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cbass139
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Group: Forum Members
Last Active: 12 Years Ago
Posts: 183,
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So I have the engine running a ton better, thanks to you guys, but still not perfect. It is a 292 with original 2 barrell holley and a electronic mallory vacuum advance dizzy. Now it bogs down in the low RPMs of 2nd gear, like when I am turning a corner or have to slow for a light but not go down to 1st. It doesnt really do it when I have the choke pulled out a little and the RPMs are a little higher so I dont think it is the carb any more. I am thinking it is the Advance so I got a new spring set and figure I will try out some different combo's, any suggestions? Or do you think it is something else? Thanks in Advance, Cbass
1958 F100 292"Nothing is particularly hard if you divide it into small jobs." "Chop your own wood, and it will warm you twice." -Henry Ford
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cbass139
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Group: Forum Members
Last Active: 12 Years Ago
Posts: 183,
Visits: 898
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It is like somebody put a anchor on the truck between 1000 and 1500 RPMs in second gear and then releases it right at 1500. Crazy, sounds like the timing advance right?
1958 F100 292"Nothing is particularly hard if you divide it into small jobs." "Chop your own wood, and it will warm you twice." -Henry Ford
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The Master Cylinder
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Group: Forum Members
Last Active: 4 Years Ago
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I don't know what was done in the past, but it sound to me like you are a little lean in the transition between idle and midrange. You mention it runs better with the choke slightly out... and a higher RPM. Just my 1¢.
 "The Master Cylinder"
Enjoying life at the beach in SOCAL 
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cbass139
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Group: Forum Members
Last Active: 12 Years Ago
Posts: 183,
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What can I do to fix the leanness (is that a word) during the transition? Also if this was the case wouldnt I have the same problem in first and third gears?
1958 F100 292"Nothing is particularly hard if you divide it into small jobs." "Chop your own wood, and it will warm you twice." -Henry Ford
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Pete 55Tbird
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Group: Forum Members
Last Active: 4 Years Ago
Posts: 721,
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Cbass " So I have the engine running a ton better, thanks to you guys, but still not perfect. It is a 292 with original 2 barrell holley and a electronic mallory vacuum advance dizzy. Now it bogs down in the low RPMs of 2nd gear, like when I am turning a corner or have to slow for a light but not go down to 1st. It doesnt really do it when I have the choke pulled out a little and the RPMs are a little higher so I dont think it is the carb any more. I am thinking it is the Advance so I got a new spring set and figure I will try out some different combo's, any suggestions? Or do you think it is something else?" Something else. Without more information thats all you will get. How do you know the RPM, do you have a tach? Distributor advance at the low RPM you are saying it has the problem is very unlikely. And if it was it would be the same in all three gears not just second gear. How fast are you going and if you do have a tach what is the RPM range that the problem happens at? The carb has two circuits it runs through. Idle and transitions to main jet with the help of the accelerator pump shot of fuel. Is the pump from the squirters OK? Not enough data, Pete
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rick55
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Group: Forum Members
Last Active: 5 Years Ago
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If it bogs in second gear does it bog in top gear at the same revs. It should.
This still sounds to me like you have the same problem you have had all along. Changing jets and whatever has affected it but it still remains. It still sounds too lean if you have to close the choke and raise the revs. Are you sure you don't have a vacuum leak. I think you addressed the transition slots when you had the first problem.
Regards
Rick - West Australia
Do Y Blocks Downunder run upside down? Gravity Sucks!!
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cbass139
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Group: Forum Members
Last Active: 12 Years Ago
Posts: 183,
Visits: 898
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Yes I have a tach that is how I know that it is sluggish between 1000 and 1500 rpms and it is at low speeds like when you go around a corner, not when I am accelerating between 1st and 2nd. I guess I never have the truck that low in the rpm range in 3rd to know if it really does it then. I checked everything as far as the vacuum leak possibility goes and that first bog was only in first and it was fixed by getting the accelerator pump linkage dialed in.
1958 F100 292"Nothing is particularly hard if you divide it into small jobs." "Chop your own wood, and it will warm you twice." -Henry Ford
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Oldmics
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Group: Forum Members
Last Active: 5 Years Ago
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More carb jet necessary. As long as there are NO vaccum leaks. Oldmics
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Riz
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Group: Forum Members
Last Active: 2 Years Ago
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I would agree I was working through a similar problem recently and was convinced it was timing until I found a small crack in the PCV hard line When I was off the throttle and there were vacuum fluctuations it varied from rich to lean seemingly on its own, mine wanted to stall every time I came to a stop. I spent the better part of a weekend and a bottle of carb cleaner plugging everything I could think of before finding the crack (which actually expanded with heat) Felt like a moron when I finally found it, but turned out to be a $5 PCV valve and some spare hose rather than something sinister.
Mike Rizzo
1963 F100 "Rudy"
Daniel Island, SC
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cbass139
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Group: Forum Members
Last Active: 12 Years Ago
Posts: 183,
Visits: 898
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I feel like I might have it but with the weather I had to call it quits for today. Hoping to get some time tomorrow. I did change out the springs on the dizzy as well as the vacuum hose and then dialed in the timing to be perfect with the carb. I double checked the accelerator linkage and the squirt and that was all good. I was out in the cold for about a hr, wish I could get some exhaust venting like we have at work in my garage so I could do it in the heated garage. Maybe tomorrow I can drive it around and make sure it is perfect.
1958 F100 292"Nothing is particularly hard if you divide it into small jobs." "Chop your own wood, and it will warm you twice." -Henry Ford
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