Dreaded blue temp sender

[matthg40]

I'm trying to set my timing up and when the car gets up to temperature rather the the revs raising to 1200rpm mine seem to be dropping right down to 200 and literally trying it's hardest to cut out and stall.any ideas what's causing this?i can't set my timing because the marks are just jumping so I can't see where they are properly and can't get an accurate reading.

[randombadger69]

If you haven't already have a read through the diagnostic guide read it right through. Very comprehensive guide. Check the resistance of the Co Pot and make sure the sensors are all in good order.

https://www.polog40.co.uk/forum/index.php/topic,214.0.html

If it's not behaving at temperature then it could be linked to the lamda sensor.

[matthg40]

I have had a read through the diagnostic guide that was my first course of action mate.as for lamba sensor it's recently been replaced but I will check over all my sensors thanks for heads up

[642855659]

Sounds like the problem I had , check the connections on the blue temp sender, my wires were split. You can buy a blue temp repair kit off the polo performance parts section on this forum.

[matthg40]

Ah I will check that in the morning I had the same problem with the sensor next to it it and it wasn't reading properly good thinking there thanks mate

[matthg40]

I've managed to get the blue temp sender to work and now I've set the timing to the z mark whilst the blentwmpmsender is unplugged the o mark is about a tooth out when I plug it back in what's gone wrong?