|
Register To Post |
patmc1961 | Dash Coolant Temperature always reads "LO" | ||
Guru Newb
|
I have a nagging problem. On my 1992 LT1 my dash coolant temp gauge is always reading "LO" and runs very rough in fact it won't idle. I replaced the coolant temperature sensor on the water pump twice and I get 5 volts on the connector. If I disconnect it I get the Code 15 and then the temp reads 142 and it runs a little better but still rough. Any suggestions would be greatly appreciated since I am a new memeber.
|
||
Posted on: 2011/11/13 3:27
|
|||
Transfer |
1Fast04Vert | Re: Dash Coolant Temperature always reads "LO" | ||
Elite Guru
|
What year and which sensor?
|
||
Posted on: 2011/11/13 3:34
|
|||
_________________
2004 Vert. 475hp. Built by Vengeance Racing |
|||
Transfer |
patmc1961 | Re: Dash Coolant Temperature always reads "LO" | ||
Guru Newb
|
1992 LT1 and it is the coolant temperature sensor on the water pump.
|
||
Posted on: 2011/11/13 6:52
|
|||
Transfer |
1Fast04Vert | Re: Dash Coolant Temperature always reads "LO" | ||
Elite Guru
|
It sounds like the wires have a bare spot and are shorting out.
|
||
Posted on: 2011/11/13 13:55
|
|||
_________________
2004 Vert. 475hp. Built by Vengeance Racing |
|||
Transfer |
patmc1961 | Re: Dash Coolant Temperature always reads "LO" | ||
Guru Newb
|
It must be because I looked at the schematic and there isn't much else there that it could be. Thanks
|
||
Posted on: 2011/11/13 14:40
|
|||
Transfer |
BillH | Re: Dash Coolant Temperature always reads "LO" | ||
The Stig Moderator
|
Quote:
Yea, you're going to have to check the wires all the way to the ECM. It's doughtful that you got 2 new sensors that were bad. Pull the connector and put a jumper on the yellow wire and ground the jumper - does tha analog gauge go to full hot? Does the 15 only set when you pull the connector? Or was it set before you pulled the connector? And have you cleared that code and tried it again. |
||
Posted on: 2011/11/13 14:44
|
|||
_________________
Every man dies but not every man lives. |
|||
Transfer |
tjpreul | Re: Dash Coolant Temperature always reads "LO" | ||
Elite Guru
|
There is another coolant sensor for the guages. It is located on the right head between 6&8. Are there any other codes? You might have to reset the tps. It looks like the front coolant sensor also ties into the tps.
|
||
Posted on: 2011/11/13 15:53
|
|||
_________________
Vegas wasn't built on winners. '92 auto, MSD, Banski, Taylor wires, SS lines, C5 rims, 3.07 gears, white gauges, seats from a '96. Motor: Forged rotating assy, Probe pistons, CC valvetrain, AFR heads, Procharger P1SC |
|||
Transfer |
1Fast04Vert | Re: Dash Coolant Temperature always reads "LO" | ||
Elite Guru
|
The sender on the right head only feeds to the analog gauge.
The one on the water pump feeds the readings to the ECM, which in turn also feeds the digital gauge. If the sensor shorts out the ECM thinks it is in tha artic and feeds way too much gas to the engine, which is why his won't idle. |
||
Posted on: 2011/11/13 16:09
|
|||
_________________
2004 Vert. 475hp. Built by Vengeance Racing |
|||
Transfer |
bogus | Re: Dash Coolant Temperature always reads "LO" | ||
Grand Imperial Pooh-Bah
|
And... if the temp sensor on the waterpump fails, it will freak out the engine controller, the range between the coolant and oil temps freak out, and the engine will stall out. Ask me how I know.
I would check the harness. It is possible it has been laying against the serpentine belt or something to that effect. The harness goes down the right side of the engine, up near the injectors. IIRC, it goes into the same main split loom. Check the back of the engine, there is a chance that the split loom has failed. 142 is some strange default it goes to... and I don't quite know why. Very odd. As mentioned, the sensor on the right head is a dummy and only presents a temp to the analog gauge. It has no bearing on the operation of the engine. |
||
Posted on: 2011/11/13 17:06
|
|||
_________________
The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
|||
Transfer |
Stl94LT1 | Re: Dash Coolant Temperature always reads "LO" | ||
Guru Newb
|
Isn't the coolant temp sensor (cts) and the analog gauge sensor/sending unit two seperate part numbers? If so, maybe you were given the wrong sensor?
|
||
Posted on: 2011/11/13 18:37
|
|||
_________________
|
|||
Transfer |
bogus | Re: Dash Coolant Temperature always reads "LO" | ||
Grand Imperial Pooh-Bah
|
two part numbers, two different connectors. The one on the waterpump is a 2 wire, the one on the head is 1 wire.
|
||
Posted on: 2011/11/13 22:37
|
|||
_________________
The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
|||
Transfer |
PLRX | Re: Dash Coolant Temperature always reads "LO" | ||
Senior Guru
|
I assume this is the digital gauge.
Is this only happening in the morning? How cold is it outside? The word "LO" will show on the orange LED display if the oil and coolant temperatures are below 32*F |
||
Posted on: 2011/11/19 23:56
|
|||
Transfer |
You can view topic.
You cannot start a new topic.
You cannot reply to posts.
You cannot edit your posts.
You cannot delete your posts.
You cannot add new polls.
You cannot vote in polls.
You cannot attach files to posts.
You cannot post without approval.
|