Possible Faulty Coolant Temp Sensor?

[gelousi]

Hey guys, i have come to a extremely annoying issue with my car. Its a s13 with a std RB20 in it nothing is modified or changed or anything like that as for yet.

The problem i get is every morning before work i start the car it hesitates to start it almost acts like a carby car were i have to pump the throttle fast to get it started then it will splatter for bout 2-5secs then runs perfect, ill have a smoke while motor is running to warm it up then i cruise nicely for about 5mins until i get to the freeway at this time the temp is on half which is normal now my problem is this the car will not rev passed 6-6500rpm it will splatter and the exhaust note changes and has a flat spot as well as power is not there. The only way i have found out to resolve this is to drive the car for about half an hour turn the motor off start it up and then the power is there perfect

Yesterday my mate suggested my Coolant Temp Sensor is faulty, the two pin yellow sensor near the temp sender for the cluster.

Has anyone else had a similar or the same issue or what can i do to get it fixed.

is there a way to temporarily bypass the sender just to make sure that is the fault?

thanks

[paulr33]

unplug it before you start the car, see what happens

the ECU should run in retard mode and run basic mapping

[3LGODZILA]

is the gauge reading accurately? it should take a good 5 - 10 mins to warm up then should sit either just under half way or bang on half way (if its pretty hot) if this is the case then its doing its job properly id be looking else where.

[gelousi]

I unplugged it on the way home from work still the same cold startup but there was a slight difference felt little like it had a flat spot at about 2500rpm on the freeway. Yeh temp guage is working to how it should be

[geraus]

Hmmm maybe knock sniffers, did you check them sensors?

[paulr33]

of course it will feel flat with the water temp sensor unplugged

the ecu will run basic retard mapping and perform sluggish but should still run

the main focus was did it change or alter the cold start issue?

[gelousi]

nope didn't make a difference.

I can put a multimeter across the sensor at cold start until warm up and see what ohms i get out of it. I know that GTRs have the same sensor and i noticed they look the same as a vl but im not sure if it will work. I guess i can just try getting one from pick a part and see how i go?

thanks

oh n Geraus its not knock sensor as my 32 4 door had an issue with the knock sensor and it was a totally different issue

[blind_elk]

ill have a smoke while motor is running to warm it up

Waste of time - and MONEY! And it will eventually destroy the engine with all the excess fuel diluting the oil.

[Adriano]

Does it have a consult port wired up, i would check trouble codes, and give up smoking

[gelousi]

hahaha yeah i have to one day...

um consult port not to sure about that, its all in a s13 i done the conversion is the port just a plug off the loom near the ecu? ive never really looked into it

[gelousi]

just found on nicoclub how to wire consult port, i will do it in the next coupple of days its on stands because im changing the clutch lol