[user=20801]Umpa[/user] wrote:
[quote]Right, thanks chaps, I will have a look at that. So anything under 300c means the cat is not working ?
[/quote]
300c is ballpark and can vary for a number of reasons.
As Paul suggested, with a hot engine, running at around 2500rpm, measure the temperature rise across the cat with an infra red thermometer. The outlet pipe should be higher than the inlet side if the cat is lighting up.
