Need help with EOT.

[Ryledup]

Alright, this is going to be a bit lengthy but I want to be as clear as I can be.

I just did my EGR delete and Oil Cooler replacement this weekend. Also loaded Vivian's Looney Tune.

After I got done with the repairs of the truck, and went to start it for the first time I noticed my EOT (scan Gauge 2) was reading at 123*F and my ECT was at 57*F, and my trans was at 56*F.

I thought it was a little odd but I went ahead and started it up. it smoked and smoked and smoked. I chocked it up to being the coolant that may have spilled into the exhaust when the EGR cooler came out.

Next morning (Monday) I went to start the truck, it did it again but this time I paid a little more attention to detail....

The Wait to start light comes on immediately like always but then almost as fast as it comes on, it extinguishes. Now I understand this light is independent of glow plugs, but subsequently I cant hear my glow plugs firing either.

I did a little troubleshooting while at work, this is what I came up with.

1. Wait to start light comes on and immediately extinguishes.

2. I jiggled the harness and messed with the connector and the EOT reading did drop from 123 to 111 to 108 and stayed. Still smoked upon start up with little to know glow plug heating.

3. unplugged EOT sensor, scan gauge read 19*F and glow plugs fired and fired until I either turned the key off, or plugged the EOT sensor back in, and then immediately shut off again.

*NOTE* I did start the truck with the EOT unplugged and man it start fast with zero fuel smoke or smell.

Now I did a lot of research in the little time I had today, and I understand if the EOT isnt reading cold enough then the glow plugs wont heat up because the truck believes the oil is warm enough for a good start.

What I am asking for is some one to go out and Ohm out there cold soaked EOT sensor and report back with a reading... I believe that the higher the resistance the colder the sensor reports. if mine happens to be shorted it could be telling my PCM that my truck is much warmer than it really is.

I will then compare mine and that should determine if its the sensor or not.

Finally, to further justify my theory, this only occurs after cold soaked start ups (6 hours plus) after it gets warmed up and stops dumping fuel trying to get it to fire off then it is good to go.



Thanks so much in advance,
Riley.



If you have any questions please ask.




PS FICM is constantly between 48 and 49 Volts. and Injectors seem to be G2G.

[Ryledup]

Connector was a little wet from either coolant leak (long long story there) or some oil. either way I dried connector using breath and isopropyl alcohol. plugged it back in and temp dropped ten degrees immediately. left her unplugged tonight for good cold soak and will check temps in the morning and report back with readings then.

[mhatlen]

The sender is shot, the glow plugs run time is dependant on oil temp anything above 120 degrees there is no glow plug cycle. You can swap the ECT and the EOT sensor they are identicle to confirm.
Once you swap them it will start like it should. You are better off with a bad ECT sensor especially in the winter. lol

[ZMANN]

but subsequently I cant hear my glow plugs firing either.

you can't really hear them maybe your hearing the injectors cycling ?

but agreed keep an eye on that sensor or replace

[Ryledup]

so I could just run to autozone and buy a ECT sensor and use it?

[mhatlen]

Sure if they don't have it trek on over to your favorite Break your Leg Loui Ford Dealership and get one there.
That is what your problem is, PCM is under impression that the engine is already warmed up. Must be clattering like hell when it starts. lol

[dannyboy950]

Our local zone's carry few 6.0 parts so you may want to go with Ford parts.
Depends on how knowledgeable your parts person is.

[Ryledup]

This things is crazy when it starts lol. its really just something that needs to be experienced rather than explained... Ill give ford a call.

[Ryledup]

alright, I r2 the sensor, just need to wait for a good cold soak. I metered the new/old New was 10 ohms and old was 3 ohms.... shorted. not by much but when talking about resistors it is enough to make all the difference between 10-20 degrees. or in my case 50 degrees. Thanks for all the help everyone! have a good day!

[mhatlen]

Well Done .....