Replaced my coolant temp sensor.................

[dickymint]

Just for the hell of it really. My car has always sounded rough when cold and many have said "the bigger Wedges are like that". However, the EFI fault finding PDF, says more or less, that it should be a pre-requiste to renew this sensor prior to fault finding (bit like changeing your plugs really). It has made a vast improvement to cold starting and idleing. So I guess that all my prior tweeking over the past six months need to be untweeked!!
Also what suprised me was that I was expecting loads of coolant to come out on removing the old one (i didn't drain the system and it is was full) is this normal?

[chunder]

dickymint said:

Just for the hell of it really. My car has always sounded rough when cold and many have said "the bigger Wedges are like that". However, the EFI fault finding PDF, says more or less, that it should be a pre-requiste to renew this sensor prior to fault finding (bit like changeing your plugs really). It has made a vast improvement to cold starting and idleing. So I guess that all my prior tweeking over the past six months need to be untweeked!! Also what suprised me was that I was expecting loads of coolant to come out on removing the old one (i didn't drain the system and it is was full) is this normal?

To check the sensor is operating you can unclip the terminals and check the resistance with a multimeter -should be around 425 ohms at 88*C IIRC but the EFI fault finding PDF gives exact readings for all temps anyway. Could be that it had short circuited or was reading incorrectly thereby always telling the ECU the car had warmed up but they are pretty robust devices and last for decades so I can't see that replacing as a matter of course is worth it.

Obviously if replacements worked for you then great !

[rev-erend]

Dicky - does that mean that your heater works now

[GreenV8S]

The sensor is almost at the highest point of the coolant circuit, so as long as the system is not pressurised you wouldn't expect to lose much coolant.