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Reload this Page high idle/ black exhaust smoke

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Old 10-07-2009, 12:24 AM   #1
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Location: medford, oregon
Posts: 32
Car: I drive an 87 trans am and an 84
Engine: 87 has the 305 tpi 84 basic lg4
Transmission: 87 - 5 speed manual 84 - auto w/od
Axle/Gears: stock

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high idle/ black exhaust smoke
84 trans am 305 4brl carb. A/T. car was idling like crap when cold then once warmed up would idle real high and then diesel once turned off. i found that bolts on carb were loose and tightened them up. made a big difference but i still get black smoke from the exhaust and the idle when warmed up is really high and will actually accelerate my car without any help. once in park the idle is very high at about 1500 or more. i looked over the forums and didnt really find anyone with similar problems and or no reponse to say how it was fixed. car was sitting for 4 years before purchased but has had a tune up minus oxygen sensor. PLEASE HELP!!!!!!!
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Old 10-07-2009, 02:52 PM   #2
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Car: 82 Berlinetta(2)/57 Bel Air
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Sure sounds like the choke isn't opening up.
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Old 10-07-2009, 04:02 PM   #3
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Re: high idle/ black exhaust smoke
Either your choke is stuck or your carb needs a rebuild, which would probably be a good idea anyway.
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Old 10-08-2009, 02:30 AM   #4
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Join Date: Oct 2008
Location: medford, oregon
Posts: 32
Car: I drive an 87 trans am and an 84
Engine: 87 has the 305 tpi 84 basic lg4
Transmission: 87 - 5 speed manual 84 - auto w/od
Axle/Gears: stock

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Re: high idle/ black exhaust smoke
taking it to shop friday to have it timed and the carb looked at...thanks!!
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Old 10-16-2009, 04:54 PM   #5
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Join Date: Oct 2008
Location: medford, oregon
Posts: 32
Car: I drive an 87 trans am and an 84
Engine: 87 has the 305 tpi 84 basic lg4
Transmission: 87 - 5 speed manual 84 - auto w/od
Axle/Gears: stock

Classifieds Rating: (0)
Re: high idle/ black exhaust smoke
i see a lot of threads where no one posts what the actual fix was so here is my fix for this issue. the choke was the main issue. it was getting power but not working properly. the other issue had something to do with a purge control for the carb. i forget what it was called. car now runs a whole heck of a lot better...THANKS EVERYONE!!!
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