What does the Coolant temp sensor do on a 308 QV on the recovery tank

02-20-2004, 09:55 AM

JRV I am sure you know this one. What does it do and what does it send power to? I am refering to the coolant temp sensor for the CIS system on the recovery tank. Mine is a closed circuit when cold and open when warm. So it must divert power somewhere.
Here is where I get confused. I thought it was to tell the ECU open/closed loop but the 83' QVs have one and have no 02 sensor or ECU. Kind of a puzzling question. Any insight is appreciated.

02-20-2004, 10:16 AM

Hi Rich,

the coolant temp sensor on the header tank sends a signal to the Ignition ECU that it's time to advance the timing. Those switches open at about 140F. Ferrari retards the timing and raises the idle for faster warm-ups and reduced "overall" emisions by heating the engine faster.

Regards, JRV

02-20-2004, 09:55 AM	#1 (permalink)
Richelson Posts: n/a	JRV I am sure you know this on JRV I am sure you know this one. What does it do and what does it send power to? I am refering to the coolant temp sensor for the CIS system on the recovery tank. Mine is a closed circuit when cold and open when warm. So it must divert power somewhere. Here is where I get confused. I thought it was to tell the ECU open/closed loop but the 83' QVs have one and have no 02 sensor or ECU. Kind of a puzzling question. Any insight is appreciated.

02-20-2004, 10:16 AM	#2 (permalink)
JRV Posts: n/a	Hi Rich, the coolant temp s Hi Rich, the coolant temp sensor on the header tank sends a signal to the Ignition ECU that it's time to advance the timing. Those switches open at about 140F. Ferrari retards the timing and raises the idle for faster warm-ups and reduced "overall" emisions by heating the engine faster. Regards, JRV

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)