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Unread 05-01-2013, 11:01 PM   #1
booboowv77
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1989 YJ Wrangler 
 
Join Date: Oct 2011
Location: Hedgesville, WV
Posts: 286
4 th Gear sputtering

Ok I have an 89,4.2, MC2100, 5 speed, hei distributor, SOA w/ 4.10 gears. The problem is when I shift into 4 th gear the motor seems to start sputtering although it is at 2000 rpms after shifting which is the same rpms as the other gears after shifting. Does anybody have any ideas what to check?
I have adjusted the timing from 10-14 BTDC and have adjusted the fuel mix to max vacuum and then some with no real changes. It's not the clutch because the motor just seem to be sputtering. I have also adjusted the vacuum advance which is run straight off the manifold. The only other thing I can think of is maybe the jets in the carb need to be changed. what do you guys think?

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Unread 05-02-2013, 07:33 AM   #2
Fenix85182
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It's only in 4th gear at 2,000 RPM? Does it do it at any other gear at the same RPM? Does it stop if you rev over 2,000 RPM in 4th gear?

I'd assume a fuel delivery issue, but if it only happens in 4th gear, I'm not sure. Maybe you only actually notice it in 4th gear?
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Unread 05-02-2013, 08:16 AM   #3
Siva283
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That just doesnt make sense. Are you sure it doesnt do it in other gears just less noticably?
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1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

[QUOTE=Magnum;14117863] I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim[/QUOTE]

[QUOTE=ldso;16498409]. It started with a $200 axle, and a few thousand dollars later I was done :)[/QUOTE]

[QUOTE=Luuca;16122017]diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...[/QUOTE]

[QUOTE=Overhead;17658665]this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.[/QUOTE]
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Unread 05-02-2013, 11:18 AM   #4
booboowv77
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Quote:
Originally Posted by Siva283 View Post
That just doesnt make sense. Are you sure it doesnt do it in other gears just less noticably?
It may be doing it slightly in 3rd but first and second really seem fine. it does seem to even out when it hits 2500+ rpms or so.
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89 YJ, Fresh 4.0, ax15, SOA w/410's, and about a million other things! :)
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Unread 05-02-2013, 11:59 AM   #5
Siva283
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When is the last time you did a tune up. Whats the condition of the spark plugs?
__________________
1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

[QUOTE=Magnum;14117863] I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim[/QUOTE]

[QUOTE=ldso;16498409]. It started with a $200 axle, and a few thousand dollars later I was done :)[/QUOTE]

[QUOTE=Luuca;16122017]diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...[/QUOTE]

[QUOTE=Overhead;17658665]this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.[/QUOTE]
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Unread 05-02-2013, 02:54 PM   #6
booboowv77
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1989 YJ Wrangler 
 
Join Date: Oct 2011
Location: Hedgesville, WV
Posts: 286
Quote:
Originally Posted by Siva283 View Post
When is the last time you did a tune up. Whats the condition of the spark plugs?
Just did the HEI swap in the fall with cap, rotor, wires, plugs are still perfect.
__________________
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89 YJ, Fresh 4.0, ax15, SOA w/410's, and about a million other things! :)
Built not Bought #759
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Unread 05-02-2013, 06:26 PM   #7
Fenix85182
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Maybe it's less about the RPM and more about the throttle position? Could it be that around 2,000 RPMs you happen to be hitting the gas harder in 4th gear than in other gears?

I haven't worked on a carburetor in these Jeeps in years now, but I would think a clogged fuel filter, clogged jet, or incorrect ignition timing could be the problem.
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1997 Acura 2.2CL
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