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Unread 07-22-2007, 03:53 PM   #1
Jason Cramer
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1984 CJ7 
Join Date: Jun 2007
Location: Fort Collins Colorado
Posts: 2
engine sputters when shut off

What can I do to stop my engine from sputtering when I turn the key off?
CJ7 AMC 4.2 inline 6

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Unread 07-22-2007, 04:52 PM   #2
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1985 CJ7 
Join Date: Oct 2005
Location: The Granite State
Posts: 2,662
Sounds like time for a tune up. Try plugs and wires and cleaning the carb out. If that doesn't work, I would reset your timing which should fix it.
85' CJ7 Laredo, 383 GM, Turbo 350, NP 203. SOA, 2" frame lift, 34" TSL swampers, Dana 30 open, AMC 20 w/ detroit locker, 4:10's, 1 Piece Mosers, 35" boggers to abuse when needed.
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Unread 07-23-2007, 06:37 AM   #3
John Strenk
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1976 CJ5 
Join Date: Feb 2005
Location: Shalersville Ohio
Posts: 14,163
Also adjust your idle speed to lower than 900 RPM. If you can't do it then as Bard sugested you need a tuneup.

I couldn't get my jeep to idle lower than 950 RPM until I improved the ignition system with a TFI upgrade. Then I can lower the RPM to 550 RPM but generally I leave it between 650-750 RPM.
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Unread 07-23-2007, 11:52 AM   #4
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Location: Pensacola, FL
Posts: 280
Decarb it with Seafoam.
You might have carbon deposits built up in the combustion chamber.
Causing hotspots that continue to glow and thus ignite latent fuel after ignition is turned off.
Also known as dieseling.
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