116 & 332

[DIYnewbie]

I've got a '94 Ranger XL, 2.3L 5 Speed, 153K mi. My CEL has come on, so I ran a KOER test and got codes 116 (Engine Coolant Temp sensor out of range) and 332 (EGR did not open/respond during test or if memory code, did not open intermittantly). Is the ECT sensor the one that's connected to my dash? The temp gauge has never worked since I bought it 4 years ago, but never had a CEL for it. As far as the EGR, not sure where to begin.
When I start it in the morning to go to work, the light comes on, and most of the time turns off once the engine is up to temp. But until then, I had to lighten up on accelerating, it struggles to gain speed, mostly up small inclines. Once it warms up most of it goes away, I just can't floor it. The idle has been a little uneven too recently. The only thing I've done recently was my last oil change, I switched from 10W30 to 5W30, that's when the CEL came on.
Any ideas where I could start? This is the first time the CEL has come on since I've owned it and have never had any major problems with it.

 

[SenorNoob]

Isn't that test supposed to be run with a warm engine?

At any rate I'd say test the sensors using a multimeter.

No, the ECT isn't the one for the dash. The ECT is a 2 wire sensor. The temperature gauge sender is a 1 wire unit.

I can't see the oil change causing problems unless it is thin enough to leak past an already severely worn seal. I think Ford recommends 5w-30 in almost everything now anyway. I know I had oiling problems using 10w-30 in an old 2.3 when it was super cold (for this area anything below 30F).

It seems unlikely, but did you knock any wiring loose when you changed the oil?

 

[adsm08]

If you didn't have the engine at temp go ahead and ignore the coolant temp code.

The EGR code is the one you want to chase. I would suspect a wiring concern, or the vacuum solenoid is dying.