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AMC 360 cranks slow when hot |
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
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What ever you do, don't leave one of them blasted dust off cans in the car, especially in the summer. In California it can be over 150+ degrees in a car when parked. Had a tech leave one in his console and It jetisoned out of the console and put a baseball sized hole in his windshield. We used pro quality high pressure duster cans. They type you screw on a trigger nozzle. They have a wee smiley under the can, which is used to vent when too much pressure is formed within the can. Them cans can freeze alcohol in seconds when upside down. It was a small gag to freeze in a coffee cup and watch it sputter and pop as room temp would not keep it in solid state. You could dump it in your cupped hand and it would be like pop rocks jumping out of your mouth. |
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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one bad rambler
AMC Addicted Joined: Jan/09/2008 Location: On The Island Status: Offline Points: 2007 |
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68 AMX 390 4 Speed,68 American,64 American 2 Door Wagon Altered Wheelbase,78 Concord Build 360,727,8.8
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FSJunkie
AMC Addicted Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4741 |
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Good cables: at least 4 AWG but 2 AWG is better. Keep the cables as short as possible. Clean and tight cable connections. Good starter relay. They get old and build up resistance inside. Good starter relay ground. Good starter to engine block ground. Good engine block ground to battery. Starters normally don't get appreciably slower when they are hot unless they are cooked by a set or headers or have something wrong internally. A good starter far from the exhaust system does not have that problem.
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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Boris Badanov
AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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In my experience I have never had an AMC V8 give hard hot starts
unless the starter is NG or over heated. Other possibilities? Bad timing, easy to diagnose, disconnect the coil and crank it. Excessive compression? Poor ring fitting? Poor piston fitting? localized severe over heat? Severely over heated intake heat stove? Bad cables are a bit of a reach, but they should screw up cold as well. |
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Gremlin Dreams
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Lucas660
AMC Addicted Joined: Apr/16/2012 Location: Vic, Australia Status: Offline Points: 1344 |
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Loctite makes a freeze and release spray that you could check the ignition module with. I think crc makes one too. Personally I would try jumper cables in between connections to test them. Run them in parallel with what's there. If it solves the problem replace that cable.
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Boris Badanov
AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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If it is ignition related simply disable the spark in some way and crank it.
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Gremlin Dreams
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jeep9393guy
AMC Fan Joined: Jul/08/2018 Location: Mansfirld PA Status: Offline Points: 15 |
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Had the battery tested , turns out to be junk . God a new deka 800 cca . Ill see what happens the weekend . Ill let you know the results . Frank
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jeep9393guy
AMC Fan Joined: Jul/08/2018 Location: Mansfirld PA Status: Offline Points: 15 |
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Looks like we have fixed it ! So far so good . Put in the new Battery cleaned every batt.cable ,put the factory cap and rotor on the distubuter ( had a two peace ford large cap and rotor ) stock ignition wires . set timing to 10BTDC so far starts hot good !
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