water thermo sensor
05-11-08, 05:08 PM
#1
im just checking to see if im right.....my car will take a while to start when cold meanining a extra crank or two and when the car is warm it will have the hot start problem is it the water thermo sensor?
Water thermo sensor will cause cold start issues, and IMO the jury is out on hot starts, I had a minor hot start problem and it was fixed when I jiggled around the sensor connector a bit, completely disappeared when I replaced the sensor connector.
Soooo anyways, the sensors hardly ever fail, usually it's the connector that needs replacing. It's a typical two pin sensor / fuel injector connector.
ok my car is getting worse gas mileage than my fd something is wrong and i cant figure it out i just got my injectors cleaned and there are no leaks ill have to check again tomorrow.
Water thermo sensor will cause cold start issues, and IMO the jury is out on hot starts, I had a minor hot start problem and it was fixed when I jiggled around the sensor connector a bit, completely disappeared when I replaced the sensor connector.
Soooo anyways, the sensors hardly ever fail, usually it's the connector that needs replacing. It's a typical two pin sensor / fuel injector connector.
ok my car is getting worse gas mileage than my fd something is wrong and i cant figure it out i just got my injectors cleaned and there are no leaks ill have to check again tomorrow.
Last edited by Aaron Cake; 05-13-08 at 10:51 AM. Reason: Merge three posts
05-13-08, 10:03 AM
#2
Rotary Freak
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Bad thermosensor will cause it to take a little more crank time to start when it's cold, and it won't idle until warmed up.
I don't know about hot starts. I wouldn't think it would really matter. My thermosensor was bad in my car last week, it was hard to start when cold, but fine when warm.
The sensor just senses the temp of the water and tells the ECU how much fuel to inject.
I don't know about hot starts. I wouldn't think it would really matter. My thermosensor was bad in my car last week, it was hard to start when cold, but fine when warm.
The sensor just senses the temp of the water and tells the ECU how much fuel to inject.
05-13-08, 03:19 PM
#4
HAILERS
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An open water thermo sensor defaults to 180*F. Normal operating temperature is.............approx 180*F.
It's easy to see if the thing is good or bad. Backprobe the sensors input at the ECU, and it'll read a half volt approx when the water is fully warmed up.
When cold it's too hard to say what the voltage is at the ECU. Depends how cold the water is. Normally you'll see b/t 2-3vdc when the water is cold and as the engine warms up the voltage will drop gradually, to the half volt. REal hot days maybe 0.4vdc.
If you had a RTEK2.1 you could look at the PALM and watch the water temperature rise. That water temperature is taken right off the water thermo sensors output to the ECU.
It's easy to see if the thing is good or bad. Backprobe the sensors input at the ECU, and it'll read a half volt approx when the water is fully warmed up.
When cold it's too hard to say what the voltage is at the ECU. Depends how cold the water is. Normally you'll see b/t 2-3vdc when the water is cold and as the engine warms up the voltage will drop gradually, to the half volt. REal hot days maybe 0.4vdc.
If you had a RTEK2.1 you could look at the PALM and watch the water temperature rise. That water temperature is taken right off the water thermo sensors output to the ECU.
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