Red Temp dash light
Thread Starter
|
Senior Member
Joined: Mar 1999
Posts: 3,619
Likes: 0
From: New Orleans
Red Temp dash light
i have a red temp light/check engine light. my secondary pilar temp gauge shows the temp to be perfect. the dash temp sensor is throwing a code and giving me terrible mileage. does anyone know where the temp sensor is, on my 99L?? i have a new one to install, and have looked all over for it,,,,HELP
Senior Member
Joined: Jun 2000
Posts: 648
Likes: 0
From: Milford, Ohio USA
Day-umm!
BBQ:
I figured I'd play "Good Guy" today and pop in my Ford shop manual CD and help you out. Bad decision. My head is about to explode.
User-hostile CD aside, I found two sensors that might give you a problem in theis department.
There is a "Cylinder Head Temperature (CHT)" sensor that looks like it's connected to the PCM. This is part of the "Failsafe Cooling System", and may be more likely to trip a code (or screw up your performance) than the "Engine Coolant Temperature (ECT)" sensor that, if present on a Lightning, may or may not feed the gauge in the cluster.
Note the very ambiguous wording on the previous paragraph.
The shop manual shows the CHT sensor to be screwed into the head on the driver's side bank, inboard side of the head, near the front of the vehicle. I twisted into a pretzel with the flashlight and could not see it. The shop manual instructs (for a pedestrian N/A 5.4) to remove the intake manifold to asccess it. Looks like you will need to tear down the intake to get to it, if you wish to do such.
As for the ECT sensor, the manual only indicates this part for the 4.6 liter engine, despite the sensor being referenced in all of the diagnostic charts for a failure of the temperature gauge, for all 4.6/5.4 variants. Not sure if the Lightning has one or not (the temp gauge could, I suppose, be fed off the CHT sensor). Anyway, the shop manual shows this sensor, for a 4.6 liter, to be screwed into the intake manifold on the passenger's side bank, way off to the front/passenger's side corner of the manifold. A comprehensive contorsionist session with the flashlight turned up nothing.
So there you have it. There may be one or two sensors capable of screwing you up. I can't find either. One might be under the intake manifold. Good luck.
I figured I'd play "Good Guy" today and pop in my Ford shop manual CD and help you out. Bad decision. My head is about to explode.
User-hostile CD aside, I found two sensors that might give you a problem in theis department.
There is a "Cylinder Head Temperature (CHT)" sensor that looks like it's connected to the PCM. This is part of the "Failsafe Cooling System", and may be more likely to trip a code (or screw up your performance) than the "Engine Coolant Temperature (ECT)" sensor that, if present on a Lightning, may or may not feed the gauge in the cluster.
Note the very ambiguous wording on the previous paragraph.
The shop manual shows the CHT sensor to be screwed into the head on the driver's side bank, inboard side of the head, near the front of the vehicle. I twisted into a pretzel with the flashlight and could not see it. The shop manual instructs (for a pedestrian N/A 5.4) to remove the intake manifold to asccess it. Looks like you will need to tear down the intake to get to it, if you wish to do such.
As for the ECT sensor, the manual only indicates this part for the 4.6 liter engine, despite the sensor being referenced in all of the diagnostic charts for a failure of the temperature gauge, for all 4.6/5.4 variants. Not sure if the Lightning has one or not (the temp gauge could, I suppose, be fed off the CHT sensor). Anyway, the shop manual shows this sensor, for a 4.6 liter, to be screwed into the intake manifold on the passenger's side bank, way off to the front/passenger's side corner of the manifold. A comprehensive contorsionist session with the flashlight turned up nothing.
So there you have it. There may be one or two sensors capable of screwing you up. I can't find either. One might be under the intake manifold. Good luck.
