Rough Cold Startup

[ivanuf]

My 06 C2S with 50,000 miles developed the following problem recently.

After a night on the garage I put the key on the Acc to check

The oil level, and oil pressure goes up to 2, then I start the car

And the oil pressure drops and a oil pressure warning comes up on the screen

And the check engine light turns on. After this I turn the car off and I put the key

On the acc again, then I get the same oil presure, but this time when I turn the car on

The pressure goes up to 5psi and stays there until the car warms up. After that the car

Will start ok until it cools off again. I have a durometric scanner and it shows no faults in memory.

After this cold startup ritual the car works fine and shows no problem sign.

Tomorrow I will clean the MAF and change the oil(is not due, But worth the try). Any additional ideas or recomendations

[kbrandsma]

Could it be a faulty oil level sensor?

[RFM]

At the same time i would replace the oil Pressure sensor, they are often a source of annoyance. You can find, and clear, the codes on oil pressure, brake fluid level, etc. in the menu "Combi Instrument" (instrument cluster) if available on Durametric, if not use a PIWIS.

[ivanuf]

Any diagram to the location of the Oil Pressure sensor?

[Loren]

Any diagram to the location of the Oil Pressure sensor?

Same as on the 996 engine.

[ivanuf]

Ok guys I changed the oil with Mobil1 0w40 and the car is working fine now. On the last

Oil change my shop was out of 0w40 and they put 20w50 and it worked fine for 6 months

But after that the oil pump was starting to have problems pumping it in the mornings. Note

That one of the reasons I was not concern at the time was that I live in PR and the temperature

Never goes below 75 degress (F) during the winter and in the summer it gets in the 100 degrees

(F). But I guess that at 50,000 miles on these engines they still have like new internal tolerances.