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Erratic Idle Speed
#2498692
05/21/18 05:16 PM
05/21/18 05:16 PM
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Joined: Jan 2003
Posts: 1,194 Rochester, New York
GregY
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 1,194
Rochester, New York
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Hi Guys,
I had the 440 in my '71 Charger rebuilt last year. I didn't drive it a whole lot, but it ran fine.
I started it this spring and I am getting an erratic idle.
It's set at about 900 rpm, but it dips and revs between about 750 and 1,000 rpm as it sits there idling, and sounds terrible when it starts to idle down.
If I put the idle speed up to 1,100-1,200 rpm, it seems to mostly smooth it out, it might fluctuate 100 rpm, but not 250-300 rpm like it does at idle.
The car sat all winter without being started. I am wondering if this might be a vacuum leak, or what other possibilities might be.
Thanks for the help.
Greg
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Re: Erratic Idle Speed
[Re: GregY]
#2498696
05/21/18 05:45 PM
05/21/18 05:45 PM
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Joined: Jun 2004
Posts: 3,372 St. Charles, MO
wingman
Uncreative Title
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Uncreative Title
Joined: Jun 2004
Posts: 3,372
St. Charles, MO
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Could be about a dozen things, but if it were mine I would start on the fuel side, based on the fact that it has been sitting.
How long has the gas been sitting? Put some fresh gas in it. Carb could be crudded up. Especially check the idle adjustment screws.
1969 Dodge Coronet Super Bee 383 A4 1970 Plymouth Road Runner 440 FC7 (sold)
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Re: Erratic Idle Speed
[Re: GregY]
#2498722
05/21/18 06:34 PM
05/21/18 06:34 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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I would pull the idle mixture screws & shoot a 2 second blast of brake kleen or starting fluid into each hole with the thin red straw then replace the screws. If at first you count the # of turns down to lightly seated you can easily/quickly return them to their original position.
live every 24 hour block of time like it's your last day on earth
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Re: Erratic Idle Speed
[Re: GregY]
#2499312
05/23/18 01:33 AM
05/23/18 01:33 AM
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Joined: Jul 2011
Posts: 953 Chicago
PurpleBeeper
super stock
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super stock
Joined: Jul 2011
Posts: 953
Chicago
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My first three guesses.... 1. Vacuum leak, like a cracked hose or one that popped off 2. Bad gas....siphon out the tank completely...burn it off in your lawn mower or use 3 gal. at a time in your daily driver...and fill the tank with premium 3. A spark plug wire fell off (or one plug fouled)
70 Roadrunner convt. street car
440+6, NOS, 4-spd, SS springs
'96 Mustang GT convt. street car
'04 4.6 SOHC, NOS, auto, lowered
"Officer, that button is for short on-ramps"
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