Recently bought my first 1991 MK1 imported GTO! As anticipated I have encountered my first problem. At one stage it was a non-turbo and has had a MK2 twin turbo rebuild transplant. When viewing the car, it seemed as though everything checked out, no warning lights, minor rust, no knocking… it was purring beautifully. It wasn’t until about 40 minutes into my drive home that I noticed the oil light flickering when idling. Purchasing the car for 2.5k, I knew that there would be some problems but as it performed as it should on the test drive, I thought I was getting a steal
I soon did an oil change (10w40 super mobil semi synthetic) and replaced the filter with a high performance K&N one. The light didn’t come back for a few days but has since been intermittent when idling.
I am going to change the oil pressure switch this Saturday but failing that I know I may be looking at a new oil pump or potentially a bearing has gone.
On my oil pressure gauge at idle, it sits on the lowest notch, but goes up to about halfway when driving which I think is normal.
Any advice or potential solutions would be hugely appreciated!