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Ford explorer 1999 4.0 will not turn on when is only when is cold

I did replaced both temp sensor engine and coolant and did work ok for 3 days but started again

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Change the heater/glow plugs or Spark plugs

Posted on May 13, 2014

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I HAVE A 1998 FORD EXPLORE 4.0 SOHC CHECK ENGINE LIGHT CAME ON CODE PO117 COOLANT TEMP SENSOR 1 CIRCUIT LOW INPUT REPLACE IT AND IT CAME BACK ON SAME THING REPLACE IT AGAIN AND IT CAME BACK ON AGAIN WHAT...


When you replaced the part you needed to kill the old code by disconnecting the battery for 10 minutes.

The cold start problem could definitely be the result of the coolant temp switch not working. Check whether you are replacing the correct switch. The dash gauge should be a different temperature switch than the switch that runs the computer controls. It is possible that you are putting a new switch into the wrong hole.

The alternative is the wire going from the correct switch is bad to the computer plug in. Check for corroded terminals. The computer needs to know the engine is cold before it goes into the "Cold start" sequence.

Apr 06, 2010 | 1998 Ford Explorer

1 Answer

Temp gadge on 99 ford explorer does not read(move) temp even on a two hour drive... please help


You need to replace your Coolant Temp sensor. Im not to sure on the location of sensor but you will find it on engine. Hope this helped.

Mar 03, 2010 | 1999 Ford Explorer

2 Answers

I have a 1999 ford explorer ,it runs good once its worm but wont idle in the morning it has 125000 miles on it


Most probable cause:
Engine Coolant Temperature Sensor.


Hope this tip helps

R/
David

Jan 26, 2010 | 1999 Ford Explorer

1 Answer

Engine turns over, takes several trys to start


Coolant and intake air sensors adjust fuel like older cars had chokes to aid cold starts. More than likelt the coolant temp sensor

Oct 07, 2009 | 1999 Ford Mustang Cobra

1 Answer

Explorer 4.0l 4x4 temp gauge goes to cold when heater turned on


You are going to have to replace the engine thermostat.

Jan 23, 2009 | 1999 Ford Explorer

1 Answer

Rough idling when cold


I would check the coolant temp sensor. Hope this helps.

Dec 07, 2008 | 1999 Ford Explorer

2 Answers

Air problem


have you checked your filters ?? air, mass meter, any hose burnt , cracked, ??
also there is a throttle position sensor that is in charge of opening and closing the intake, if thats faulty it will cause this problem too.

May 15, 2008 | 1999 Ford Explorer

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