View Full Version : Car starts when cold, wont start after being fully warmed up. wtf?
mikey060
05-14-2008, 11:05 PM
as the title states, my 180sx will only start when the engine is cold. it starts perfectly too. doesnt hesitate at all. however after i drive it enough to let it fully warm up and then i shut it off, it will not start up again. it will crank but will not start up. once i let it sit for 3-4 hours too fully cool down it will start up perfectly again. it is very consistant and hasnt once not failed to not start after warmup. any ideas what this could be? the car is basically stock, i have changed the air filter, fuel pump and it has aftermarket exhaust/downpipe. please help give me some idea what it could be. i will be taking the car to nissan but if there are some little things i can try i would like to atleast try them. thanks
SleeperSx
05-15-2008, 01:13 PM
is the car getting too much fuel when trying to start? Have you tried pulling the fuel pump fuse and try starting it when its hot?
Sileighty_85
05-15-2008, 01:20 PM
Coolant Temp Sensor
Mine did the same thing when I replaced my Valve cover gasket, I accidentily pulled the CTS off and would not start when warm unless WOT and cranked for 10 sec.
Reconnected it and it starts with no problems
Pull codes from the ECU to narrow it down
EDIT: If it is a CTS or another Sensor and your ECU throws a code for it dont forget to Reset the ECU
makulit054
05-15-2008, 02:42 PM
I agree with sileighty 85. There was a thread about this not too long ago.
^^ yup cts mine did the same shit
g6civcx
05-16-2008, 06:12 AM
As an alternative, check relays. This problem is common on older Hondas where the fuel pump relay doesn't work when the cabin gets hot.
mikey060
05-18-2008, 11:07 AM
Coolant Temp Sensor
Mine did the same thing when I replaced my Valve cover gasket, I accidentily pulled the CTS off and would not start when warm unless WOT and cranked for 10 sec.
Reconnected it and it starts with no problems
Pull codes from the ECU to narrow it down
EDIT: If it is a CTS or another Sensor and your ECU throws a code for it dont forget to Reset the ECU
that is the problem, i tired starting it with wot and cranked it for about 15seconds..starts fine now
i will be swapping my turbo soon and will be having it re tunned after i do so...when they re tune it will that reset it?
thanks alot for your response...saved me a lot of headache and money :bigok:
mikey060
05-18-2008, 05:53 PM
alright so i ran the ecu and got the code 13. apperently that is indeed the coolant temp sensor circuit. so what exactly do i do know...does that just tell me it IS unplugged....or it is plugged in but something is wrong with it?
Sileighty_85
05-18-2008, 05:55 PM
its either unplugged or bad
if its plugged in, then you need a new one.
Autozone 21"ish" bucks for a KA or 94 Sentra SER
the sensor is located above the thermostat housing you will see two sensors
it will the the left sensor square plug with two terminals inside
be prepared to catch coolant when you remove the sensor
after the new sensor is installed reset the ecu and you should be good
mikey060
05-19-2008, 06:46 PM
alright thanks. i found it hid in some little spot next to the engine not plugged in. i plugged it back in and its all good now. thanks a lot for the help :)
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