1967 Mustang 289 Rough/Surging Idle, Carbon/Fuel, and Black Smoke! Please Help! - Vintage Mustang Forums
 
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post #1 of 4 (permalink) Old 12-19-2017, 03:34 PM Thread Starter
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Lightbulb 1967 Mustang 289 Rough/Surging Idle, Carbon/Fuel, and Black Smoke! Please Help!

Hey Guys!


My 1967 mustang has been parked for a while and has been driven once every couple of months/weeks. It would usually build up carbon and it would be cleared and everything would work fine after running it for a while.


However, I decided to clean and start using it regularly but once I decided to turn it on, I have been trying to figure out what is the issue here.

When I start the car and when its cold it idles fine and normal but there is some black smoke and black residue that shoots out from the exhaust. As the car warms up, it starts to idle rough or surges (it idles up and down constantly) but when I drive the surging stops but comes back when I stop. Also, when I press on the pedal and accelerate I can see a lot of black smoke from the exhaust behind me.

Do I need to replace the spark plugs? Clean or adjust the carb? Or what is the problem?

Thanks.
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post #2 of 4 (permalink) Old 12-19-2017, 05:09 PM
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Quote:
Originally Posted by ynasef View Post
Hey Guys!


My 1967 mustang has been parked for a while and has been driven once every couple of months/weeks.
How long was a while?

Allen

My build thread: Allen's Build Thread

My go fast build thread: Go Fast Build Thread
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post #3 of 4 (permalink) Old 12-19-2017, 05:14 PM Thread Starter
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Around 10 months. I would turn the ignition on and let it run every month or so. I know this worsens the carbon build up if I am not mistaken.
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post #4 of 4 (permalink) Old 12-19-2017, 07:59 PM
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Sounds to me like the choke is stuck on. With the engine warm, take off the air cleaner and look at the butterfly on top of the carb. It should be wide open.


68 GT Vert - J Code (1st car I ever drove in '73, dad bought it in '71)
67 C Code Vert Sports Sprint (1st car I ever bought in '75)
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