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PorscheLover86 · Joined: 30 Dec 2010 Posts: 65 Location: Virginia

Recently i had the car sitting outside for a week or 2 while i waited on a new starter. I got the starter put it on, drained and refilled the oil and took it for a drive.. during that drive i heard a sound like a marble rattling around in the engine.. it stopped for a while but then came back as i was idling at a stoplight.. but i'm not sure about what it is.. anyone have any ideas?
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Black '77 924 N/A

Fifty50Plus · Posted: Thu Mar 31, 2011 1:11 am Post subject:

One possibility is a faulty injector leaning out a cylinder and causing an engine knock.
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1979 924 NA race car H-Prod SCCA
1982 924 NA race car - Sold
1981 924 Turbo sold
1982 924 Turbo sold
1972 911 E race car - traded for Cayenne Diesel
1975 914 1.8 Building for H-Prod SCCA

PorscheLover86 · Joined: 30 Dec 2010 Posts: 65 Location: Virginia

which may explain the decline in power. its also stuttering when im cruising.
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Black '77 924 N/A

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

What is your oil pressure gauge doing?
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

Martijnus · Joined: 29 Dec 2006 Posts: 2019 Location: Netherlands

PorscheLover86 · Joined: 30 Dec 2010 Posts: 65 Location: Virginia

well now. I can assure you all that that marbl sound was certainly not a ping.. That was my engines way of telling me you have 10 miles left. As I cruised down 95 at 75 In the far left lane.. That marble turned into a chatter which turned into a racket followed by my engine shutting down.. By the grace of god I was able to get it across 3 lanes of traffic and onto the shoulder where I restarted it figuring it can't get any wirse than this and limped it to the nearest gas station. I write this as I'm in the tow truck on the way home.. As a warning.. If you hear a noise from ur engine.. Ccheck it out.. Or have it checked out.. So you don't end up like this guy.
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Black '77 924 N/A

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Any holes in the side of the block?

Mmmm, ugly autopsy photos!
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Spun bearing? Rod knock?
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erstwhile owner of just about every 924 variant ever made

PorscheLover86 · Joined: 30 Dec 2010 Posts: 65 Location: Virginia

as soon as it stops raining the autopsy will begin and photo's will accompany the information.
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Black '77 924 N/A

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Harm · Joined: 02 Apr 2009 Posts: 1376 Location: Holland

First sound could suggest a broken oiltube hanging over the cam.
[ Excessive oil runs down the valves at #4 // Outlet valve #4 burns // Los of power // Running on three pistons ]

The abrupt ending sounds more like
eaten piston rings at piston one.
Was there excessive smoke?
Your plugs will help you proving that;
Picture a candle stub melting…

I have experienced both,
both without (marble) noise from the engine…
Just gradual loss of throttle responce.

Good luck.
Regards, Harm.
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Porsche 924 NA 1982 LY7A/A3A3 _ Greater driving pleasure never harmed anyone.

Brendan · Joined: 04 Jan 2011 Posts: 63 Location: Maine USA

I had a very similar problem in a 258 once. A main bearing cap bolt had backed out. The shaft of the bolt was still in the hole, but the head of the bolt was rattling against the oil pan. Sounded exactly like a bad knock. Noise increased with RPMs, etc.

In a 258, if you have 5 of 7 mains intact, there's usually no problems. In a four cylinder, it might take out the rest of the mains............

PorscheLover86 · Joined: 30 Dec 2010 Posts: 65 Location: Virginia

i'd bank on the oiltube.. Oil pressure dropped to zero immediately before the engine went out.. Sounded like a hammer slamming into metal over and over whenever I let out of the clutch. I'm gonna take it apart.. Lookin for a new engine now.
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Black '77 924 N/A

PorscheLover86 · Joined: 30 Dec 2010 Posts: 65 Location: Virginia

no smoke at any point..
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Black '77 924 N/A

emoore924 · Joined: 13 Apr 2004 Posts: 2822

I'm betting on a failed oil tube or something in the top end -- cam, cam follower, valve...tho that loss of oil pressure is not a good sign.

Sorry to hear. If you get pickies, please post. If you need parts, please post.