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Re: 440 Fluctuating Idle Speed
[Re: General 68]
#1644350
07/13/14 10:00 PM
07/13/14 10:00 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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that is a temp based vac valve in the water pump. there are no vac lines to it so it ain't affecting what is going on plus with the RPM rising and falling I'd think a vac leak would pretty much be a constant except possibly one inside the carb & I ain't even sure that a (vac) leak inside the carb would vary that much. Keep us posted
live every 24 hour block of time like it's your last day on earth
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Re: 440 Fluctuating Idle Speed
[Re: RapidRobert]
#1644351
07/14/14 02:41 AM
07/14/14 02:41 AM
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Joined: May 2005
Posts: 198
Chester, VA
tobnHisglory
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Joined: May 2005
Posts: 198
Chester, VA
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RapidRobert is right, that is a ported vacuum switch. It opens up internally as it gets warm but vacuum is supplied from a hose to the switch. It has no internal vacuum of its own.
You really need to sort out if this is carb or electrical related. Since you have replaced the rest of the electrical system, try taking your Ignition module in to AutoZone and having it tested. Make them test it several times until it gets hot to see if it starts to weaken.
Try spraying some starting fluid in the usual places to check for leaks - around the carb, vacuum hoses, and intake ports. Also, I've had vacuum leaks in the power brake booster do weird things at idle. Try temporarily plugging that hose/port.
-Reggie tobnHisglory2000@aol.com Former Mopars: 73 Charger - 440/727, 68 D200 Camper Special 383/727, 67 Satellite, 71 Superbee, 73 RoadRunner,2009 Ram Quad Cab Hemi 4x4 Current Mopars: 2005 Ram Quad Cab Hemi 4x4, 73 Cuda FE5 318 manual
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Re: 440 Fluctuating Idle Speed
[Re: Commando1]
#1644353
07/14/14 07:32 PM
07/14/14 07:32 PM
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Joined: May 2005
Posts: 198
Chester, VA
tobnHisglory
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Joined: May 2005
Posts: 198
Chester, VA
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It all depends on who you get Commando. I worked there as a manager for several years and if someone actually knows how to use the equipment, it can be a helpful place to start. I seriously doubt that is the problem on this motor but it can't hurt to check it out.
-Reggie tobnHisglory2000@aol.com Former Mopars: 73 Charger - 440/727, 68 D200 Camper Special 383/727, 67 Satellite, 71 Superbee, 73 RoadRunner,2009 Ram Quad Cab Hemi 4x4 Current Mopars: 2005 Ram Quad Cab Hemi 4x4, 73 Cuda FE5 318 manual
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Re: 440 Fluctuating Idle Speed
[Re: RapidRobert]
#1644354
07/14/14 08:42 PM
07/14/14 08:42 PM
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Joined: Feb 2005
Posts: 4,313
Prospect, PA
BSB67
master
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master
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Prospect, PA
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Quote:
... plus with the RPM rising and falling I'd think a vac leak would pretty much be a constant...
Vacuum leaks external to the carb can cause the engine rpm to wander at idle.
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Re: 440 Fluctuating Idle Speed
[Re: BSB67]
#1644355
07/17/14 10:20 PM
07/17/14 10:20 PM
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Joined: Dec 2012
Posts: 104
Arkansas
Nimbus426
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Arkansas
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Vacuum leaks external to the carb can cause the engine rpm to wander at idle.
Do you mean if the carb has a vacuum leak it can cause the rpms to wander? I think I might have one coming from the carb somewhere. There is a pretty loud air noise coming from the engine.
-ERIC
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Re: 440 Fluctuating Idle Speed
[Re: Nimbus426]
#1644356
07/19/14 06:22 PM
07/19/14 06:22 PM
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Joined: Dec 2012
Posts: 104
Arkansas
Nimbus426
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I messed with the timing a bit today and got the engine idling nicely in park and in drive. The engine idles now at around 6-7k rpm in gear. I went to take it for a drive but the car is still accelerating on it's own, especially in reverse. If I just barely tap the gas pedal it'll take off and keep accelerating for several seconds. It seems like the carb is getting too much fuel. Any suggestions? Thanks
-ERIC
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Re: 440 Fluctuating Idle Speed
[Re: Nimbus426]
#1644358
07/19/14 07:51 PM
07/19/14 07:51 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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Quote:
but the car is still accelerating on it's own, especially in reverse. If I just barely tap the gas pedal it'll take off and keep accelerating for several seconds. Any suggestions? Thanks
either the throttle cable/gas pedal/carb linkage/carb throttle shaft/butterflies on the throttle shaft are hanging up. EDIT I'm assuming you have a reasonably stout return spring
Last edited by RapidRobert; 07/19/14 09:10 PM.
live every 24 hour block of time like it's your last day on earth
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Re: 440 Fluctuating Idle Speed
[Re: RapidRobert]
#1644359
07/19/14 08:52 PM
07/19/14 08:52 PM
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Joined: Dec 2012
Posts: 104
Arkansas
Nimbus426
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Arkansas
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Yes sorry 600-700 RPM. It is a Holley 600 4bbl on a '73 440. I will check those things out. I'm pretty sure I can eliminate the gas pedal and throttle linkage. I'm pretty sure it is a carb issue.
-ERIC
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