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engine idle |
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69ambo 
AMC Apprentice 
Joined: Dec/16/2017 Location: PA Status: Offline Points: 36 |
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 Topic: engine idlePosted: Jun/22/2018 at 8:42am |
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Engine idles fine in park and neutral when put into gear idles rough and chugs like a locomotive. Timing good pertonix ignition installed,all vacuum lines replaced, carb rebuilt. New plugs,wires ,cap and rotor. Any help would be greatly appreciated.
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matty 401
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Joined: Jul/06/2007 Location: Iowa Status: Offline Points: 1727 |
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Posted: Jun/22/2018 at 12:17pm |
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it should idle about 750 in gear that is where my 304 matador idles
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72 matador 401 the beast
79 concord 2 door 72 matador 304 grasshopper 68 Rogue 406 93 Cherokee 4.0 5 speed |
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Boris Badanov
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Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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Posted: Jun/22/2018 at 7:10pm |
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IMO do a compression test.
It kinda sounds like exhaust valves are toast. |
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Gremlin Dreams
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Greyhounds_AMX
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Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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Posted: Jun/22/2018 at 7:35pm |
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In park what rpm does it idle at? Can you adjust it down to 650ish or so and check the timing? That way the mech advance won't be coming in yet.
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1968 AMX 390 w/T5
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69ambo
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Joined: Dec/16/2017 Location: PA Status: Offline Points: 36 |
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Posted: Jun/23/2018 at 8:50am |
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The car only has 28,777 miles on it supposedly, it is really clean for a 50 year old car. I will try all of the suggestion and see what happens. It starts right up and no smoke. I don,t know how long it sat before I got it. Could it possibly be a bad power brake booster causing a vacuum leak?
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matty 401
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Joined: Jul/06/2007 Location: Iowa Status: Offline Points: 1727 |
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Posted: Jun/23/2018 at 9:06am |
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easy way to check unplug the vacuum going to it and cap the port on the intake
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72 matador 401 the beast
79 concord 2 door 72 matador 304 grasshopper 68 Rogue 406 93 Cherokee 4.0 5 speed |
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PHAT69AMX
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Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5919 |
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Posted: Jun/23/2018 at 11:44am |
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It has to "stir up" the Transmission Fluid and run the Trans Pump when in gear.
It takes a bit to "stir up" and "heat up" and "loosen up" the Auto Trans Fluid imho A Stock Torque Converter holds a lot of Trans Fluid and are pretty low stall speed. imho when tuning an Automatic you have to go out and drive it or at least power brake while it in gear a couple few times against the torque converter to get it heated up and loosened up to see what the actual in gear idle speed drop is going to be...
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