pcar

Finally a question I cant find with the help of the seach function! I was wondering if there is a proper engine shut-down procedure for the injected Air-cooled porsche engines. Aircraft (both Lycoming @ Continental) recommend a short run up before shut down. I have been told that this helps "clear" some of the gases from the conbustion chambers as well as help spead oil around cylinder walls. It seems that when I shut down my motor using this procedure I do notice a small amount of smoke at start-up ...(note my car has had a first rate top-end job and does not burn oil in any noticable manner) It seems to me that oil introduced in this manner might be of some use when the engine is cold started. In short what is the best way to help keep my CEL light off short of 1hr drives at high R.P.M. (I would love to live my life that way...however sometimes the drive is just to short)

sidned

I always try to let mine idle for at least 30 seconds after I finish driving. I've been told this prevents the oil smoke from start up the next time. It allows the oil to drain back into the tank.

g_murray

Ditto - after I pull her into the garage, I let it idle for approx. 30 seconds before shutting her off.

I DO get a 'small blue puff' (SBP) upon start-up ...but that's normal.

G.

Scott 1996 993c2

I too let it idle a bit before shut-off.

Scott

csertich

I let mine idle for 30 seconds or so before shutdown. This results in less 'smoke' on start up the next time around.
chuck

David R

Same here - although for the practical reason of allowing me to eyeball the oil level guage before shutdown and then rest peacefully.

thomes

Ditto on all the above ... but I have to admit I just like to hear that low rumble bouncing off the concrete walls.

Ray Calvo

Smetims I let it idle, sometimes I don't. Generally I do, but this is largely to let the oil level stabilize so I can check it, not for any engine "blowout" purpose.

What I DO try to do is make sure I've driven the car easily for several minutes before stopping so that the oil temp can return to as close as possible to normal temp. I try to never shut off a hot engine.

Seems successful for 90K+ miles.

pcar964

I think the only thing you need to worry about it oil temp. Good practice is to warm up carefully, and cool down carefully.

I have also heard that a blip of the throttle RIGHT before turning off coats the rings with oil, which is good for the next start-up. But that might be bullcrap for all I know

ARM993

Glad to know I'm not the only one.

os993

Might be bullcrap. Used to be ok for old carbourator (sp?) engines, but not needed for ours. Actually might do more bad than good.

I let my car idle a bit before I shut down. I park, pop the front and get my stuff and then walk around and turn her off (love the Porsche left-hand ignition) - approx 30 sec idle. My car is doing great at 121k miles with no smoke at start-up, no major oil consumption and all systems GO to hit 200k miles soon!

Caveman

I'd heard that a blip just before turning off was bad for the engine as it washes off everything?

Bull

Best shut-down proceedure?........turn the key all the way to the left.

fnckr

Yesterday I shut off the car and then about ten seconds later turned the key to raise the windows. The rear blower turned on so I let it run for about twenty seconds and then took the key out.

Would our cars benefit from some kind of timer on that motor to prevent heat soak? Is there a better way of turning off the engine. It's only getting hotter now and I want to be gentle to Jessica.

Flying Finn

There is already a function like that. When the engine is warm, the fan in the engine compartments blows air for cooling.