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Old 05-05-2013, 03:00 PM   #1
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help idk whats wrong with my T/A

My 1994 trans am is messed up i guess i was driving it the other day and it started to spitter an sputter so i shut it off and now every time i try and start it..... it kinda crackles an acts like it wants to turn over but it doesn't it just pops an blows black smoke out of my exhaust...... can anyone help me?
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Old 05-05-2013, 03:03 PM   #2
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Running rich? Check maf or maybe clogged cat or injectors
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Old 05-05-2013, 03:13 PM   #3
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How do i check the cat
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Old 05-05-2013, 03:46 PM   #4
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Use a vacuum gauge is there a check engine light or a gaseous smell?
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Old 05-05-2013, 04:03 PM   #5
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Quote:
Originally Posted by shadowspiyre99 View Post
Use a vacuum gauge is there a check engine light or a gaseous smell?
A vacuum gauge to check the cat?
I don't think so.

94firebirdtransam,
First thing I'd check is the ignition control module,
Take it off and take it to autozone and have them test it.
However, it's doing similar to what mine did when the optispark failed.
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Old 05-05-2013, 04:22 PM   #6
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You can check a converter with a vacuum gauge
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Old 05-05-2013, 04:24 PM   #7
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Thats coming right from my haynes manual although i dont know how well it will work
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Old 05-05-2013, 07:12 PM   #8
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Quote:
Originally Posted by shadowspiyre99 View Post
You can check a converter with a vacuum gauge
That's new one. Doesn't make sense though,
Unless the back pressure lowers cylinder charging enough to raise the vacuum.
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96 T/A, Black/Graphite Leather, T-Tops, 6 speed, 10 speaker Delco/Bose "Monsoon"
Original owner, 190k miles and counting.
Total engine rebuild at 187,020 miles.
AIR delete. Bored .030 over.
Comp cams Xtreme Energy LT1 266HR-14 street cam and springs..
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Old 05-05-2013, 08:15 PM   #9
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That's new one. Doesn't make sense though,
Unless the back pressure lowers cylinder charging enough to raise the vacuum.
If you drill a small Hole just before the cat, and put a gauge on it and get a high reading, it means your cat is clogged
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Old 05-05-2013, 09:02 PM   #10
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Quote:
Originally Posted by NavyVet View Post

That's new one. Doesn't make sense though,
Unless the back pressure lowers cylinder charging enough to raise the vacuum.
That's actually how the vacuum test is supposed to work. The only time I had a car actually do when I was working at the dealer the cat was so clogged the car would die after 4-5 min because the exhaust was so restricted.
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