1987Porsche944WithRealLongName

I noticed a strong fuel smell coming from my oil when I removed the cap. There was also some condensation and that gross white stuff under the lid. I changed the oil but the scent persists.

I haven't noticed any smoke and my wideband shows the usual fueling mix. I removed the vacuum lines coming from the fpr and damper and revved the engine some and didn't see anything, nor notice fuel in the lines themselves. I tested compression and it was just about a dead even 140psi across all 4. I haven't done any short drives lately and the fuel smell is still there after an hour long trip.

The only thing out of the ordinary is my car goes rich when the throttle is closed and it isn't warmed up yet. I hear a lot of burbles coming from the exhaust when its like this but once it warms up it starts cutting fuel on decel like normal.

Are there any other ideas as to what this could be?

Techno Duck

Check for leaking fuel injector(s).

1987Porsche944WithRealLongName

Is it possible for them to leak but fuel pressure leakdown to be good? My leakdown was actually longer than the specs on clarksgarage. I'm using 80# units from rogue.

1987Porsche944WithRealLongName

No other ideas at all? I pulled my fuel rail and didn't notice anything from the injectors.
It takes my fuel system a LONG time to bleed down, after 20 minutes its barely dropped 2psi.

My catch can I put back on just a week ago already had a tablespoon or so of gas smelling clear liquid. The car runs pretty well outside of the weird smell, have you guys even smelled your AOS during winter? Maybe it isn't just me?

How long does it take your car to warm up and stop doing the off throttle fueling condition? Mine has to pretty much be at normal temp for it to cut it.

thanks

Dave W.

You should hit decel fuel cut at any temp. The fuel cutoff point is higher when cold, but it's still there. Check your throttle switch/sensor adjustment and make sure your throttle cable has enough slack.
How long does it take for your engine to warm up? A cold engine runs richer, so you might be getting a little extra fuel in the oil due to extended warmups.

1987Porsche944WithRealLongName

Thanks, now I'm getting somewhere
After about 4 miles its warmed up enough to stop the enrichment and popping inside my exhaust.
I don't rev over 2300rpm when its cold, my throttle stuff is good.

Its worth mentioning that I have the A-tune

Dave W.

I'm more puzzled at how you can keep the rpm below 2300 when it's cold. My car is a complete slug until it's halfway warmed up.

67King

White stuff is normal. Blowby has water vapor in it, that is where it tends to condense. Fuel may be normal. You have a start-up strategy that has enrichment, you have pig-rich enrichment under load. If you don't just cruise around off-boost but up to temperature much, you may just not ever burn off the gas. Have you considered doing a used oil anaysis to see if you actually have an issue?

1987Porsche944WithRealLongName

I think I got to the bottom of this
My oil doesn't get hot enough

In summer it rarely goes over 180 but now I struggle to stay over 140. I guess my oil thermostat may be stuck open. I taped cardboard over it and went for a drive but it was the same story. Any ideas how to get that nice hot #2 bearing-killing oil temperature?
It might have something to do with my vented header panel too

Dougs951S

My header panel is vented, I have no issue getting my oil up to temp and I also run pig rich (like 12:1 rich ) on a cold start. The white stuff as stated, is normal. I'm also really curious how you manage to drive your car around under 2300 rpm, If I shift under 2800-2900 the car will fall flat on its face. It doesnt like to fall into the next gear under 2k rpm.

mahoney944

if your have gas in the oil you probably have an issue with your injectors, if you just put on the 80# injectors make sure you also install the correct chip set in the dme and klr to match them. installing the chips backwards will result in you injectors opening wide open too. Having the wrong chip set causes mixing too much or too little fuel, most cases more because people put bigger injectors in and over look the factory chips

1987Porsche944WithRealLongName

My afrs are usually fine so I don't think its a software issue

Anyway today I got back from a drive and went about my business. I went back to the car around half an hour later and noticed that I had very low fuel pressure, about 5psi.
Thinking I might have caught the issue I shorted the fuel pump and came back to check the leakdown 20 minutes later. It had barely sank to 40. Tried starting the car and checking back 20 minutes later, same story.

Do you think that my fuel might be heating up and expanding in the gas tank and pushing out through the injectors when the car sits? I've never noticed any woosh sounds when pulling the cap and I'm no stranger to it (own an NA miata)

Dougs951S

Is your tank properly vented, either via a vented gas cap or the factory gas vapor recirc system?

1987Porsche944WithRealLongName

Is there a picture of which of the lines on top of the gas tank leads to the ventilation?

1987Porsche944WithRealLongName

A friend turned me onto something called the blot test so I thought I would try it out.

The 3 drops on the right are oil from my pan
The 3 drops on the left are new oil left over in the jug (it looks like a ring because the paper didn't absorb it even after leaving it there for over an hour, the center is just a wet droplet)
I changed the oil about a month ago
What do you think?

https://i.imgur.com/FaLW9iW.jpg