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Unread 09-07-2008, 08:13 AM   #1
brianOU
Registered User
1988 YJ Wrangler 
 
Join Date: Mar 2008
Location: Oklahoma City, Oklahoma
Posts: 164
6cyl. Starts fine then dies? Whats the prob?

I have an 88 yj 6 cyl. Has been running fine.. put new plugs, new dist. cap, new plug wires, complete tune up...

but not new rotor bug.. the engine wasnt running good and found that I needed a new rotor bug. so i thought that was my problem..

but it wasnt, if i pump the gas, it will crank and run perfect for about 3 seconds. then dies.. so i changed fuel filter, and the fuel pump is new.. still have the problem. all vaccum hoses look good.

it will run if i hold the gas pedal down, but it wont idle.

any ideas?

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Unread 09-07-2008, 10:31 AM   #2
Alfons
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1992 YJ Wrangler 
 
Join Date: Jul 2005
Location: Ontario, Canada
Posts: 2,218
Have you checked the fuel flow? Contributors to slow or blocked flow would be:
  • Plugged fuel filter,
  • Malfunctioning fuel pump,
  • Carb that needs cleaning - try a rebuild kit.
  • Fuel tank fuel input assembly - part of the sender unit & has a screen on it that can become plugged. You need to drop the tank to change or clean this.
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Unread 09-07-2008, 10:51 AM   #3
88TNSahara
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1988 YJ Wrangler 
 
Join Date: Sep 2008
Location: Chattanooga, TN
Posts: 231
Check the choke assembly on the carb. The choke plate should be blocking off air flow when the engine is cold. On the stock carb, the plate should be in the horizontal position when cold. As the motor warms up, the plate should gradually open, allowing more air in, and the idle speed will begin to slow down. When fully warm, the choke plate should be vertical.
If your carb has an electric choke, check that the choke is closed before starting the engine when it's cold.
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Unread 09-07-2008, 05:11 PM   #4
brianOU
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1988 YJ Wrangler 
 
Join Date: Mar 2008
Location: Oklahoma City, Oklahoma
Posts: 164
i was wondering about the choke.... the plate in the carb is at about 45 degree angle. and its not moving much. should it be totally horizontal (closed) when its not running? i cant get it to move..
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Unread 09-07-2008, 06:51 PM   #5
88TNSahara
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1988 YJ Wrangler 
 
Join Date: Sep 2008
Location: Chattanooga, TN
Posts: 231
the choke should be closed (horizontal) when the motor is cold, and should be open when the motor is hot (vertical).
If it's stuck at a 45* angle, sounds like it might be your problem.
I think the position of the plate when the motor is off depends on how warmed up it was when it was last shut off.
Is your choke electric or manual? If it's electric, try moving the plate with the ignition switched on.
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