MOT fail

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Norm57
Can tell where the 480 was built
Posts: 357
Joined: Wed Sep 30, 2015 5:08 pm
Location: Knaresborough

MOT fail

Post by Norm57 » Wed Jun 08, 2022 7:03 pm

Hi all,R3 failed it’s MOT today on high CO emissions.I am stuck as to how to cure it.it doesn’t have a potentiometer to adjust and I have tried a couple of bottles of injector cleaner already which has improved the mpg but not the emissions.The max limit is 3.50 and it’s reading was 4.56! Any help much appreciated.Norman

jifflemon
480 Is my middle name
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Re: MOT fail

Post by jifflemon » Wed Jun 08, 2022 8:10 pm

Where's the potentiometer gone? It was certainly fitted when it left here.

Norm57
Can tell where the 480 was built
Posts: 357
Joined: Wed Sep 30, 2015 5:08 pm
Location: Knaresborough

Re: MOT fail

Post by Norm57 » Thu Jun 09, 2022 6:37 am

jifflemon wrote:
Wed Jun 08, 2022 8:10 pm
Where's the potentiometer gone? It was certainly fitted when it left here.
Thanks Jeff, no there is nothing attached to air filter box so who knows? Will have to try and source one I guess.all other fails can be dealt with but without the potentiometer I am stuffed.

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jamescarruthers
480 Is my middle name
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Re: MOT fail

Post by jamescarruthers » Thu Jun 09, 2022 11:03 am

Sometimes they fall off the air filter and are just hanging by their wire. Either way you need to find the plug. You can replace it with your own potentiometer— originally it would go from 300 Ohms to 10k Ohms.

It’s a pity Maplins have gone. RS Components have loads for sale— be careful you don’t waste too much time looking at their stuff that has a minimum order of 1000 if you sort by price!
1987 Volvo 480 ES, 507274, 217 - Red (Ness)
2006 Citroen C6 Exclusive 3.0 petrol/LPG
2008 Mini Cooper convertible (Mau)

Previous 480's:
J123 CFU -- ES
J449 MNL -- ES auto
D864 CPV -- ES
L691 JFC -- Turbo
F70 MNR -- ES
H858 FGV -- Turbo auto
E981 KHM -- ES (509849)

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jamescarruthers
480 Is my middle name
Posts: 2361
Joined: Mon Jul 07, 2003 3:19 pm
Location: Cambridge

Re: MOT fail

Post by jamescarruthers » Thu Jun 09, 2022 8:41 pm

Renault part number for the potentiometer is Renault 7700722068 I believe. But hopefully yours is still there, swinging in the wind.
1987 Volvo 480 ES, 507274, 217 - Red (Ness)
2006 Citroen C6 Exclusive 3.0 petrol/LPG
2008 Mini Cooper convertible (Mau)

Previous 480's:
J123 CFU -- ES
J449 MNL -- ES auto
D864 CPV -- ES
L691 JFC -- Turbo
F70 MNR -- ES
H858 FGV -- Turbo auto
E981 KHM -- ES (509849)

Norm57
Can tell where the 480 was built
Posts: 357
Joined: Wed Sep 30, 2015 5:08 pm
Location: Knaresborough

Re: MOT fail

Post by Norm57 » Fri Jun 10, 2022 7:51 am

jamescarruthers wrote:
Thu Jun 09, 2022 8:41 pm
Renault part number for the potentiometer is Renault 7700722068 I believe. But hopefully yours is still there, swinging in the wind.
Thanks James will have a search when time allows although as you say I will need the plug as well.

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jamescarruthers
480 Is my middle name
Posts: 2361
Joined: Mon Jul 07, 2003 3:19 pm
Location: Cambridge

Re: MOT fail

Post by jamescarruthers » Fri Jun 10, 2022 8:08 am

Surely the plug is still in the engine bay ready to go? Or do you suspect it has been ripped off for some reason. You should find it on the bunch of wires running down the sort of middle of the engine bay, above the clutch area of the gearbox.
1987 Volvo 480 ES, 507274, 217 - Red (Ness)
2006 Citroen C6 Exclusive 3.0 petrol/LPG
2008 Mini Cooper convertible (Mau)

Previous 480's:
J123 CFU -- ES
J449 MNL -- ES auto
D864 CPV -- ES
L691 JFC -- Turbo
F70 MNR -- ES
H858 FGV -- Turbo auto
E981 KHM -- ES (509849)

Norm57
Can tell where the 480 was built
Posts: 357
Joined: Wed Sep 30, 2015 5:08 pm
Location: Knaresborough

Re: MOT fail

Post by Norm57 » Sat Jun 18, 2022 6:34 am

Update I have sourced a potentiometer from the car being broken in Norfolk. Hopefully it’s the right one.

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jamescarruthers
480 Is my middle name
Posts: 2361
Joined: Mon Jul 07, 2003 3:19 pm
Location: Cambridge

Re: MOT fail

Post by jamescarruthers » Sat Jun 18, 2022 7:58 am

Norm57 wrote:
Sat Jun 18, 2022 6:34 am
Update I have sourced a potentiometer from the car being broken in Norfolk. Hopefully it’s the right one.
Nice one. Yeah, they are all the same.
1987 Volvo 480 ES, 507274, 217 - Red (Ness)
2006 Citroen C6 Exclusive 3.0 petrol/LPG
2008 Mini Cooper convertible (Mau)

Previous 480's:
J123 CFU -- ES
J449 MNL -- ES auto
D864 CPV -- ES
L691 JFC -- Turbo
F70 MNR -- ES
H858 FGV -- Turbo auto
E981 KHM -- ES (509849)

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