Real rough idle at start

[rockola1971]

Could be something to this as a possible theory... OP said "Change Oil" light came on. Was it "Change Oil" message on the DIC display or was it the oil pressure light (the oil can icon) that indicates oil pressure.

I've never seen our chassis with an Idiot Light for the oil. Only gauges. I know gm use to tie in electrically an oil pressure switch (not sensor) in series with the fuel pump relay coil (IIRC) but they havent dont that in many years. We dont even have an oil pressure switch on our engines, just sensor for the gauge.

 

[Doubeleive]

I have driven mine with both low oil level and low oil pressure and it didn't do a dam thing with the fuel pump, just gave me warnings
add bad sensor to that as well and all it did was peg the oil pressure all the way up
pretty sure this "theory is moot"

 

[MassHoe04]

I've never seen our chassis with an Idiot Light for the oil. Only gauges. I know gm use to tie in electrically an oil pressure switch (not sensor) in series with the fuel pump relay coil (IIRC) but they havent dont that in many years. We dont even have an oil pressure switch on our engines, just sensor for the gauge.

Thanks for the correction!
I am still learning about our vehicles...

Just because it exists in the owners manual, doesn't mean it is correct.
Sorry! This was in the front of my manual and I took their word that it was there on the cluster somewhere.

 

[rockola1971]

Thanks for the correction!
I am still learning about our vehicles...

Just because it exists in the owners manual, doesn't mean it is correct.
Sorry! This was in the front of my manual and I took their word that it was there on the cluster somewhere.
View attachment 367958

It could be in maybe a base model? I only have LT's and a Denali but ive been in alot of K1500 and C1500 and havent seen a idiot light in a very long time.

 

[GRAYGEORGE]

O2 sensors are usually 7/8 inch. You can also borrow/return O2 removing socket set.

 

[MassHoe04]

O2 sensors are usually 7/8 inch. You can also borrow/return O2 removing socket set.

When I have been removing a sensor that is getting replaced with new, I just cut the connector off the sensor and slip the wire through a regular box wrench to get the old one out. The old one is getting thrown out, so I make it easy and cut the connector off (the connector attached to the sensor, of course... Not the one on the harness).

Then, I'll start threading the new one by hand and use the open end wrench to tighten. So far, I have managed to get away with my basic tools and avoid having to buy or borrow any special O2 socket tool.