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I wished to communicate my experience with low oil pressure in my daughter's Viggen clone. It is a 2003 2.0 convertible.It has the silver valve cover designating the newer style Evap system. In the beginning of 2019, her car had `150K miles and no issues with the oil pressure light. Because of the mileage, I pulled the sump and replaced the oil pick up screen (I used an air mass screen off the 900 classic-perfect fit/larger mesh). I also cleaned up the sump and replaced all seals including those that seal the oil cooler lines. Prior to this job I had replaced the oil pump seals. I considered the job well done until she called me four months later with the report of the oil light blinking when she went around a certain curve. This was very annoying because the sump job is big and we had always used fully synthetic oil at correct intervals from 90K. I had pulled the head at 90K; it did show a little evidence of sludging-I cleaned it up, reinstalled it, and six years later everything appeared good. So...what to do? There was an additional symptom with the engine-the hydraulic cam lifters were ticking.
My first order of business was to check the cam bolt oil passages. They were somewhat fouled so I expected an improvement after cleaning. Unfortunately, although the passages were partially blocked on about 6 of the lifters the cleaning did not resolve the cam lifter noise. I pulled the sump-perfectly clean and by that I mean spotless.Because no smoking gun was found here, I pulled the oil pressure valve. The plunger had one scratch but a comparison of the old pressure valve and the new one showed the old to be about 1/8 of an inch shorter than the new. I installed the new oil pressure valve, put every thing back together with new seals, and started the car. The lifter noise was gone from start up. I then drove the piss out of the car for about a month covering 2K miles. No issues. It's all good now. My suggestion: when doing the sump/re-screening repair check both the cam bolt oil passage ways and the oil pressure valve-specifically the plunger and the spring length.
->Posting last edited on Thu, 31 Oct 2019 18:51:43.
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