twinturborx7pete

iTrader: (3)

Ok, i've got a huge issue at hand it would seem.

I was driving today and the car was running fine.. running about 84C on the PFC and i had parked it, gotten my hair cut and then went back to driving. When i pulled up to the light..

All of a sudden the car started bucking, popping, and stalled. The Water temps were reading 6C-30C jumping everywhere. I eventually got the car started but it ran like crap and i had to manually idle it. After a little bit of driving, the car had no issues. The temps were around 83C and then when the fans kicked on at 85C the car had the same issues. It stalled once more in front of my neighorhood and ran like compelte crap the rest of the way home.. finally stalling out in my garage.

So now that the car is home, the hood is open. I've checked my connections and everything is fine. Everything is connected, no broken wires to what i can see and everything else seems in order.

So that i've searched, i'm hoping its something like a bad water thermosensor, but the urgency is that i have a huge rx7 meet tomorrow! So, if anyone agrees with this or thinks it is something else, please post. I'm naturally very worried that its nothing big!

twinturborx7pete

iTrader: (3)

bump!!!!

DaleClark

iTrader: (55)

Most likely it's the connection to the ECU's water temp sensor or the sensor itself. That's the only thing that could cause that problem. It's the green 2-wire connector by the alternator - check to see if it's popped off. If not, the sensor itself could be bad.

Dale

POS7

^ I second what he said.

You may also want to go into the commander and pull up the display that shows a list of all the sensors the pfc monitors -the voltage readings & switches. Its supposed to highlight any sensors that are faulty.

Herblenny

iTrader: (13)

Really?? I didn't know that.

Also, why would faulty water temp cause it to stall?? I could see bad air intake might do that but never heard of water temp.. just curious.

POS7

I can't remember exactly where it is on the pfc. I believe you go into "settings", then something else. It gives you a list of all the sensors. You should be able to adjust the tps voltages from here. It gives you off/on position of switches, etc.

This is evidence of a sensor failure. A strange reading or no reading.


Sure, just read these quotes

getting a code 9 from my new car. looked in the fsm but couldnt find it. where is it located? can I take the thermo sensor from my s4 and put it into my s5?

The water thermo sensor is a lot more critical of a part than most people realize. When mine snapped, the car had no power and was sounding and smelling like a 2-stroke boat engine. You can probably pull the connector from a junkyard if you need it.

Hey, my plug that plugs into the thermo sensor is melting and keeps falling out, causing my car to seem weaker and also, stutter.... I dont mean to jack the thread, but is someone willing to sell me just the plug??? my sensor is good, only the plug coming from the wiring harness is frigged... thankx

Yours must not have been affected as badly as mine, I could barely get my car out of the driveway. I thought the motor was fried at first.

Mines too... I didnt know how crucial it was... until I rigged it back up and went drifting... now it seems a whole lot easier to "power over" instead of "shift locking," like what I usually do... I had no ideal how crucial it is...



The ecu takes readings from this sensor. If the sensor gives the ecu f-cked up readings, the ecu will tell the car to do f-cked up things (or possibly go into some sort of limp mode).

twinturborx7pete

iTrader: (3)

OK well, here goes...

I checked the powerFC to see if it was showing any problems, and no. BTW its in ETC, Sensor/SW check. But since its a random thing, and it is plugged in, it will not read that the sensor is faulty, since it does show voltage.

Only problem is somewhere along the line the voltage is getting messed up.. IE a bad sensor.

Now my question is.. what is the part #. MazdaSpeed Motorsports lists 4 different Part #s for a SENSOR, WTR TEMP. So if anyone knows the specific part #.. i have 4 already... please let me know.. this is a 93 car.

2-Rotor

The temp sensor (green) is very crucial in reading temps and measuring for which fuel maps to use based on how hot or cold the water or coolant tempeture is. I would replace this sensor even if it still works but is just old. When this sensor gets old it as a tendency to have a slower response time. A good example would be your thermostat on your car. Lets say its old and is original, it obviously still works but it has a slower reaction rate and it cannot keep up with extreme situations well. Same kind of principal. My advice is just change it cant be any more than $70.

Just an FYI for all the people reading this if you have bad connectors on your wiring harnesses go to a junk yard and find a Mazda car that is there with in the same range of years and you will find most of the electrical connectors are the same.

POS7

Thanks, your response was far less ghetto than the terms I was using.

twinturborx7pete

iTrader: (3)

yah i've got the part #s for the temp sensor.. but thing is.. there are like 4-5 different part #s for the same part. Some are listed as DENSO, one for Automatic, and 2 others that have nothing near them. What else is weird was that i was not able to find the sensor on the parts microfiche.

anyone know for sure the part #? If not, its ok because i'll be talking to mazdacomp about it anyways, and i'll let ya'll know what they say.