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Registered
Join Date: Mar 2004
Location: Las Vegas, NV
Posts: 317
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Little Black Pebbles?
heard some rattling comming from my exhaust pipes so i set it up on jackstands today and unbolted one of the junctions, shook it around a bit and small back pebbles fell out. in all it was a small handful of them but where did they come from? the Cat mayb?
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1983 944 Guards Red (87' Implant Complete) |
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04-24-2010, 03:52 PM
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You cat is toast. Same thing happened on my kid's 84 NA.
What we did on my kid's car was to take the cat off, then using a metal fence post, take all the remaining charcoal (or whatever it is) out of the cat. That stopped the little black pebbles, and have it a nice throatier roar. Or, conversely, you could by a new cat.
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83 944 NA - Black on black 86 951 - Red - SOLD 7/21 16 Ford Expedition He who hesitates is lost. |
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04-24-2010, 04:40 PM
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Coming up on your left...
Join Date: Nov 2006
Location: Albany, NY, USA
Posts: 695
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Going green is overrated.
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1986 Porsche 944 Turbo "S" clone  1998 Honda Accord  Siena College '08 Manager, Mavis Discount Tire 
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04-24-2010, 08:39 PM
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Registered
Join Date: Mar 2010
Location: Marshfield, MO
Posts: 355
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Poke it out with some rebar from Lowes and pull the honeycomb bits out. Cheaper than aftermarket exhaust. You still have the muffler so it won't sound overly tacky.
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1983 944 - project mode 2002 Ford F150 - every other daily driver 1976 Honda Goldwing - the other days |
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04-24-2010, 09:05 PM
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Redline Racer
Join Date: Jan 2007
Posts: 2,444
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Wear a N95 dust mask if you do. The ceramic dust is super fine and really nasty. I didn't and I was coughing up congestion for weeks. It doesn't take much.
 There are 3 layers you have to bust through, so there's alot of catalyst that has to come out.
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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky |
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04-24-2010, 09:34 PM
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Automotive Necromancer
Join Date: Nov 2006
Location: Beantown, MA
Posts: 1,544
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CAT woes
First: Modifying a cat is a violation of FED law. You should replace it with a good cat. Should you modify a cat...you would be foolish to publish such information on a public forum. Used Cats cannot be bought from boneyards, but can be bought from private individuals with parts cars and some individuals HAVE purchased entire parts vehicles for the cat alone (price a new one and find out why) There are after market cats and cross matching cats that fit but installing one of these may violate local or fed laws as well (or so i hear)
Later...
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There may be nothing quite as expensive as a cheap Porsche: Ruby Red 84 928S : White 87 924s 2.5L NA (Blinky) M44/07-43H10676 spoiler delete - 046/2B - Belts 9/12, Clutch and OC seals 8/08 andd Red 94 Del Sol: Please put your Make, Model and Year in Sig. Try not to break more than you fix. |
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04-24-2010, 09:52 PM
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Registered
Join Date: Mar 2010
Location: Marshfield, MO
Posts: 355
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In other words, its not intended for use on public roads wink wink.
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1983 944 - project mode 2002 Ford F150 - every other daily driver 1976 Honda Goldwing - the other days |
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04-24-2010, 10:05 PM
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Automotive Necromancer
Join Date: Nov 2006
Location: Beantown, MA
Posts: 1,544
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Gotcha.
Riiight...now we are getting the hang of it!
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There may be nothing quite as expensive as a cheap Porsche: Ruby Red 84 928S : White 87 924s 2.5L NA (Blinky) M44/07-43H10676 spoiler delete - 046/2B - Belts 9/12, Clutch and OC seals 8/08 andd Red 94 Del Sol: Please put your Make, Model and Year in Sig. Try not to break more than you fix. |
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04-25-2010, 08:38 AM
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Registered
Join Date: Mar 2004
Location: Las Vegas, NV
Posts: 317
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haha, well i guess itll just have to stay toasted then. i saw some of the aftermarket ones lindsey racing sells a high flow replacement that ill get when i can.
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1983 944 Guards Red (87' Implant Complete) |
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04-25-2010, 01:20 PM
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Registered
Join Date: Jan 2007
Posts: 2,370
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I replaced my cat with a universal one from the auto parts store along with a new o2 sensor to pass emissions. They make the universal ones at different lengths.
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04-25-2010, 03:47 PM
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My 951
My 83 NA
