Engine Temperature Sensors - Ranger-Forums - The Ultimate Ford Ranger Resource


General Ford Ranger Discussion General discussion of the Ford Ranger that does not fit in any other sub-forum.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 12-04-2014
Member
Thread Starter
 
Join Date: Dec 2014
Location: Gladewater, Texas
Posts: 1
Engine Temperature Sensors

I have a 2004 Ranger with the 3.0L engine. My temperature gauge is doing strange things and I am trying to find out why. It will go up and down fairly rapidly. It never shows to get hot, but fluctuates within the operating range. I am wondering if the temperature sensors need to be replaced. Can anyone tell me specifically where they are? Also, any other ideas as to what would cause this? I have replaced the thermostat already.
Reply With Quote
  #2  
Old 12-04-2014
RF Veteran
iTrader: (1)
 
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,573
All fuel injected engine have two coolant temp "sensors", only one is really a sensor.
The two wire ECT sensor is used by the computer to adjust air/fuel mix as engine warms up, like an electronic choke.

One wire temp sender is used by the dash board gauge to relay engine temp to driver.

They are usually both located by the thermostat, so near where upper radiator hose attaches to engine.
You of course want the 1 wire SENDER.
Remove that 1 wire connector
Turn on key
temp gauge should be all the way down or all the way up, doesn't matter which but must be all the way.
Now use another wire to Ground the 1 wire, to engine or negative battery terminal.
Gauge will go all the way up or all the way down, the opposite of what it did before, but all the way.

If gauge acts correctly then wire and gauge are fine replace SENDER.
Make sure you open the box at the parts store, many parts guys don't know the difference and will give you the wrong part, the 2 wire one won't work.
Do not use "tape" on a sender, temp or oil pressure senders use the engine as a ground so need a few bare threads to get a good ground to the engine.

Clogged by-pass hoses can cause temp in engine to rise and fall randomly, wouldn't matter going uphill or down or stopped, would be random.
By-pass hoses are part of the heater system hoses.

Rising temp when stopped at a light would be a failing fan clutch.
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Broken Temperature Gauge = Broken Engine? TomJones General Technical & Electrical 7 12-19-2014 05:25 PM
4.0 Sensors VS 3.0 Sensors. ROSCO 4.0L OHV & SOHC V6 Tech 0 05-08-2012 11:15 AM
Engine temperature gauge russiankid General Technical & Electrical 6 12-06-2011 11:25 AM
Pictures of where the Engine Coolant Temperature Sensor & Sensor LOCATION? Liquidswords32 General Technical & Electrical 3 03-26-2011 02:47 PM
Engine temperature question Gallo75 General Technical & Electrical 8 12-01-2008 08:15 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -6. The time now is 10:13 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.