I have a 3800 n/a engine out of a 2001 Pontiac Bonneville. Last night the oil pressure started reading about 110 psi all the time. At the same time it set the check engine light. I haven't had the time to check the codes yet. But I was wondering if there is anything mechanical that could cause high oil pressure. Or am I more than likely just looking at a new sending unit.

Thanks in advance.

Thats the only thing I can think of,is a bad sending unit.
(oil pump?)

[This message has been edited by James Bond 007 (edited 01-11-2008).]

Yeah, I guess if the pressure spring broke in the oil pump it could read high.. hmmm I guess it's time to invest in a mechanical gauge to test it.

Normal pressure for the SC motor is around 80 PSI if that helps at all

There is a checkvalve in the oil filter cover that controls oil pressure. It may have gotten stuck or somthing.

Would high oil pressure set the check engine light?

no, the only thing that monitors oil pressure is a switch that is on or off at 3psi.

Yeah, the check engine light is apparently just a coincidence. It's a code 102. vacuum leak or MAP sensor. I don't see any vacuum leaks or hear any for that matter. So I might try and test the map sensor.

I'm not the one who drives that car, my wife does so I did some further monitoring yesterday. I guess the oil pressure isn't staying at 110. Yesterday when I checked, it appears to be idling at 80 and when driving it hangs between 105 - 110. Like I said I hardly ever drive that card and don't really know what normal is. She just said it's higher than usual.

what gauge are you using anyway? the fiero gauge only goes to 80, and its very inaccurate.

It has autometer guages in it. The max out at 120 psi.