QuestionIt is not over heating - it is related to hot weather. Maybe the air intake. This would make sense
as the air coming in is too hot. I will let you know.
thanks
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Followup To
Question -
I have a 96 Discovery V-8. It stalls when it is hot weather or when the gas gets to a low level. It
has been doing this for a while. Once it stalls it needs to cool down for a while. The temp gauge
is fine. It acts as if it is running out of gas. It seems the hotter it is in outside temperature the
worst the problem is. If I let it sit for 15 minutes it goes again. I am assuming that it has some
vapor lock problem. Let me know if you need more info. None of the mechanics that I have had it
to can seem to figure out the problem. I have changed the fuel filter as this was my first
impression of the problem.
Answer -
Hi Terry,
it could be the IAT (Intake Air Temperature Sensor) or the CTS (Coolant Temperature Sensor) that
are failing.
Another possibility is that you have a blockage in your rad or coolant line somewhere. With a 10
year old Disco, maybe its time to have your rad 'snaked' to see if any clogs are cleared. Others
would suggest that you recore your rad or replace...but if its not leaking why not just fish a rad
snake inside and see if it clears any plugs.
Seems temperature related so I'd go with the CTS first and then the IAT.
Regards,
JohnMc
NB: the only other possibility I can think of is your O2 sensors. When they start to fail you can
get all sorts of funky problems - including misfires and stalls.
Answer**************** followup ***************
Hi Terry,
Rad blockages, however small, can contribute to an undetected heat increase, thus influencing other sensors and components to react differently. The best way to tell if your rad is working 100% is to measure its temperature from the bottom and top hose entry areas. IF the difference is large - you have a blockage.
To borrow from some other owners who've had engine troubles:
The O2 sensors are electrically heated and sit on the exhaust side of your engine...very hot temps there.
The crank position sensor is a lights out sensor. No crank sensor, no spark, your calling a tow truck.
Cam position sensor, limp home mode, so you'd know when this fails.
O2 sensors, complete failure, limping home again. Slow response, horrible performance.
Coolant temp sensor-all manner of goofy things start happening.
Fuel temp sensor-usually results in hard warm condition starting, but really doesn't cause much concern when the engine is running. Usually.
The Intake Air Temperature Sensor is a dedicated sensor, mounted on the air cleaner housing. The IAT sensor is a resistive sensor, such as the change in resistance is related to change in air temperature. This signal is used to retard ignition timing if the air temperature rises above 55°C . Remember, that engine compartment temperatures.
If you can determine that you are having misfires, its possble that your VSS is beginning to go bad and giving erratic responses.
See if you can find electronic component cooling spray. You can then selectively spray electronic components and see if there is a change in performance. Do this when you are having troubles and watch to see which component improves your engines idle.
I've had TPS (throttle position sensor) problems that have caused my engine to idle widely and even stall.
Best of luck with this,
Regards,
JohnMc
