Water temp gauge

[keithdeg56]

Gauge not working butt heater works. Would the gauge not working make my mustang run bad


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[Dino Dino Bambino]

The gauge not working won't affect the running of the engine.
What's the actual problem with the gauge? Do you have problems with any of the other gauges?
A common problem on 05-09 Mustangs is failing gauge stepper motors so that could also be yours. However it's also possible the ECT (cylinder head temperature) sensor under the intake manifold could have failed.

 

[GriffX]

AFASIK the engine has only a cylinder head temp sensor and the water and oil temp is calculated from it. If the ECU doesn't get a temp signal the engine will run on a fail safe mode and therefore can run bad. I would try to read out the
coolant temp, CHT and oil temp PIDs to look into it.

 

[JC SSP]

Wouldn’t a failed sensor set a code?

 

[GriffX]

I guess there will be a code, but I wanted to show a connection between faulty coolant temp and bad engine running.
I once had a bad coolant sensor without any code at my Mercedes, which had read 10°C too low. Engine was running during warm-up way too rich.