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Author Topic: What would cause high CO emissions on a 1995 2ltr  (Read 14946 times)

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Enceladus

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Re: What would cause high CO emissions on a 1995 2ltr
« Reply #75 on: 06 January 2020, 16:35:18 »
First of all don't rely on the dashboard gauge except as a sanity check. The live data should be much more accurate.
IMO your IAT and the new Circoli thermostat are still suspect.
The IAT starts at 18°C at display temp of 7°C and a live data coolant temp of 4°C.
The IAT climbs to 42°C. Even allowing for some radiated heat from the warming engine it's too high. Should be much closer to the ambient air temperature. That will affect the fueling.

Your coolant temp starts at 4°C with peaks at;
81°C before dropping back to 75°,
82°C before dropping back to 75°
90°C before dropping back to 76°
91°C before dropping back to 77°

Seems to me likely that your new Circoli thermostat is actually starting to open at around 76°C and is fully open around 90°C. Perhaps fully open even lower. The GM target is for the thermostat to remain closed until it starts to open at 92°C. 107°C should be fully open. And you've never got there.

So assuming the new coolant temperature sensor is accurate, your engine is not getting properly hot.

Where did you get the Circoli thermostat? Eurocarparts perhaps?
I know that folks are much more likely to complain when things don't work. However if you google 'Circoli thermostat', there seems to be a shed load of complaints from owners of European cars where the brand new Circoli thermostat has failed in short order and jammed open.

If it comes to replacing the thermostat again then I suggest you try a Behr, Gates or Valeo product. Or better yet an original GM (95517664) if you can find one.
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addy

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Re: What would cause high CO emissions on a 1995 2ltr
« Reply #76 on: 06 January 2020, 19:28:32 »
I don't have any complaints if something is wrong. I would sooner know and replace with a better manufacturer, saves chasing bad parts.

Is it possible to purchase the IAT and would anyone have the part code for it.
Will also look at getting a GM coolant Temp sensor would anyone have the proper code for it
will look at getting thermostat aswell.

Thanks for the Part no for the Thermostat. Hopefully can give the code (GM 95517664) to local vauxhall parts dept, and they can check for part fitting other vehicles. Also will ask for fitting of other cars with the codes for IAT and Coolant Temp.

Thanks again for all the advice.
Addy
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addy

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Re: What would cause high CO emissions on a 1995 2ltr
« Reply #77 on: 06 January 2020, 19:55:16 »
Have found a gates thermostat, incase Vauxhall don't have one. But cannot see why, seen as thermostat must fit different engines?

The thermostat I have found https://www.ebay.co.uk/itm/Coolant-Thermostat-TH14992G1-Gates-1338079-95517664-1338431-90501081-75182-New/233414064986. Does this seem the correct one?

Addy
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Nick W

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Re: What would cause high CO emissions on a 1995 2ltr
« Reply #78 on: 06 January 2020, 21:20:54 »
That's for a four cylinder Omega, and won't fit a V6.
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Raeturbo

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Re: What would cause high CO emissions on a 1995 2ltr
« Reply #79 on: 06 January 2020, 21:28:00 »
 it’s for his 2.0 16V
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addy

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Re: What would cause high CO emissions on a 1995 2ltr
« Reply #80 on: 06 January 2020, 21:40:56 »
The car with the problems, is my 1995 Vauxhall Omega 2lt 16V X20XEV engine

Got all the part numbers

IAT part number siemens 5wk96061
Thermostat GM 95517664 (Thank you Enceladus for the part number)
Engine Coolant Temperature sender siemens 5WK90601 137-95

Will contact local vauxhall dealer about the parts. Is the thermostat correct for my car, incase cann't get genuine one.

Thanks for the help.
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Doctor Gollum

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Re: What would cause high CO emissions on a 1995 2ltr
« Reply #81 on: 06 January 2020, 22:23:07 »
Make an offer on this...

https://www.ebay.co.uk/itm/Vauxhall-Thermostat-And-Seal-95517664-/273931157377

If you can, get the sensors and radiator switches from VX to avoid any issues as your car is an early one without aircon. And try to get pictures of the sensors currently on your car to confirm the plugs as there looks to be alot of variations ;)
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addy

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Re: What would cause high CO emissions on a 1995 2ltr
« Reply #82 on: 06 January 2020, 22:59:52 »
Doctor Gollum. What sort of price, would you suggest to make as a offer for the thermostat?

My car has got Aircon fitted. The car was first registered 13 October 1995. The aircon button is seperate and has a part that illuminates when on. I will ask Vauxhall for availability and price on the sensors, also in passing about the Thermostat.

Thanks
Addy
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Doctor Gollum

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Re: What would cause high CO emissions on a 1995 2ltr
« Reply #83 on: 06 January 2020, 23:10:17 »
£20 posted, if they counter, anything less than £25 on your doorstep is fair :y

Looking at the wiring diagram for your car, it only has a single radiator switch (no aircon) , so only the three sensors to obtain.  ;)
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addy

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Re: What would cause high CO emissions on a 1995 2ltr
« Reply #84 on: 06 January 2020, 23:36:27 »
Will offer them £10 for it, making £20 posted. But will goto 15 as a offer if needed.

My engine has a aircon motor. The pump can be seen in bottom right corner, of the photo of my engine.
https://drive.google.com/open?id=1l4C6cB6AgxIAeVpB4tEAXHV-5UGeoJPv

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Doctor Gollum

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Re: What would cause high CO emissions on a 1995 2ltr
« Reply #85 on: 06 January 2020, 23:40:48 »
Ah, OK, thought it didn't have it ;)

In that case you want to both fan switches as either one could trigger the fans to come on earlier than required...
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addy

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Re: What would cause high CO emissions on a 1995 2ltr
« Reply #86 on: 06 January 2020, 23:48:40 »
No worries about AC, Will ask about sensors on radiator aswell. :y
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Re: What would cause high CO emissions on a 1995 2ltr
« Reply #87 on: 07 January 2020, 00:04:41 »
It's a bit belts and braces, but all that list will cause cool running, and if they're all underperforming, then changing one may not have much of an impact...  ;)
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Enceladus

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Re: What would cause high CO emissions on a 1995 2ltr
« Reply #88 on: 07 January 2020, 04:04:24 »
Quote from: addy on 06 January 2020, 21:40:56
The car with the problems, is my 1995 Vauxhall Omega 2lt 16V X20XEV engine

Got all the part numbers

IAT part number siemens 5wk96061
Thermostat GM 95517664 (Thank you Enceladus for the part number)
Engine Coolant Temperature sender siemens 5WK90601 137-95

Will contact local vauxhall dealer about the parts. Is the thermostat correct for my car, incase cann't get genuine one.

Thanks for the help.
I believe the IAT for an Omega with X20XEV 1.0L 16V is GM 90499898 AKA Siemens 5WK90601. But I'm not certain, you need to check. Also used on Astra F and possibly the same part as Daewoo 96417820. Also I'm not saying it's definitely broken, just that the readings are implausibly high and are so far unexplained. First try removing it and cleaning the sensor element. Good quality electrical contact cleaner in an aerosol might do it.

Likewise I am not saying that the Circoli thermostat you installed is no good. However there is plenty of evidence that the engine is not heating up. I'd be considering removing it for a closer look and off car testing. I'd prefer to fit the Vauxhall one.

You've already replaced the coolant temperature sender with a Fuel Parts WS1044 version, GM #90411977. That seems to be behaving as expected. What's to say it's suspect?


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Doctor Gollum

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Re: What would cause high CO emissions on a 1995 2ltr
« Reply #89 on: 07 January 2020, 04:31:54 »
The discrepancy of 11 degrees between cold coolant and ambient air ;)
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