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Overheating of the Catalyst
Posted: Sun Jul 04, 2021 4:45 pm
by Spainal
Hello everyone!
I ask for help, I have a Bulb with the name EXT on the Dashboard.
What is this indicator?
Overheating of the catalyst?
where does he get his data from?
Re: Overheating of the Catalyst
Posted: Sun Jul 04, 2021 6:37 pm
by jamescarruthers
If you mean “EXT” as shown on the picture above of the Info Centre, you can relax, this is just the external temperature display. Green for selected to display on the Info Centre; red for the temperature being close to freezing (lower than 3 deg. C I seem to remember.
On the above image, the top two circled items denote an overheated catalytic converter. I think the lower circled item illuminates if the emissions are out of the expected range
Re: Overheating of the Catalyst
Posted: Mon Jul 05, 2021 3:45 am
by Spainal
Hey!
Revised, there is an "EXH Temp" light above the info center
The location of the lamp from left to right of the speedometer.
Right turn, burnt out bulb, little fluid in the washer barrel, EXH Temp.
What does it mean ?!
Re: Overheating of the Catalyst
Posted: Mon Jul 05, 2021 5:39 am
by jamescarruthers
Sounds like that is indeed the overheated exhaust or catalytic converter light by its position matching the symbol in the parts catalogue.
Re: Overheating of the Catalyst
Posted: Mon Jul 05, 2021 5:47 am
by Spainal
what sensor is responsible for the readings? didn't find it in the directory. Could you tell me the number of this part.
Re: Overheating of the Catalyst
Posted: Mon Jul 05, 2021 6:15 am
by jamescarruthers
Do you actually have a Catalytic Converter on a 1989 car? I thought they weren’t fitted until later, however your car could have gotten it early if it was meant for a market with tighter emissions regulations (e.g. Japan or USA).
Can you post some pics of the car up?
Re: Overheating of the Catalyst
Posted: Mon Jul 05, 2021 8:00 am
by Spainal
Probably I can, since I reached 10 messages!
There is definitely a catalyst, but it was already knocked out by the old owner.
Re: Overheating of the Catalyst
Posted: Mon Jul 05, 2021 8:02 am
by Spainal
Right now, I’ll figure out how to insert pictures on the form, as I understand them, you need to upload them to a third-party resource and only insert links here, or are they uploaded to the forum?
Re: Overheating of the Catalyst
Posted: Mon Jul 05, 2021 8:34 am
by dragonflyjewels
You need to host pictures elsewhere and post the link.
Re: Overheating of the Catalyst
Posted: Mon Jul 05, 2021 8:40 am
by Spainal
jamescarruthers wrote: ↑Mon Jul 05, 2021 6:15 am
Do you actually have a Catalytic Converter on a 1989 car? I thought they weren’t fitted until later, however your car could have gotten it early if it was meant for a market with tighter emissions regulations (e.g. Japan or USA).
Can you post some pics of the car up?
Here is the sensor that stood after the catalyst, well, it is folded, as we see the wires go to it in the zovodskie in the thermo-casing.
Here is the catalyst itself with a lambda probe
Re: Overheating of the Catalyst
Posted: Mon Jul 05, 2021 9:09 am
by jamescarruthers
Thanks. I thought 480s only had a Lambda sensor before the catalytic converter bit your car has two does it not? One after the cat also?
If your Cat is empty, it’s unlikely it is blocked and heating up so maybe you just have an indication problem? I’m sorry but I don’t know if the exhaust temperature is monitored by the Lambda sensor or a separate probe. However, looking at the parts catalogue it seems like the only sensor in the exhaust line is the Lambda sensor.
This is the Lambda sensor you should have:
https://www.rendcarparts.com/volvo/part ... RD3462685A
For B18FT engine:
- up to Chassis Number 590023: 3462685 or 3436465
- after Chassis Number 590024: 3474425
Looking at the link above, it is a 3 wire sensor probably one wire for signal (fluctuating voltage) and two wires for the built in heater. If your car has been starved of proper parts for many years, it may have a universal Lambda sensor installed, which is putting this light on the dashboard.
Can a proper car mechanic please tell us if the Exhaust Temperature light on a 480 dashboard indicates:
-1. Failed Lambda heating element
- 2. The exhaust is too hot
Re: Overheating of the Catalyst
Posted: Mon Jul 05, 2021 11:32 am
by Spainal
jamescarruthers wrote: ↑Mon Jul 05, 2021 9:09 am
Thanks. I thought 480s only had a Lambda sensor before the catalytic converter bit your car has two does it not? One after the cat also?
If your Cat is empty, it’s unlikely it is blocked and heating up so maybe you just have an indication problem? I’m sorry but I don’t know if the exhaust temperature is monitored by the Lambda sensor or a separate probe. However, looking at the parts catalogue it seems like the only sensor in the exhaust line is the Lambda sensor.
This is the Lambda sensor you should have:
https://www.rendcarparts.com/volvo/part ... RD3462685A
For B18FT engine:
- up to Chassis Number 590023: 3462685 or 3436465
- after Chassis Number 590024: 3474425
Looking at the link above, it is a 3 wire sensor probably one wire for signal (fluctuating voltage) and two wires for the built in heater. If your car has been starved of proper parts for many years, it may have a universal Lambda sensor installed, which is putting this light on the dashboard.
Can a proper car mechanic please tell us if the Exhaust Temperature light on a 480 dashboard indicates:
-1. Failed Lambda heating element
- 2. The exhaust is too hot
according to the diagrams, I should have a catalyst, behind it, as I understand it, there is some kind of temperature sensor according to the principles of a lambda probe or glow plug working on the principle of resistance, right now it is torn off and destroyed, only part of the case is screwed in, and the wires are hanging from it (2 pcs) ... if you close them, the lamp is on, and if you open them, it doesn’t light up, well, this is not exactly what I have forgotten, it was a long time ago.
Well, I'll soon assemble the engine, start it and look there, but the sensor is worth it for sure!