Oil in airbox

[gtrp]

Hello,

New to Porsches but I imagine a thin layer is not a good thing?

My car has trouble staying alive until it's fully warmed up.
It'll idle between 100-900rpms and stall. This will happen until I start driving it to get it warmed up, then it'll idle at 900rpms and be perfectly fine until i turn off the car.

Sounds like a vacuum leak as the car has zero change when I remove the oil cap as well.

[emcon5]

And your car is a...........

[gtrp]

Sorry it is a 1981 911SC. Lightly modded but nothing crazy.

[JJ 911SC]

More then likely to much oil in the tank or you don't have a restrictor in the oil breather line.

For the vacuum leak, spray some starter guild around all the connections and if the RPM's goes up, you found your leak.

[gtrp]

I do have too much oil in it... Dropped it off at the shop to change out my fuel lines and it seems I got a free quart or two of oil in my car...

[JJ 911SC]

Originally Posted by gtrp

I do have too much oil in it... Dropped it off at the shop to change out my fuel lines and it seems I got a free quart or two of oil in my car...

Drain some out.

On your dipstick, with the car running at operating temperature on a level surface after 1 minutes of idling, you should be half way between the low mark and the hight mark.

Get into the habit of when returning from a ride, to check the level as describe above.

Do not rely on the oil level gauge.

[gtrp]

Okay I did that after a good drive, couldn't get it to idle sitting still for 1 minute.

[JJ 911SC]

The idlin is just to let the oil return to the tank, it does not matter if its steady at 900 RPM or hunting.

So where was the oil level at?

[gtrp]

Max.

I only mention the idle because it's seems more troubling. It's causing my car to die at stop lights.

[Dodge Man]

My 80 US 3.0 conversion did not have the vent baffle & a slightly low oil level was super critical. Motor will hunt when you check oil running because the tank is open to ATM. Best of luck.

[JJ 911SC]

Originally Posted by gtrp

Max.

I only mention the idle because it's seems more troubling. It's causing my car to die at stop lights.

Take some out (about ¾ quart) and found those vacuum leaks.

[ClickClickBoom]

Originally Posted by gtrp

Max.

I only mention the idle because it's seems more troubling. It's causing my car to die at stop lights.

Vacuum leak, now the fun starts, get busy!

[gtrp]

Perfect, thanks!
I appreciate the help everyone. Love working on the porsche after work so this should be fun times.

Quote de gtrp

Max.



I only mention the idle because it's seems more troubling. It's causing my car to die at stop lights.

Take some out (about ¾ quart) and found those vacuum leaks.

[bpu699]

Originally Posted by JJ 911SC

More then likely to much oil in the tank or you don't have a restrictor in the oil breather line.

For the vacuum leak, spray some starter guild around all the connections and if the RPM's goes up, you found your leak.

Restrictor? Where is that? Just curious, as I have also noticed some oil in the airbox if the oil level is just a teeny bit high... I have never seen a restrictor

Bo

[lespaul]

Also curious about location of restrictor in oil breather line. I have a stock 78 SC.

[Paulporsche]

Idle hunting is often a sign of a too rich mixture. It may simply be set too high or your WUR (warmup regulator) may not be functioning correctly. It's also possible someone has raised the CO% to make up for air leaks.

There is a huge number of posts on finding vac leaks, setting the mixture and troubleshooting the WUR.

[gtrp]

Thanks Paul!

- Paul

Idle hunting is often a sign of a too rich mixture. It may simply be set too high or your WUR (warmup regulator) may not be functioning correctly. It's also possible someone has raised the CO% to make up for air leaks.



There is a huge number of posts on finding vac leaks, setting the mixture and troubleshooting the WUR.

[JJ 911SC]

Originally Posted by bpu699

Restrictor? Where is that? Just curious, as I have also noticed some oil in the airbox if the oil level is just a teeny bit high... I have never seen a restrictor

Bo

It fit in Oil Tank Breather Hose at the oil tank end.

Small piece like a reverse funnel to limit oil reflux into the crankcase.

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[scarceller]

I run my oil level just slightly below 1/2 mark, like 3/8 full. I have found that anything above 1/2 way tends to get oil into the breather hose and then into the intake on the 3.2L cars. I'm sure the SCs are in the same ballbark. Does the SC vent before the air funnel meter or after it? I assume they vent between the air funnel meter and the TB?

Bottom line is wet oil in the intake is not good as it will mix with intake air at WOT and reduce the fuels octane rating and could trigger detonation. You really want a nice dry intake track if possible.

[scarceller]

But what direction should it be installed in? I have seen them installed in both directions. My guess is that the best way for the device to be installed is with the funnel pointing toward the tank, not the most obvious direction for air flow but I do think it's best for keeping oil from passing the funnel. Oil normally sticks to the walls of the hose and is then sucked along the wall toward the intake. If you place the funnel as I suggest it sort of stops the oil right at the funnel since the funnel is backwards to the direction of the oil travel.

Thoughts? I've never seen a answer for this?

Originally Posted by JJ 911SC

It fit in Oil Tank Breather Hose at the oil tank end.

Small piece like a reverse funnel to limit oil reflux into the crankcase.

Pelican Parts - European Automotive Parts and Accessories - Porsche • BMW • Mercedes • Volkswagen • Audi • Saab • Volvo • MINI