coolant sensor on radiator..???
#1
certified nutz and boltz
Thread Starter
Join Date: Jan 2006
Location: myrtle beach, sc
Posts: 230
Likes: 0
Received 0 Likes
on
0 Posts
coolant sensor on radiator..???
on my '87 n/a fc3s I noticed a sensor with 2 individual leads mounted on the bottom of the radiator, drivers side. what is it and what does it do? I searched the forums and checked the wiring diagram but am at a loss. the car seems to run slightly COOLER and smoother since I connected it. (could be coincidence) thanx ~rich
btw, my engine is a street-port rebuild and doesn't have a sensor on the coolant filler neck - is that a bad thing that sensor is missing? the car the motor came out of had a drastically modified wiring harness done by pros but was too brittle from heat to be used in my transplant car. mebbe the modified harness had this bypassed?
I always assumed everything was working properly but now I'm wondering if my ecu is defaulting to a fuel rich default mode cause it's missing the temp sensor... (gas mileage could be better I feel)
btw, my engine is a street-port rebuild and doesn't have a sensor on the coolant filler neck - is that a bad thing that sensor is missing? the car the motor came out of had a drastically modified wiring harness done by pros but was too brittle from heat to be used in my transplant car. mebbe the modified harness had this bypassed?
I always assumed everything was working properly but now I'm wondering if my ecu is defaulting to a fuel rich default mode cause it's missing the temp sensor... (gas mileage could be better I feel)
#2
Passing life by
Originally Posted by n/a-luvr
on my '87 n/a fc3s I noticed a sensor with 2 individual leads mounted on the bottom of the radiator, drivers side. what is it and what does it do? I searched the forums and checked the wiring diagram but am at a loss. the car seems to run slightly COOLER and smoother since I connected it. (could be coincidence) thanx ~rich
Originally Posted by n/a-luvr
btw, my engine is a street-port rebuild and doesn't have a sensor on the coolant filler neck - is that a bad thing that sensor is missing? the car the motor came out of had a drastically modified wiring harness done by pros but was too brittle from heat to be used in my transplant car. mebbe the modified harness had this bypassed?
Originally Posted by n/a-luvr
I always assumed everything was working properly but now I'm wondering if my ecu is defaulting to a fuel rich default mode cause it's missing the temp sensor... (gas mileage could be better I feel)
#3
Retired Moderator, RIP
iTrader: (142)
Join Date: Sep 2005
Location: Smiths Falls.(near Ottawa!.Mapquest IT!)
Posts: 25,581
Likes: 0
Received 131 Likes
on
114 Posts
Iceblue..thanks on that reply.. I too was wondering what that sensor was for..just replaced my rad and broke the connectors on the wires..got some connectors back on though..connectors are called FEMALE BULLET CONNECTORS..22-18 awg..they fit perfect on the sensor pins..for anyone that needs to get them..
#5
I'm a boost creep...
Join Date: Jan 2002
Location: Auckland, New Zealand
Posts: 15,608
Likes: 0
Received 8 Likes
on
8 Posts
Originally Posted by n/a-luvr
on my '87 n/a fc3s I noticed a sensor with 2 individual leads mounted on the bottom of the radiator, drivers side. what is it and what does it do?
the car seems to run slightly COOLER and smoother since I connected it.
my engine is a street-port rebuild and doesn't have a sensor on the coolant filler neck - is that a bad thing that sensor is missing?
I always assumed everything was working properly but now I'm wondering if my ecu is defaulting to a fuel rich default mode cause it's missing the temp sensor...
Originally Posted by iceblue
The only rich mode I am aware of on a S4 is if the water thermo sensor was bad. The ECU will try and richen up the car thinking its cold for emissions reasons.
#6
Passing life by
Originally Posted by NZConvertible
Nope. If the ECU's thermosensor is bad the ECU will default to a coolant temp of 80degC/176degF, which is only a few degrees below normal operating temp.The engine will run poorly when cold because the ECU would normally be adding more fuel to compenste for the cold engine. Once it's warm it will run normally, perhaps slightly on the rich side because of the temp difference. None of this has anything to do with "emissions reasons".
Trending Topics
#8
HAILERS
Join Date: May 2001
Location: FORT WORTH, TEXAS,USA
Posts: 20,563
Likes: 0
Received 21 Likes
on
19 Posts
Originally Posted by iceblue
According to GM the purpose of AWS systems was to improve emissions to heat the cars up quicker so that emissions systems are working properly and polluting less. This is the reason they dump more fuel into them and rev them higher on start up.
If you leave the connectors off the water temp switch, you'll find that your acv will be dumping air into the silencer in the right front fender instead of the exaust ports. Acutally I can see how this would effect your idle if you had a leaking anti-afterburn valve in the acv (leaking unauthorized air into the intake manifold corrupting the idle). EDIT: On second thought, you probably don't have the airpump or acv connected up so that won't apply to you.
Hmmmmm, so Mazda is a subdivision of GM???? humor
#9
Passing life by
Maybe I am just being confusing. The subject was not directly about the water thermo sensor or switch. It was implying why the ECU reads them and one of the reasons there is an AWS system, and why the ECU dumps more fuel when it thinks the car is cold.
NZ said it had nothing to do with emissions. So I stated the GM has made efforts in their schools to state that when the car reads cold id dumps fuel in to heat it up and burn off emissions bettor. One of the ways it does this is from the Water thermo sensor. A great example of this is the oil thermal pallet in the front eccentric shaft. The only purpose of this is to heat the oil up quick to reduce emissions.
I dunno maybe I am just veering off the subject and off a cliff. Anyways gave it an effort.
NZ said it had nothing to do with emissions. So I stated the GM has made efforts in their schools to state that when the car reads cold id dumps fuel in to heat it up and burn off emissions bettor. One of the ways it does this is from the Water thermo sensor. A great example of this is the oil thermal pallet in the front eccentric shaft. The only purpose of this is to heat the oil up quick to reduce emissions.
I dunno maybe I am just veering off the subject and off a cliff. Anyways gave it an effort.
#11
I'm a boost creep...
Join Date: Jan 2002
Location: Auckland, New Zealand
Posts: 15,608
Likes: 0
Received 8 Likes
on
8 Posts
Originally Posted by iceblue
According to GM the purpose of AWS systems was to improve emissions to heat the cars up quicker so that emissions systems are working properly and polluting less. This is the reason they dump more fuel into them and rev them higher on start up.
I stated the GM has made efforts in their schools to state that when the car reads cold id dumps fuel in to heat it up and burn off emissions bettor.
A great example of this is the oil thermal pallet in the front eccentric shaft. The only purpose of this is to heat the oil up quick to reduce emissions.
#12
Passing life by
Originally Posted by NZConvertible
Secondly, the AWS is there to heat up the pre-cat quicker, but they do not "dump more fuel into them" for emissions purposes. That's completely false. All engines need extra fuel when they're cold because a lot of the fuel condenses on the cold engine surfaces instead of staying in a vapour, and this obviously results in poor combustion efficiency and poor engine performance. This is why carbs have chokes and EFI systems have coolant temp compensation fuel maps.
Originally Posted by NZConvertible
It has nothing to to do with emissions, if anything it makes it worse.
Originally Posted by NZConvertible
You need to think about that statement a little harder. "Emissions" is the result of poorly or partly combusted fuel. Adding more fuel is not going to burn that off, it's going to create more emissions. I think you've just misinterpreted whatever it was that GM said.
Originally Posted by NZConvertible
Um, sort of but still wrong. The e-shaft thermal pellet doesn't heat the oil up faster, it disables the rotor cooling jets, so that the engine's internals heat up faster. There is also a thermal pellet in the oil cooler, which disables it until the oil heats up. That's probably what you were thinking of.
The thermostat pellet in the oil cooler is to sustain a proper oil temp in the motor but nothing to do with emissions.
“I know I am preaching to the wind to you nothing new, just crossing views to come to a best conclusion possible”
#13
I'm a boost creep...
Join Date: Jan 2002
Location: Auckland, New Zealand
Posts: 15,608
Likes: 0
Received 8 Likes
on
8 Posts
Originally Posted by iceblue
But by accelling the motor and adding more fuel it will heat up quicker...
Last edited by NZConvertible; 01-14-06 at 04:48 PM.
#14
Passing life by
Originally Posted by NZConvertible
Adding more fuel it will not heat the engine up quicker! .
Originally Posted by NZConvertible
Fuel does not magically burn on it's own, it has to be in the presence of oxygen from air. If you dump in excess fuel it will go straight out the tailpipe.
Originally Posted by NZConvertible
In this case it's added to compensate for condensed fuel that doesn't burn like I said.
Thread
Thread Starter
Forum
Replies
Last Post
ZaqAtaq
New Member RX-7 Technical
2
09-05-15 08:57 PM