Car farts when shutting down...

[WJG2]

My '77 911, with a 3.0L, emits a flatulent "pffft" just as it shuts down. This does not seem to be a good thing. Also, is there any easy way to tell if a valve is burned, or a cylinder dead? Thanks.

[jluetjen]

What are you running for gas in the car? It sounds like my Mom's old '68 Olds 454 that used to diesel whenever it was shut off. Your's might be doing that too. It could be caused by excessive carbon build-up in the cylinders. A cheap test/solution might be to run a bottle of Techron through the system and see if that helps. It might be enough to clean up the cylinders and valves and alieviate the problem. If it doesn't, you really haven't lost anything except some carbon.

[Kemo]

mine farts all the time. in fact, i blamed my car the other day and i havent started her in a week!

[ginpunk]

Put some BEANO in it.

[WJG2]

Although I do like the Beano suggestion (both from a humor and expense perspective!), I'm hoping it doesn't signal a valve problem. I know what dieseling is -- and it's not that sound. It's a softer "pffft". There's also a highpitched squeal when I rev it in neutral. I should mention I just started it today after it sitting all winter. Thanks.

[AirCooledExcellence]

Take it off that high fibre diet

Cheers,

Tim.
____________
1983 SC Targa

[WJG2]

Hardy-har-har! I can't believe how you would-be Seinfelds (you don't have his wit or his collection of Porsches) are using my emotional crisis to test your wit! I ask about farting and I get exposed to cases of verbal diarrhea!!!

[Rot 911]

Doesn't sound like anything serious. The high pitched squeal in neutral is most likely a loose fan belt. The "pffft" noise on shut down is probably just a very slight run on, like just a revolution of the motor before piston compression brakes the flywheel. Could be a bit of carbon on a piston firing a cylinder one time after shut off. Try a bottle of Techron and see if that clears things up. You also might want to check your timing.

[WJG2]

Thanks, Kurt, for being the voice of reason. I'll take your advice. And the rest of you self-proclaimed funny guys -- keep your day jobs!

[jluetjen]

What am I? Chopped liver?

[WJG2]

Sorry, John. This emotional laugh riot has affected my manners. I will run some Techron through it as soon as my in-laws bring some back from south of the border when they return from their winter vacation next week. Thanks!

[porsche74]

Although the Beano & Techron suggestions cannot hurt anything (respectively, of course,... LOL), I'd sure check the torque of all your head studs.

That sound is also indicative of either a compression loss from a broken head stud, or perhaps an exhaust leak caused by a burned gasket or cracked flange.

Its worth following through on,........

[pwd72s]

"Sometimes when you cry, no one sees your tears.
Sometimes when you are happy, no one sees your smile.
But fart just one time..."-anon

[WJG2]

Thanks to everyone who contributed. Whatever the cause turns out to be, I appreciated each and every bit of input! Verse, no less!