pbbssi

A topic posted many times, but I have a twist. '87 Carrera, 51,000, nice puff of blue smoke on cold start, very little when warm, none observed on acceleration. Haven't done a comp/leak down, but have very good engine response and acceleration. May have ring or guide issues, but oil pressure gauge was running high and now is pegged high even at low RPM's. Oil consumption almost double what should be. Zero oil leaks. Is it possible to have an elevated oil pressure, and could it lead to what's observed?

rlwiv

What is your oil consumption?
RW

Auto_Werks 3.6

A pegged oil pressure gauge at idle is most likely an electrical problem, not an indication of engine performance. At warm idle, gently tap the oil pressure sender. Watch the gauge (or have an assistant), and I'm guessing you will see the needle swing down towards 1 bar. Elevated oil consumption is probably related to valve guide wear. Are you worse than 1Q / 1000 miles?

dshepp806

++1.

Doyle

pbbssi

I made an 830 mile run and used about a quart, not too far off from typical, but on the high side. But using for shorter runs, I am seeing close to double that. This is a new purchase, and in all other ways, it's an exceptional car. It was purchased from a reputable dealer whose been in business for 30 years, and the circumstances prevented an independent pressure/leak down test (I knew it was a chance, having already turned down a purchase after spending 300 bucks on another, and felt I'd weighed the risks adequately). I am changing the oil this weekend to ensure I have a good dino 20/50, but I also heard something about possible plugged PCV valve (??). I know may be grasping for straws, but I'll try. I do not have a Porsche mechanic in the area, so a quick leak down check is not possible. I would appreciate if anyone can tell me the preferred design for a homemade apparatus for this.
Thanks.

theiceman

how reputable is a dealer that sells you a carrera with bad valve guides ?

the deal is what makes them reputable and i am guessing this is your issue. you want to see how much blue comes out on decel or off throttle. Just have someone follow you on a quck run and they will let youknow. Think you are in for at least a top end rebuild, take it back or get your checkbook out.
sorry about your luck

sig_a

It's not likely you have to rebuild anything. I bet you have neither excess ring or valve guide wear.

Your oil pressure gauge sensor is nearly kaputt, so watch the oil pressure light.

New 911 owners often misread oil stick and gauge, and over or under fill oil tank.

Excessive oil pressure is not likely.

Low flash point oil vaporizes faster than high flash point oil, and will result in higher consumption.

Drive more and become comfortable with 911 distinct nature.