Oil Temp Sensor

[secondchance]

Are there two separate sensors for oil temp (analog and digital)?
Anyone know where analog sensor is located?

[WVZR-1]

Are there two separate sensors for oil temp (analog and digital)?
Anyone know where analog sensor is located?

Yun,

Where do you see Oil Temp digitally?

Temp horizontal front of Oil filter adapter, light is vertical pointed down and gauge is vertical on top! I believe!

[Jagdpanzer]

Yun,
Far as I know there is just one oil temp sensor located in the oil filter/thermostat regulator assembly below the lower oil cooler line pressure fitting. If you need one Jerry has them listed http://jerrysgaskets.com/store2/root/index.php?main_page=product_info&cPath=26&products_id=184

[secondchance]

Yun,

Where do you see Oil Temp digitally?

Temp horizontal front of Oil filter adapter, light is vertical pointed down and gauge is vertical on top! I believe!

David,

94s you can scroll trough coolat temp, voltage and oil temp numerically on trip computer screen (inst. mpg, ave. mpg and range). I don't think my 91 had digital gauge.

Reason I am asking is that oil temp digital reading is accurate but the analog gauge reads hopelessly low. So, I was wondering if there are separate senders. Based on experience when readings were off it typically was due to faulty sending unit and rarely the gauge.

[GOLDCYLON]

David,

94s you can scroll trough coolat temp, voltage and oil temp numerically on trip computer screen (inst. mpg, ave. mpg and range). I don't think my 91 had digital gauge.

Reason I am asking is that oil temp digital reading is accurate but the analog gauge reads hopelessly low. So, I was wondering if there are separate senders. Based on experience when readings were off it typically was due to faulty sending unit and rarely the gauge.

Correct the 92 model was the first year the LT5 was graced with this option when the base model went over to the LT1 motor vice the L98. MY90s and MY91s did not have this option with the addition of the "Gauges" button 92 and up

The analog oil pressure gauge its the sending unit on top of the oil filter housing. I know this as several years ago mine dropped to zero!!!!

Also using the Red Service Manual you can get all the same detail by reading the Digital C60 display on the AC next to the correct codes for the M& 90- MY91 models. GC

[secondchance]

Correct the 92 model was the first year the LT5 was graced with this option when the base model went over to the LT1 motor vice the L98. MY90s and MY91s did not have this option with the addition of the "Gauges" button 92 and up

The analog gauge its the sending unit on top of the oil filter housing. I know this as several years ago mine dropped to zero!!!!

Also using the Red Service Manual you can get all the same detail by reading the Digital C60 display on the AC next to the correct codes for the M& 90- MY91 models. GC

So there is a separate sending unit for the analog gauge?
Is this it?
http://compare.ebay.com/like/370717143456?var=lv&ltyp=AllFixedPriceItemTypes&var=sbar

[WVZR-1]

David,

94s you can scroll trough coolat temp, voltage and oil temp numerically on trip computer screen (inst. mpg, ave. mpg and range). I don't think my 91 had digital gauge.

Reason I am asking is that oil temp digital reading is accurate but the analog gauge reads hopelessly low. So, I was wondering if there are separate senders. Based on experience when readings were off it typically was due to faulty sending unit and rarely the gauge.

I recall in an FSM one time maybe seeing it mentioned that the oil temp has to be a certain value for so long before it will actually record a low level light or something of the sorts so I suspect that the single unit supplies both and you've maybe an analog gauge challenge. The LT1's etc seem to be the same. I don't ever recall seeing that on an earlier model and the CCM change came along with the LT1 so the '92+MY works for me.

*There's a descriptive note with the temp sensor that it's also used for the oil life indicator and it's a 3 pin switch so I believe it's all on the single sender. It's still available I wouldn't rush into a panic buy. It's a shame it's so difficult to get to!

It would be interesting to have others confirm the reading comparisons digitally compared to the analog display! Maybe there's no cause for concern. What are your values? Is the digital a *C or a *F?

[GOLDCYLON]

So there is a separate sending unit for the analog gauge?
Is this it?
http://compare.ebay.com/like/370717143456?var=lv&ltyp=AllFixedPriceItemTypes&var=sbar

Crap I read this wrong what I was refering too was the oil pressure switch. I am not sure on the oil temp I do believe that is the correct switch for oil temp

[secondchance]

I recall in an FSM one time maybe seeing it mentioned that the oil temp has to be a certain value for so long before it will actually record a low level light or something of the sorts so I suspect that the single unit supplies both and you've maybe an analog gauge challenge. The LT1's etc seem to be the same. I don't ever recall seeing that on an earlier model and the CCM change came along with the LT1 so the '92+MY works for me.

*There's a descriptive note with the temp sensor that it's also used for the oil life indicator and it's a 3 pin switch so I believe it's all on the single sender. It's still available I wouldn't rush into a panic buy. It's a shame it's so difficult to get to!

It would be interesting to have others confirm the reading comparisons digitally compared to the analog display! Maybe there's no cause for concern. What are your values? Is the digital a *C or a *F?

Digital display can be toggled between metric and english.

[GOLDCYLON]

Digital display can be toggled between metric and english.


Correct

[WVZR-1]

Digital display can be toggled between metric and english.

You didn't mention your variance *F since the dash is *F!

[secondchance]

You didn't mention your variance *F since the dash is *F!

Digital once fully warmed reads 170 to 175 F in cold weather (my coolant temp would be 190 to 200 F). Analog gauge the needle moves barely off resting.

[WVZR-1]

Digital once fully warmed reads 170 to 175 F in cold weather (my coolant temp would be 190 to 200 F). Analog gauge the needle moves barely off resting.

Digitally it seems fine I'd say - have others check! Where do you recall it customarily being before you noticed this discrepancy?

Oh is your coolant temp gauge 260 or 280?

GC - what is your dash gauge for water temp 260 or 280? Figured I might as well ask since you're a '91 kind a guy!!

[Jagdpanzer]

Yun,
According to the FSM the oil temp sensor has two resistor elements, one drives the anolog gauge directly and the other provides the oil temp signal to the ECM which in turn out puts the oil temp value via serial data to the CCM module which then drives instrument cluster digital display when oil temp is selected.

[WVZR-1]

Yun,
According to the FSM the oil temp sensor has two resistor elements, one drives the anolog gauge directly and the other provides the oil temp signal to the ECM which in turn out puts the oil temp value via serial data to the CCM module which then drives instrument cluster digital display when oil temp is selected.

Phil,

I had an opportunity to check a '90MY FSM and it is indeed displayed as a dual resistor output sensor with one of course to the gauge pack and the other to the ECM just like you mention. A single side of it then could of course fail, the more difficult I believe of the three at the oil filter adapter/pressure regulator to replace.

Why not maybe use a different source and separate sensor to regulate the cluster? Where? No idea!

[GOLDCYLON]

Digitally it seems fine I'd say - have others check! Where do you recall it customarily being before you noticed this discrepancy?

Oh is your coolant temp gauge 260 or 280?

GC - what is your dash gauge for water temp 260 or 280? Figured I might as well ask since you're a '91 kind a guy!!

260 for my 90s 280 for MY 91s

[GOLDCYLON]

Engine Oil Pressure/Temperature Sensors (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp.html#post1580467622)

http://i287.photobucket.com/albums/ll142/dynomite007/B%20Engine%20LT5/MOilFilterHousingLabel_zpsaa852e72.jpg

Great pic Cliff

[A26B]

Yun,
According to the FSM the oil temp sensor has two resistor elements, one drives the anolog gauge directly and the other provides the oil temp signal to the ECM which in turn out puts the oil temp value via serial data to the CCM module which then drives instrument cluster digital display when oil temp is selected.

Very good info Phil, thank you!

Re: the hardest Oil Sensor or Switch to get to is the Oil Pressure Switch.

Yun, if a new sender doesnt fix it, then maybe the stepper motor has died on the analog gauge, or maybe there is an open in the circuit.

[secondchance]

Thanks for the explanation Phil. One switch - two signals.
Also thanks for the picture so I know where to find it Cliff.
I guess I can replace the sending unit at the next ol change and see if that solves the issue. Not that I need the analog gauge but just an idea of malfunction bugs me.

Thanks all.

[dredgeguy]

Yun,
I have the same problem. Analog Oil temp gauge hardly moves at all while digital moves up like it should. If you get a new unit and they are not much $'s get 2 and I will pay next time we get together.

[secondchance]

Digitally it seems fine I'd say - have others check! Where do you recall it customarily being before you noticed this discrepancy?

Oh is your coolant temp gauge 260 or 280?

GC - what is your dash gauge for water temp 260 or 280? Figured I might as well ask since you're a '91 kind a guy!!

David,

My coolant temp gauge goes to 260 and oil temp is to 280.

[secondchance]

Yun,
I have the same problem. Analog Oil temp gauge hardly moves at all while digital moves up like it should. If you get a new unit and they are not much $'s get 2 and I will pay next time we get together.

Can do. Or would you rather wait and see if a new sending unit cures the problem first?