i was driving to work yesterday morning and i had to put my foot down a bit to get into a gap when i stopped at the lights i noticed the car was idleing to fast about 1500rpm, when i got to work it was the same, so i pooped the bonnet just to have a look to see if any wires had come loose or something. At the front of the engine where the two metal water pipes are there are two sensors as i fiddled about with the one on the left the electric fan kicked in and didnt turn off with the car still idleing fast, so i turned the engine off. i started her up about 5 minutes later and the fan came straight on and the engine was still idleing fast so i popped the bonnet and had a little play with the sensor , the fan shut down and the engines idleing speed dropped to normal. What is going on here??? The engine hasnt done it since but the idle is erratic at times sometimes sitting at 900rpm drive down the road and stop and it sits at 1000rpm or 1100rpm drive a bit more and back to 900rpm and so on .

 

any thoughts much appreciated

 

jim zx

Sounds like the connector and sender unit needs the terminals cleaning, i bet there a nice shade of green, if the sender turns out to be faulty and you struggle to get one from nissan , Lucas do replacements for both senders. The fan cuts in when contact is lost to the sender , some type of safety feature IIRC. Not sure if it should effect the tickover though :confused: HTH

Yep, as above. I suspect that is also affecting idle, as it will run in the "warm up" precodure, as if the engine is still cold.

 

It will also put you in safety mode.

Yep, as above. I suspect that is also affecting idle, as it will run in the "warm up" precodure, as if the engine is still cold.

 

It will also put you in safety mode.

yep as above--water temp sensor,the biggest of the 2 on the left :)

thanks for the help guys much appreciated

 

jim zx