Re: Bad battery cause of a rough idle?
[Re: Belvedere1]
#2243698
01/29/17 11:36 PM
01/29/17 11:36 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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if you are at 20 that is in the ballpark & plenty high for now, I didn't know it was already that high.
live every 24 hour block of time like it's your last day on earth
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Re: Bad battery cause of a rough idle?
[Re: dogdays]
#2244605
01/31/17 12:33 PM
01/31/17 12:33 PM
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Joined: Sep 2003
Posts: 19,480 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,480
north of coder
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Here's a comment on a reply in this thread.
It is not recommended to run the car with the battery removed.
The sensing circuit will tell the voltage regulator to kick up to the max, say 19 - 20 volts. Any light or electronic gear on the car may fry due to overvoltage.
I once fixed a car that had been on a railcar and had to be driven off, but the battery was dead. They borrowed a battery from a passing taxi (not in the US) and used it to fire up the car. They turned on the lights, got it off the railcar, and then with engine running pulled the battery and put it back in the taxi. As they were removing the battery, they noticed all the lights burning out. The alternator also failed, developed a short in the windings. So we got to replace all the bulbs and the alternator on a brand new car.
Profit from my misadventure, don't do it.
R. and for those guys who like to check the charging system on our old heaps with the 35 or 45 amp alternators by removing one or the other battery cables, take heed of the above. same thing can happen, especially when you re-install the removed cable and the charging system surges. as said : "don't do it". use the proper meter[s] to diagnose the problem the correct way.
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Re: Bad battery cause of a rough idle?
[Re: Belvedere1]
#2245074
02/01/17 12:57 AM
02/01/17 12:57 AM
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Joined: Feb 2003
Posts: 16,150 Mesa, Arizona
dart4forte
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 16,150
Mesa, Arizona
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I hear you on going to a Holley and will make a few more adjustments and see if I can get the Edelbrock to work with what I have. I looked at some 850's on the Summit site earlier today. I'm not ready to go that route just yet but will make the change if necessary. No matter what it usually turns out to be something simple
“So if it’s on the internet it must be true”
Abe Lincoln
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Re: Bad battery cause of a rough idle?
[Re: Belvedere1]
#2245509
02/01/17 08:31 PM
02/01/17 08:31 PM
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Joined: Jan 2007
Posts: 2,212 Minnesota
peabodyracing
top fuel
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top fuel
Joined: Jan 2007
Posts: 2,212
Minnesota
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Really interesting problem.
I'm inclined to also think you're running lean, or on the ragged edge at idle. (hate those step up rods) I've had problems with throttle shafts leaking, and screwing up idle quality. Other than that, you're obviously competent enough to know if the base of the carburetor is warped, or the gasket not sealing well. If you spray carb cleaner around the base of the carb while idling does anything happen?
The air/fuel mixture density in the combustion chamber will be quite low compared to when the throttle is opened appreciably. That type of mixture tends to burn more slowly, and in my experience was a primary reason for the vacuum advance, which you say you don't have connected.
I know I struggled with a warmed over 331 SBC years ago that had a Mallory dual point in it, with no vacuum advance. Played with springs, weights, on and on, and things really only got better when I installed a distributor with a vacuum advance. It really cleaned up with idle/off idle characteristics of the engine.
Lead, follow or get the hell out of the way
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Re: Bad battery cause of a rough idle?
[Re: Belvedere1]
#2245648
02/02/17 12:08 AM
02/02/17 12:08 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Lincoln Nebraska
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Update: I blocked off the PCV port with a vacuum plug, no change to speak of doing that. Started playing with step up springs from the strip kit. I went down to orange spring and it cleaned up the idle a nice little bit. We're getting closer!
live every 24 hour block of time like it's your last day on earth
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Re: Bad battery cause of a rough idle?
[Re: Belvedere1]
#2308013
05/20/17 04:24 PM
05/20/17 04:24 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Lincoln Nebraska
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[/quote] I near the end of my patience here [quote] At this point just me I would (1) plumb a can of race gas or pump gas with no ethanol to the pump inlet & if no change then (2) borrow another carb.
live every 24 hour block of time like it's your last day on earth
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Re: Bad battery cause of a rough idle?
[Re: Belvedere1]
#2308020
05/20/17 04:34 PM
05/20/17 04:34 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Lincoln Nebraska
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the only reason I suggested race gas is that alot of areas of the US of A do not have the option of non ethanol gas at the pumps so that test would elim or confirm that the problem is the ethanol & it is infamous for causing idle problems, however obviously if you have non ethanol in there right now then we can bypass that test.
live every 24 hour block of time like it's your last day on earth
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Re: Bad battery cause of a rough idle?
[Re: Belvedere1]
#2308032
05/20/17 04:57 PM
05/20/17 04:57 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Lincoln Nebraska
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Would avgas be a reasonable thing to try?
I'm just curious too if I would run into this same situation with a 4150 Holley, like an 850 mech secondary carb. (1) I believe so. it does have differenct characteristics than race gas I'm sure but we'd at least have the gasahol out of there for a test (2) if the ethanol is the cause then likely yes, it'd act pretty much the same with another carb, the heat vaporizes it easier (not a problem in modern FI engines but problematic for us). if non ethanol does not fix it then I would borrow/try another carburetor as it might be strickly carb related/not fuel related. However when E10 was intro'd here in the 80's, cars dieing at stoplights from it were epidemic. EDIT on your 2nd post yes they should not be bouncing, can we block them all the way down (on cruise) for a test
Last edited by RapidRobert; 05/20/17 05:00 PM.
live every 24 hour block of time like it's your last day on earth
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Re: Bad battery cause of a rough idle?
[Re: Belvedere1]
#2308045
05/20/17 05:24 PM
05/20/17 05:24 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
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Posts: 14,889
up yours
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No matter what I have done the metering rods wont stop bouncing. If I could get that corrected I would have progress I feel like. A previous post on this thread mentioned the vacuum signal being the cause and the carb is "confused" as to whether its on the idle or main circuit. Read up on vacuum gauge readings, might help point you. http://www.secondchancegarage.com/public/186.cfm
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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