Hi everyone this is my first post, a somewhat problematic one in anycase!
Ive recently got an RX-7 its a 1993 Type R with low miles, iv got a problem the standard water/coolant temp guage doesnt register any temp even when very hot.
So iv done a search about the water temp sensors and from what iv found ive gone and stripped out the airbox/pipes/etc to get to where the green plug connector is at the back of the primary water tank, is this the right sensor for displaying temperature indash?
I found that the green plug connector clip was broken meaning i didnt have to push the clip in to release it, it just pulled straight off. From looking and the sensor fitting it appears to be a 19mm nut and seems to be in a very awkward space to allow use of a spanner to remove, its impossible to get a socket onto it due the sensor body. Can anyone suggest how to go about removing this? That is if its the culprit!?
It wont be possible to start the car to test the sensor as i removed the air pump, alternator, all the air and intercooler hoses,etc. So would there be anyway of testing the existing sensor? The wiring for the sensor is short hence not much to work with if putting in hot water etc.
Any suggestions anyone?
Thanks in advance!
Hi and welcome to MRC,
You have found the right sensor, and yes they are a pig to get to !.
Ignore the black one wire sensor directly underneath the green one as this is the fan switch, also the one around the front of the water thermostat housing is the low water sensor.
Hopefully the gauge is just not working because the plug wasn\'t pushed on properly
Hope this helps
Thanks Clive!
Any tips on how to remove the sensor? Il think of a way to connect it back up and test it when its out just to see if i need a new sensor!
MAJ
you may be better fitting an aftermarket one as the stock gauge does not show "HOT" until it is normally too late and you have done some damage. they are pretty rubbish by my experience and i would never go by the readings from that alone.
cheers
Nick
I\'d back Nick with that, it is kind of an "idiot light" more than a temp gauge, by the time the needle moves higher than the point it seems to sit at constantly, you are usually too busy squinting to see the road through the plooms of steam billowing from the bonnet vents!!! Maybe a slight exaggeration, but you get the idea. 8o)
I noticed that the fan doesnt kick in and assumed that was because it didnt know how hot the water temp is, if the stock sensor is registering then the fans would work as normal? Or is that a seperate issue?
Quote from: mr_majThanks Clive!
Any tips on how to remove the sensor? Il think of a way to connect it back up and test it when its out just to see if i need a new sensor!
MAJ
19mm closed end spanner will do the trick. Removed mine yesterday to swap the thermoswitch for a cooler FC one (97deg instead of 108).
(http://i10.photobucket.com/albums/a123/frankie404/car%20parts/DSCF0062.jpg)
Cheers Frankie!
Il give that a shot tomorrow, RX-7 is off road for the time being :( just dont get time to get it sorted!
Just to update, i removed the sensor gave it a quick clean and then heated it up, when connected up the temp guage doesnt move, obviously the engine isnt started but key ignition on. I think it should display the temp setting with key in this stage??
When the sensor is disconnected altoghether the fan comes on, so im hoping this suggests that the wiring loom for the sensor is ok and that i should just replace the sensor and it will be back up and running as normal!
im in the same situation as yourself,
if your car is an import like mine you`ll haev a long wait for a part number as they have to send an email to mazda direct and get part number from them which takes 4 bloody days.
so if someone on here has the pastr number then pls share save me abit of time.
yes mikey its an import cant they match up with the existing sensor?
nope i tried to give him number on it,just got the sillent treatment over the phone.
so surely with the amount of imports over here be more sensable to give them the details on cd would it not?
dealers are getting alot worse theses days,no parts kept in stock or stuff like that.
Surely the sensor used on the RX-7 will match up to one used on other models as well! Its just a temp sensor after all, nothing special.
I will go to the dealers with the sensor i removed see what they have in stock, if they mess me around il order one from Japan.
Il let you know what happens mikey, if u have no luck as well let me know.
well i contacted my dealer about wednesday and ive still no heard back.
i was just going to buy a whole new water temp and fit it to dash but then id still have to use the exsisting sensor so either way in stuffed the now.
il let you know what the dealers tell me tommorow
update iv ordered one from mazda and they will have it on tuesday costing £20ish
must just be scottish dealers that are thick lol
any chance of getting the art number.
also anyone know what the sensor is on the right/rear underneath the engine that the wire goes to the bottom of the sump?and do i need to replace it as its broken.
mikey can you get a pic of that might help someone identify what it is!
Il give you the part number on Tuesday when i get mine.
did have one but deleted it as could post it up.
if they know what the wire on the bottom of the sump is(i think maybe level)then if they follow that to a sensor on the sid eof engine.
The green thermo sensor which Clive is referring to is for the ECU. The temp gauge is wired to a sensor in the rear plate below the oil filter and just to the left of the oil pressure sensor. Check to see if wire is still connected.
The sensor on the spark plug side of the sump is for the oil level sensor. It is not essential if you check your oil level regularly.
Kev
Quote from: FD3UKThe green thermo sensor which Clive is referring to is for the ECU. The temp gauge is wired to a sensor in the rear plate below the oil filter and just to the left of the oil pressure sensor. Check to see if wire is still connected.
The sensor on the spark plug side is for the oil level sensor. It is not essential if you check your oil level regularly.
Kev
Cheers Kev your right, forgot about that one, and from memory its a bit of a piggy to get to :Thumbs-up
wel ive gone a broke the ecu u one now so time to go break the other one lol
anyone got mazda part numbers for these as my dealers(f******) useless.
or a dealer down south that can help.
Phone RX Motors and they\'ll send out whatever you need. 01725 516 462
hi just called pip at wgt has both engine and water in stock.
but my local parts shop have the ecu one for 8.11(bonus at last)
now its a call to pip and get the gauge working.
got a new engine temp sensor and car seems to be idling abit better as well.
just waiting on temp sensor coming from pip.
so i might make it to the rolling road on thursday.
also thanks to pip for the little bit of advice he gave over the phone regarding emissions.
Kev you are right about the green thermo sensor, i replaced it and it hasnt solved the problem. What colour connector/wires are there? got any pics?
hi maj if you put your hand down besaide the oil filter you should feel a single wire going to a sensor.
im guessing its easy to get from underneath,im just waiting on mine arriving from pip tomorrow and i dont think ill be able to get to my rolling road test either.
Iv found the oil pressure sensor, there is a connector to the left of it, its a single wire connector. I cant seem to figure out where that wire goes to, its difficult to follow the wire.
Is the temp sensor for the guage underneath the oil filter plate??
QuoteThe temp gauge is wired to a sensor in the rear plate below the oil filter and just to the left of the oil pressure sensor. Check to see if wire is still connected.
Thats the one :yes
lol yeah i know now
i cant spot the sensor does any1 have a pic?
dont know if u can see it from underneath.
but if you oput your hand down the left hand side of the oil filter you should feel a single wire.
unplug that and you`ll need a 11mm socket(deep prefered and 1/4 inch drive).
i even shorted the wire out and the gauge is working .
the one pip sent me doesnt seem to work so im hoping he`s sending me another.
I dont think theres any wire there, iv checked where you said mikey! Unless its completely missing! What route does the wire take to join to the loom? Il see if i can trace it back and see if its been cut.
it goes straight into the loom wire has about 3-4 inches.
its on top of the oil pressure switch but just below the oil filter
is abit of a biatch to get to,hands like tained spider i have lol
mr maj did you get ur temp gauge working and if so whats the part number off the new sensor?
mikey no still not working, havent had time to look at it since the last post, car still off road!
ok
i did get a second hand one from wgt but still not working
checked the wire to earth and gauge goes up so not sure
i called my madza dealer again and there still bloody useless all theyu say uis we have to email mazda hq to get the part number.