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New 401 AMX |
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sidefx
AMC Apprentice Joined: Oct/22/2017 Location: Ohio Status: Offline Points: 51 |
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Posted: Oct/22/2017 at 2:56pm |
I have recently inherited my grandfather 1971 AMX 401 with 30k original miles.
The first issue is a cold start thud that goes away once the engine is warm. Could it be a stuck lifter or rocker arm out of adjustment? http://youtu.be/feZIeUjiJg8 - http://https://youtu.be/feZIeUjiJg8 The next issue is really poor fuel mileage and just recently some stalling issues. I have only ~50 miles since I last filled up and have used a half tank already. I have been trying to gradually clean out the engine since it probably hasn't since over 3000 rpm in years. I think some of the 4500 rpm runs might have knocked the points out of adjustment and maybe the carb needs cleaned out. As for the points I'm looking to convert it over to electronic with a kit from Pertronix. Should I go with either the ignitor I or II? And should I match it with their flamethrower coil? As for the carb the stock 4300 doesn't have really good reviews out there. So I'm wondering what the best option would be for my car, its an automatic.
Edited by sidefx - Oct/23/2017 at 6:54am |
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gremlinsteve
AMC Addicted Joined: Dec/16/2008 Location: houston Status: Offline Points: 884 |
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Is this car in good condition
You are better off not hacking on a car that is If it's been sitting for some time today's fuel turns to varnish type crap It's probably going to need a new filter A gas tank cleaning. A carb rebuild and you might even have sticking valves from it Post pics so we car guide you in your quest |
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ramblinrev
Moderator Group Joined: Dec/28/2008 Location: Wisconsin Status: Online Points: 11471 |
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The 'knock' sounds like the very typical AMC V8 exhaust leak that sometimes quiets down after the system heats up. It's likely the 'donut' and or the 'heat riser' valve on one side of the exhaust. Like was mentioned above, clean the tank and rebuild the carb if that hasn't been done. Show us more pics! (Though you have to have 30 posts to put pictures on here, you can put them on a photo hosting site like Flickr and put the link here). |
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74 Hornet Hatchback X twins (since 1977)
62 American Convertible (still worth the $50 I spent in 1973!) AMCRC #513, AMO #384 70 AMX 360 4-speed (since 1981) |
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scott
AMC Addicted Joined: Jul/10/2007 Location: Wildwood Pa. Status: Offline Points: 3498 |
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I have Motorcraft 4300 carbs on two of my cars & love them. They are different from a Holley or Carter, so you need to know what you are doing with them when you rebuild them. I'd rebuild what you have long before I would spend the money on a different carb. If you decide to get rid of the 4300 I'll be happy to take it off your hands.
The 71 401 Javelin AMX is one of the more valuable AMC's. Don't start hacking it up with a bunch of aftermarket garbage or you'll lose value. |
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sidefx
AMC Apprentice Joined: Oct/22/2017 Location: Ohio Status: Offline Points: 51 |
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I understand not hacking on the car but want something reliable. I think the Pertronix unit keeps that and maybe the 4300 can be tuned up.
Here’s some photos from cars and coffee. https://www.flickr.com/photos/28824163@N05/shares/4LUvEs - https://www.flickr.com/photos/28824163@N05/shares/4LUvEs Edited by sidefx - Oct/22/2017 at 7:10pm |
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gremlinsteve
AMC Addicted Joined: Dec/16/2008 Location: houston Status: Offline Points: 884 |
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Pertonix is fine in my opinion
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amcenthusiast
AMC Addicted Joined: Jul/02/2012 Location: SW Atlanta GA Status: Offline Points: 1778 |
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(gawking) don't try to drive it anymore; you need to find an AMC angel to help you repair all it's neglect abuse
It's not wise to damage the collector car's value. IMO, the first thing you should do is contact the nearest AMC club and ask for someone there to help you with your situation. Next you need to buy the books: a '71 AMC Technical Service Manuel, a Chilton's Repair Manual I would not even sit on the seats until I knew their vinyl sides are treated to restore their flexibility. It has corduroy seat inserts? those are beautiful do you have them covered up with clean beach towels? sheesh man don't you know coin collectors don't even touch their coins to reduce their value? IMO you need to be looking up and reading every article you can find on 'how to revive a classic car out of storage' |
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443 XRV8 Gremlin YouTube video: https://www.youtube.com/watch?reload=9&v=2DmFOKRuzUc
XRV8 Race Parts website: http://amcramblermarlin.1colony.com/ |
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Sonic Silver
Supporter of TheAMCForum Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7903 |
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The 1/2 tank you have used in about 50 miles may be your fuel gauge or sending unit. Unless you filled it up to the top, drove 50 miles, refilled it to the top, and figured your gas mileage correctly, I wouldn't rely on a gauge reading. I meant to add that your car only holds 16 gallons of gas, so if the gauge is dead accurate, then that would be a little over 6 miles per gallon. I doubt you would get much over 10 around town, with some acceleration. You could easily use 1/3 of a tank in that situation. Edited by Sonic Silver - Oct/22/2017 at 8:30pm |
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sidefx
AMC Apprentice Joined: Oct/22/2017 Location: Ohio Status: Offline Points: 51 |
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I only know 10 gallons from 1/4 tank. I should have said cold starts have to be made with starting fluid.
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73Gremlin401
Supporter of TheAMCForum Joined: Mar/02/2013 Location: Stmbt Sprgs CO Status: Offline Points: 941 |
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Slightly off topic - but get that car to an alignment shop. The amount of negative camber in the front end will destroy those tires in no time. It does look like the front end has been lowered, which is fine, but perhaps that was done and never got the camber change compensated for.
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73 Gremlin 401/5-spd.
77 Matador Wagon 360/727. 81 Jeep J10 LWB 360/4-spd 83 Concord DL 4-dr 258/auto |
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