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Old 06-01-2009, 11:50 PM   #1
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Jeep Timing advance vacuum

my degrees going from idle to 2500 rpms only changes slight ly when its supposted to change more. I need to figure out where the timing advance vacuum line is and if that is going to solve my problem

has anyone had this problem? its keeping me from passing smog so yeah the problem again is that the degree on the timing going from idle to 2500 rpms isnt changing. whats the problem?

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Old 06-02-2009, 12:43 AM   #2
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Hello Does anyone know how to help me here? Just a question if you have no idea at least tell me you have no idea.

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Old 06-02-2009, 04:45 AM   #3
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The advance diaphragm, should be connected to "Ported" vacuum.
In Cali, I'm pretty sure you still have the BBD. I know the MC2100's port is on the passenger side, in front of the choke assy, not sure about the BBD.

The on board computer has control over the vacuum advance, unless you've Nuttered it.
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Old 06-02-2009, 05:36 AM   #4
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Hello Does anyone know how to help me here? Just a question if you have no idea at least tell me you have no idea.
I have no idea how to help you. BTW you posted at around 1am eastern time, dont expect alot of responces at that time
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Old 06-02-2009, 07:48 PM   #5
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my degrees going from idle to 2500 rpms only changes slight ly when its supposted to change more. I need to figure out where the timing advance vacuum line is and if that is going to solve my problem

has anyone had this problem? its keeping me from passing smog so yeah the problem again is that the degree on the timing going from idle to 2500 rpms isnt changing. whats the problem?
Re-read your post.

vacuum advance line is the rubber tube leading from the distributor, to the carburetor. It may go into a "tee" before getting to the carb.

The stock distributor comes with tight springs, on the advance plate.
While you can get lighter springs, (Mr.Gasket #925D) they aren't legal for "on-road use".
Again, your on board computer (Behind glove box) may not be calling for advance at 2500 rpms.

These old computers, & emissions systems can get screwy after years of neglect.( there is an indicator, somewhere under the dash if it hasn't been disabled. It's supposed to tell you when emissions service is required.)

John Nutter's fix for this, should be passed into law!
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Old 06-02-2009, 11:13 PM   #6
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sweet ill check it out im rebuilding the carb right now. its pretty fun so far
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Old 06-03-2009, 04:56 AM   #7
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sweet ill check it out im rebuilding the carb right now. its pretty fun so far
It's a shame you couldn't do the MC2100 swap!
But in California, you'd need to have a state inspector in the family to get away with it.
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Old 06-03-2009, 11:54 AM   #8
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Lol yeah that would be cool but I don't know anyone on the inside
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Old 06-03-2009, 08:52 PM   #9
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Lol yeah that would be cool but I don't know anyone on the inside
The guys who did my Pa. inspections, really enjoyed the $30.00 lunch thing.

Be careful though, not sure of the Cali laws on fast food bribery. Prolly illegal like everything else!

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