Need help with 84 CJ7 vacuum hoses!!!! - Page 3 - JeepForum.com

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post #31 of 107 Old 02-13-2013, 05:55 AM Thread Starter
Chuggins08
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I did the Nutter bypass but can't set the timing because I can't get it to stay running. Any ideas???


1984 Jeep CJ7
258 4.2L Inline 6
Motorcraft 2150 Carburetor
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post #32 of 107 Old 02-13-2013, 06:09 AM
Matt1981CJ7
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Quote:
Originally Posted by Chuggins08 View Post
I did the Nutter bypass but can't set the timing because I can't get it to stay running. Any ideas???
No clue, without more info.

Does it fire, then stall out? Or does it just crank, but no fire?

If it fires, does it run at higher RPMs, but not at idle?

What vacuum source do you have to the dizzy? How about to the PCV?

Is your choke operational?

Matt
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post #33 of 107 Old 02-13-2013, 06:29 AM Thread Starter
Chuggins08
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Runs for a few seconds then dies out

1984 Jeep CJ7
258 4.2L Inline 6
Motorcraft 2150 Carburetor
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post #34 of 107 Old 02-13-2013, 06:35 AM
Matt1981CJ7
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Can you see fuel spraying in the carb when it dies?

How about my other questions?

Matt
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post #35 of 107 Old 02-13-2013, 06:36 AM
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Fuel, Ignition, Air. We should be able to rule out air and when it dies, does it sound like it's starving? Can you manually rev it to see that you are getting fuel? If it just stops, I would lokk at your ignition source. Just my .02
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post #36 of 107 Old 02-13-2013, 06:45 AM
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Quote:
Originally Posted by spward View Post
Fuel, Ignition, Air. We should be able to rule out air....
Actually, until the OP confirms his choke is working, we can't rule out air, either.

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post #37 of 107 Old 02-13-2013, 06:48 AM
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Quote:
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Actually, until the OP confirms his choke is working, we can't rule out air, either.

Matt
Well, ya caught me.
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post #38 of 107 Old 02-13-2013, 07:07 AM Thread Starter
Chuggins08
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I can push the throttle and see fuel spraying, I have everything plugged vacuum wise except the hose from dizzy to Carb. Not sure if choke works or not, how can I check?

1984 Jeep CJ7
258 4.2L Inline 6
Motorcraft 2150 Carburetor
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post #39 of 107 Old 02-13-2013, 07:08 AM Thread Starter
Chuggins08
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It does seem to run at high rpms when it fires up

1984 Jeep CJ7
258 4.2L Inline 6
Motorcraft 2150 Carburetor
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post #40 of 107 Old 02-13-2013, 07:21 AM
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Upon cold start, push the throttle all the way to the floor. Do the choke flaps close all the way?

If it's an electric choke, check for power at the connection to the carb when the engine is running.

What should happen is the choke should close all the way when you floor the throttle before starting. Upon startup, the choke should open only part way. This is called a "choke pull-off", and it should only open the flaps about 1/8 - 3/16" initially. As the engine warms, the choke should gradually open, until the engine reaches operating temps, at which point the choke should be fully open.

Matt
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post #41 of 107 Old 02-13-2013, 07:24 AM Thread Starter
Chuggins08
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Im not home at the moment but I don't think it does anything when I put the throttle to the floor, what does this mean?

1984 Jeep CJ7
258 4.2L Inline 6
Motorcraft 2150 Carburetor
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post #42 of 107 Old 02-13-2013, 07:34 AM
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If that's the case, is means your choke mechanism is either broke, or improperly adjusted.

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post #43 of 107 Old 02-13-2013, 07:40 AM Thread Starter
Chuggins08
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Is that something I can fix easily? And could this be why its not wanting to stay running?

1984 Jeep CJ7
258 4.2L Inline 6
Motorcraft 2150 Carburetor
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post #44 of 107 Old 02-13-2013, 08:17 AM
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Chug,

It may, or may not, be your problem. A faulty choke will make cold starts an adventure, at best.

Usually, you can overcome a bad choke by massaging the throttle while the engine warms. That's assuming the choke isn't stuck closed. If it's stuck closed, then your engine may fire briefly, but it will quickly flood and die.

Matt
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post #45 of 107 Old 02-13-2013, 08:23 AM Thread Starter
Chuggins08
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Yeah sometimes if I pump the throttle while its running, it will stay running as long as I get giving it throttle

1984 Jeep CJ7
258 4.2L Inline 6
Motorcraft 2150 Carburetor
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