SR will not start after it warms up - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Este510 · 04-16-2009, 03:38 AM

The car will not start when it's warm, however if I disconnect the coolant temp sensor it fires right up. I've already change the sensor twice. When the CTS is hooked up it runs fine for a while then it starts bucking and back firing, but as soon as I disconnect it runs perfect. What could it be?

Este510 · 04-19-2009, 03:08 PM

Anyone????

cotbu · 04-19-2009, 03:17 PM

Uhhh ummm the CTS! check ecu for codes. then check the wiring for coolant temp sensor then see what your coolant temperature is. Make your engine run cooler?

greenman100 · 04-19-2009, 03:26 PM

you're changing the wrong sensor

Este510 · 04-22-2009, 10:36 AM

I know where the sensor is, I changed it twice, and I have a power fc so I can't check for codes any other advise?

DC29 · 04-22-2009, 11:01 AM

hmm. possibilities.. heres what sounds like is going on, when your car is running after you first fire it up aand its cold the ecu throws more fuel in the motor until it warms up to normal operating temp. so what it sounds like is it thinks its cold the whole time even after warm up and is over-fueling.

1. too much resistance in wire to/from CTS
2. could be the sensor
3. bad ecu
4. thermostat

i would check your thermostat first

Este510 · 04-23-2009, 03:53 AM

I replaced the thermostat about 9 months ago, I will look at it again tomorrow, THANKS!

04-16-2009, 03:38 AM	#1
Este510 Zilvia Member Join Date: Aug 2006 Location: Cali Age: 44 Posts: 214 Trader Rating: (2) Feedback Score: 2 reviews	SR will not start after it warms up The car will not start when it's warm, however if I disconnect the coolant temp sensor it fires right up. I've already change the sensor twice. When the CTS is hooked up it runs fine for a while then it starts bucking and back firing, but as soon as I disconnect it runs perfect. What could it be? Last edited by Este510; 04-22-2009 at 10:33 AM..

04-19-2009, 03:17 PM	#3
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 50 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	Uhhh ummm the CTS! check ecu for codes. then check the wiring for coolant temp sensor then see what your coolant temperature is. Make your engine run cooler? __________________ LoverTechnologies "Half Broken Things!"

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04-19-2009, 03:08 PM	#2
Este510 Zilvia Member Join Date: Aug 2006 Location: Cali Age: 44 Posts: 214 Trader Rating: (2) Feedback Score: 2 reviews	Anyone????

04-19-2009, 03:26 PM	#4
greenman100 Zilvia Addict Join Date: Aug 2008 Location: Florida Posts: 694 Trader Rating: (18) Feedback Score: 18 reviews	you're changing the wrong sensor

04-22-2009, 10:36 AM	#5
Este510 Zilvia Member Join Date: Aug 2006 Location: Cali Age: 44 Posts: 214 Trader Rating: (2) Feedback Score: 2 reviews	I know where the sensor is, I changed it twice, and I have a power fc so I can't check for codes any other advise?

04-22-2009, 11:01 AM	#6
DC29 Join Date: Nov 2008 Location: HANGIN AND BANGIN IN OC Posts: 18 Trader Rating: (0) Feedback Score: 0 reviews	hmm. possibilities.. heres what sounds like is going on, when your car is running after you first fire it up aand its cold the ecu throws more fuel in the motor until it warms up to normal operating temp. so what it sounds like is it thinks its cold the whole time even after warm up and is over-fueling. 1. too much resistance in wire to/from CTS 2. could be the sensor 3. bad ecu 4. thermostat i would check your thermostat first

04-23-2009, 03:53 AM	#7
Este510 Zilvia Member Join Date: Aug 2006 Location: Cali Age: 44 Posts: 214 Trader Rating: (2) Feedback Score: 2 reviews	I replaced the thermostat about 9 months ago, I will look at it again tomorrow, THANKS!