HELP!, Carb's actin' up
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Joined: Nov 2004
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From: in the woods of Maine!
HELP!, Carb's actin' up
I have a 390 w/ a 2150 2V carb on it, it is a 1.21, the acc. pump is fine, my problem is that if I hold the gas pedal down steady, then slowly try to give it more gas, it just dies. It doesn't die quickly, it just kinda doesn't rev any higher when I give it more gas at first, then as I put my foot more into it, it just gets worse, then it finally chugs out.....I'm assuming it has something to do w/ my mixture adj. screws......any help would be great!, thanx
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From: Louisville,Ky.
Sounds like it is starving for fuel. The mixture screws only effect the idle. Make sure that the fuel filter is clean and the pump is pumping properly. Could have some dirt in the internal metering system of the carb.
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From: in the woods of Maine!
well I put in in-line filter on it, so I could see the feul, and before the carb went fine, and there was hardly any gas goin' thru the filter, I changed the feul pump because of other reasons, and the newer pump works good, cuz that clear filter is ALWAYS full, and ther is no dirt in any of the system, cuz I've cleaned it out pretty good, I put in jets that were one size higher, still did the wame thing, then I put in another size higher, still nothing....
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From: in the woods of Maine!
the vacum advance SHOULD be working...the vacum lines for it are all set, but the timing I know isn't right, cuz I don't have a light, and it's not on the road yet, so I got no way of getting to one, coz I've got it close....and I have no idea about the float level, or how to set it, or any of that
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From: Louisville,Ky.
I would first start the engine, take the vac. advance line off of the carb and put it on a manifold vacuum source. The idle should go up if the advance is working.
If it is ok, I would try advancing the timing a little to see if it helps any after returning the vacuum line to where it was.
If it is ok, I would try advancing the timing a little to see if it helps any after returning the vacuum line to where it was.
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From: in the woods of Maine!
well I only have one vacum line off my intake, and it's for the brake booster.....I put this motor together,m and my state hardly has any emissions laws, so the motor is rather bare.....so I only have 2 vacum lines on the whole thing....one for the brakes, and one for the adv. on the Dist......so if I have no other intake vacum port, then where can I put it?....can I put it on another vacum line on the carb that always has vacum?
as far as timing goes, to advance it, I turn it clockwise right?
timing's something I really know nothing about as far as what works better or worse, and also related to what kinda motor you have, and what your purposes are, and the specs of your cam, because my cam isn't stock, it's a Comp Cams "Magnum" cam.....if that really makes any difference...?...BTW, I put my timing set in straight up, because I was using the stock timing set
as far as timing goes, to advance it, I turn it clockwise right?
timing's something I really know nothing about as far as what works better or worse, and also related to what kinda motor you have, and what your purposes are, and the specs of your cam, because my cam isn't stock, it's a Comp Cams "Magnum" cam.....if that really makes any difference...?...BTW, I put my timing set in straight up, because I was using the stock timing set
Last edited by LedheadELH; Nov 28, 2004 at 07:10 PM.
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From: Louisville,Ky.
The vac adv should be connected to the port on the passenger side front of the carb. Usually just in front of the choke assembly on the bottom.
If you used a stock timing set, the cam is retarded 4 degrees. This will hurt low end performance.
Clockwise is correct to advance the timing.
If your advance is hooked to the manifold, then the timing is retarding when you accelerate. This could cause it to lay down too.
If none of this helps, you may need larger jets to compensate for the larger camshaft.
If you used a stock timing set, the cam is retarded 4 degrees. This will hurt low end performance.
Clockwise is correct to advance the timing.
If your advance is hooked to the manifold, then the timing is retarding when you accelerate. This could cause it to lay down too.
If none of this helps, you may need larger jets to compensate for the larger camshaft.
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More Turbo
Joined: Nov 2004
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From: in the woods of Maine!
no I have the vacum line pluged to the right one on the carb, that much I know, and always have known of, ALSO, I don't think it has to do w/ the jets& larger cam, this is because, I had the motor running EXCELLENT w/ this same carb, BUT, the acc. pum[p was bad, so I put my other carb on it(1.08 or whatever instead of the 1.21 that was one before). my other carb died out when I feathered it, so I swapped some parts, and put the other one(1.21) back on, and now I'm having this problem....so the 54 jets in it now worked fine w/ that motor before. BTW, I have no clue what either of the carbs were on originally.....a friend found both of em at the dump just sittin' there.....one had a bad acc. pump, and the other I'm guessing had the problem of running to rich.....
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From: in the woods of Maine!
so because I'm running the stock timing set, w/ a much bigger cam, my timing is going to need to be advanced alot?....like 12 or so sound right?.....dunno what it is now, but I've got it turned to the dist. is as far adv. as it can go...it's hitting the intake, so it can't go any farther
so would taking the dist. out, and moving it over another tooth be a god idea, or would it hurt more then it would help?
so would taking the dist. out, and moving it over another tooth be a god idea, or would it hurt more then it would help?
Last edited by LedheadELH; Nov 29, 2004 at 02:23 PM.
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From: in the woods of Maine!
Alright, I pulled a plug, and it was all black and sooty.....so that means rich correct?....and if it is, will going to smaller jets help?
I don't know if timing effects how the plugs work, but if it does, then that could be it, cuz my timing could be off a good ways for all I know....and if it is that, which way do I go to fix it?
I don't know if timing effects how the plugs work, but if it does, then that could be it, cuz my timing could be off a good ways for all I know....and if it is that, which way do I go to fix it?
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From: Louisville,Ky.
Yes too rich. I wonder if you have a bad powervalve in it.
12 should be ok on the ignition timing. The cam timing will still be retarded causing a loss of some low end power, but gain in the upper rpm range.
Maybe a couple of sizes down on the jets wouldn't hurt if the powervalve is ok.
12 should be ok on the ignition timing. The cam timing will still be retarded causing a loss of some low end power, but gain in the upper rpm range.
Maybe a couple of sizes down on the jets wouldn't hurt if the powervalve is ok.