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Re: 75 Duster carb issue
[Re: cdwmotorsports]
#3247554
07/26/24 10:55 PM
07/26/24 10:55 PM
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Joined: Jan 2003
Posts: 15,789 Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,789
Omaha Ne
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1975 emission systems had a factory work around where the egr was disabled and the vac adv hooked up to unported vauum etc. I owned such a beast and had the factory docs. Not anymore so in the meantime disconnect the egr, put the vac adv on ported
- you do not have the car set up properly with the timing so please pay attention.
Give the timing as much advance as it will tolerate without detonation I literally started messing with the timing yesterday at about 7:30 PM, it's a work in progress. I am working on a car that isn't mine. I don't know who has done what to it aside from what I have done. I am reporting what I find. I chose 6 degrees BTDC based on information gathered from a thread on the slant6 forums website. Some of the posts of the users there are gone so I got limited info for a baseline. Also any idea which spot is ported vacuum or how I can figure it out? The ported outlet should have no vacuum at idle and should increase as the throttle is slowly opened. Did you happen to verify that the timing is returning to its initial setting at idle and not hanging up or "floating" down? Also verify Total timing. ![beer beer](/ubbthreads/images/graemlins/custom/beer.gif)
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Re: 75 Duster carb issue
[Re: TJP]
#3247561
07/26/24 11:40 PM
07/26/24 11:40 PM
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Joined: Mar 2003
Posts: 1,514 Martinsville, IN
cdwmotorsports
OP
pro stock
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OP
pro stock
Joined: Mar 2003
Posts: 1,514
Martinsville, IN
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1975 emission systems had a factory work around where the egr was disabled and the vac adv hooked up to unported vauum etc. I owned such a beast and had the factory docs. Not anymore so in the meantime disconnect the egr, put the vac adv on ported
- you do not have the car set up properly with the timing so please pay attention.
Give the timing as much advance as it will tolerate without detonation I literally started messing with the timing yesterday at about 7:30 PM, it's a work in progress. I am working on a car that isn't mine. I don't know who has done what to it aside from what I have done. I am reporting what I find. I chose 6 degrees BTDC based on information gathered from a thread on the slant6 forums website. Some of the posts of the users there are gone so I got limited info for a baseline. Also any idea which spot is ported vacuum or how I can figure it out? The ported outlet should have no vacuum at idle and should increase as the throttle is slowly opened. Did you happen to verify that the timing is returning to its initial setting at idle and not hanging up or "floating" down? Also verify Total timing. Based upon n your statement about the ported vacuum the vacuum advance is already hooked to a port like that.
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Re: 75 Duster carb issue
[Re: TJP]
#3249198
08/03/24 11:12 AM
08/03/24 11:12 AM
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Joined: Mar 2003
Posts: 1,514 Martinsville, IN
cdwmotorsports
OP
pro stock
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OP
pro stock
Joined: Mar 2003
Posts: 1,514
Martinsville, IN
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That's good, disconnect + plug the port. See if the 60 mph surging goes away FYI this is on hold for now. It drives better still stumbles and has a lesser surge with the EGR unplugged and capped. My Demon needs to get buttoned up for dragweek and this isn't a priority until then.
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