in the radiator - Omegas have two - but could see none. Checked fuse 6 - OK - that leaves relays K12 and K13, check those next. I found the fan plug and socket bottom left of radiator, might check for volts there. Dead fan motor?

My Chinese code and live data reader still says oil pressure 'underpressured', but it says the same for the aircon, and this car does not have aircon, so 'underpressured' means 'don't know'. I must buy an oil pressure testing kit. The kit Nick W. suggested has a M14 x 1.5mm adapter which he says fits the thread in the block. I'll settle for that.

Thanks DG for your intriguing suggestion. I shall pursue it.

Any more thoughts?

u
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dave the builder

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Re: Astra oil pressure warning light coming on
« Reply #51 on: 20 January 2019, 20:22:46 »

I suspected the fan may not be kicking in
London traffic +hot engine+no fan =oil light  :P
was the rad hot (wet stat open ) at 105 degrees  :-\
coolant temp sensor is on the head
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Nick W

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Re: Astra oil pressure warning light coming on
« Reply #52 on: 20 January 2019, 20:28:35 »

My Chinese code and live data reader still says oil pressure 'underpressured', but it says the same for the aircon, and this car does not have aircon, so 'underpressured' means 'don't know'. I must buy an oil pressure testing kit. The kit Nick W. suggested has a M14 x 1.5mm adapter which he says fits the thread in the block. I'll settle for that.



Nick said that M14x1.5 fits an Omega block. It might fit an Astra.
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dave the builder

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Re: Astra oil pressure warning light coming on
« Reply #53 on: 20 January 2019, 20:29:56 »

Mrs Builders is a 1.6 LIFE and that has aircon  :-\
if it had aircon and it's been badly removed ,that could screw up rad fan function  :-\
does it have ac compressor on the serpentine belt ?

quick look and the oil switch is M10 x 1 mm (ebay listings spec,z16xep)
« Last Edit: 20 January 2019, 20:34:54 by dave the builder »
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terry paget

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Re: Astra oil pressure warning light coming on
« Reply #54 on: 20 January 2019, 21:08:09 »

My Chinese code and live data reader still says oil pressure 'underpressured', but it says the same for the aircon, and this car does not have aircon, so 'underpressured' means 'don't know'. I must buy an oil pressure testing kit. The kit Nick W. suggested has a M14 x 1.5mm adapter which he says fits the thread in the block. I'll settle for that.



Nick said that M14x1.5 fits an Omega block. It might fit an Astra.
Thanks for the correction. Dave below says Astra thread is 10mm x !. That's in the kit too.
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terry paget

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Re: Astra oil pressure warning light coming on
« Reply #55 on: 20 January 2019, 21:35:28 »

I suspected the fan may not be kicking in
London traffic +hot engine+no fan =oil light  :P
was the rad hot (wet stat open ) at 105 degrees  :-\
coolant temp sensor is on the head
You were dead right about the fan not engaging. Haynes says the temperature sensor on the 1.6 is in the thermostat housing. I changed the thermostat before I handed the car over to my daughter, because the heater was not working well. Just thought I should mention it. Heater worked well on the drive back from Enfield.
I did not feel the radiator when the coolant temp was 105 degrees. It was a struggle to get the coolant temp to 105, and the car did get me 143 miles home at a cracking pace with the heater good and hot, so I presume the thermostat was working all right.
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terry paget

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Re: Astra oil pressure warning light coming on
« Reply #56 on: 20 January 2019, 22:39:50 »

On my Omegas I often hear the fan whirring away when I come to rest after a hot run. I've never heard that on this Astra. I see from the wiring diagram that there are two power lines to the fan, presumably for different fan speeds. The fan is not seized, can be flicked round. My hunch is that the fan motor has failed. Any comments?
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Nick W

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Re: Astra oil pressure warning light coming on
« Reply #57 on: 20 January 2019, 23:18:34 »

On my Omegas I often hear the fan whirring away when I come to rest after a hot run. I've never heard that on this Astra. I see from the wiring diagram that there are two power lines to the fan, presumably for different fan speeds. The fan is not seized, can be flicked round. My hunch is that the fan motor has failed. Any comments?


Apply battery power to directly to the fan and see if it works. A powerprobe is the tool for this, but a couple of lengths of wire will do.
If the fan works, then check the wiring, switch and relay(if it has one).


Don't forget that the engine is small, and the radiator efficient so the fan probably isn't needed much.


The fan on my 1.8 Metro on the stock, old 1.1 radiator only cuts in when sitting in London traffic. At least it does now I've reconnected it to a thermo switch rather than the stupid manual one the previous owner bodged for peace of mind ???
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Kevin Wood

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Re: Astra oil pressure warning light coming on
« Reply #58 on: 21 January 2019, 00:26:05 »

Yep, it's not going to be nearly as reliant on the fan as a V6 Omega. If it hasn't actually overheated I would concentrate on the main issue which is oil pressure.

Does the oil pressure light come on now, and under what conditions?

High revs / Low revs / Idle revs?
Hot engine / cold engine?
After a long motorway run?
After a long period of idling?
etc.
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terry paget

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Re: Astra oil pressure warning light coming on
« Reply #59 on: 21 January 2019, 08:51:41 »

Yep, it's not going to be nearly as reliant on the fan as a V6 Omega. If it hasn't actually overheated I would concentrate on the main issue which is oil pressure.

Does the oil pressure light come on now, and under what conditions?

High revs / Low revs / Idle revs?
Hot engine / cold engine?
After a long motorway run?
After a long period of idling?
etc.
Not come on since collection in London.
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