We are in a deep freeze here in Canada (outhern Ontario). This has happen a couple of times.
Outside temp -25c (-12f).
Truck was plugged in all night.
After I started the truck and let it stand idle for 5min. I slowly drive away. First through town and the the hiway. When I released the go pedal the engine would drop to an idel and then would accelerate up 2 time as if I depressed the pedal. This happened 3 times this morning and the other 2 days.
I was watching the gauges while the accelerator jumped up and the oil temp would drop to 35 from 185 and back up a couple of times.
I got to work parked the truck useing my scangauge I pulled the code P0198. -(Faulty engine oil temp sensor)

Would I be ok in driving my 6.0 till it gor warmer? What should I do in the mean time? Or should I change the sensor now?

Thanks for any help.

 

Check the pigtail connector. The wire insulation was deteriorating on mine showing bare wire...same thing might be happening to you. If so, a few wraps of tape or that brush on goop in a can would get you down the road till a new pigtail can be ordered and maybe a nicer weekend.

 

Thanks. I will look at it tonight after my shift.

 

Sounds like an icp sensor goin bad. check volts to that also

 

Add Vref to the things you want to watch if you have room on your SGII.
When you loose the Vref power you no longer will have any throttle response.
So with it acting like you are revving it up there may be some screwy voltages.

Then again I could be way off the mark.

Sean

 

Not revving up, more like a litle press on the pedal and sounds like flutter when deceleration occurs. This whole sequence happens vary fast. The same code came back as well on my way home tonight. (P0198)

Just too cold to dig under the hook right now.

 

Wait till it warmer out and you have more light.
I would check that little pigtail on the oil temp sensor.
You might find that it is starting to depart this world.
Also have a look into the socket on the sensor you might
find the green fuzz of death aka : Corrosion


Sean

 

Good point on the corrosion.
I am not doing any damage while I was am I?

Thanks for all the help and advice guys.

 

I doubt it. That is unless you get it really hot in the process.
But I think you would know that.

Sean

 

Would the oil temp sensor connection cause my fan to rev as well (thats what it sounds like). You know the same sound as on a hot summer day when the engine is runn hot.

 

The way the software in the PCM is setup it just might.
I would think that you might also be seeing some higher
ECT numbers also. You might want to give that harness
a good looking at around the oil filter and where it goes
down to the ECT sensor.

Sean

 

No my coolant temps are not high. On these freezing days the ECT is just under reaching 190.
Just seeing the EOT going waky.

 

ABSOLUTELY it will cause the fan clutch to be commanded on at a higher duty cycle. The last time I had a truck with that specific DTC (P0198) set, the pigtail lock tab was broken causing exactly what you describe. Interestingly enough, you will still see an EOT temperature reading with the sensor disconnected. It will indicate an 'estimated' value is what my guess would be. It you want to test this theory out, take any vehicle that utilizes an electric fan setup, and disconnect the ECT sensor while the engine is running. Wait and see how long it takes before the cooling fan comes on at extra high speed as if an engine overheat is detected.

It's good to see you back here John. I was actually just thinking about you not too long ago. Rakel now has the hots for any low mileage 2010 to 2012 Fusion or MKZ that she can get her hands on, preferably with the 3.5L V6.

 

Thanks Mike for your input.
You said if you unplug the ECT sensor don't you mean the EOT sensor?
Now because of the deep freeze we are under now. I have an issue of working in this cold. I need my truck (daily drive), besides the fan running high am I to warry about any other issues that it may cause. If I have to I will park the truck and see about making other arranements for a ride to work untill these temps (outside) get warmer.

 

Does anyone know the part number of the EOT sensor pigtail?

I just found the part number "F65B-14A464-JB" It is for the 6.4L but I was told that they are interchangeable. Anyone confirm this?