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engine died today.... |
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bikerfox
Moderator Group Joined: Aug/02/2009 Location: USA Status: Offline Points: 4417 |
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Posted: Nov/24/2021 at 12:53am |
Jane died on a fwy on ramp today, a bit scary.
Made a gentle left turn onto the ramp. Suddenly, the engine lost power and the alt light came on. No noticeable electrical disconnects anywhere. Running an MSD RTR dizzy. About 1/2 hr. later, engine started up again, running roughly. One bizarre coincidence, perhaps, is the fact that when the key is turned to the off position, alt light comes on and the engine won't turn off unless the e' brake pedal is depressed. Thoughts?
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1969 Rebel SST (1970-1987)
1968 AMX (2005-2011) 1969 SC/Rambler (2011-2019) 1970 Javelin (2019 to ?)"Jane" |
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1BadJav
AMC Nut Joined: Mar/07/2008 Location: Las Vegas, NV Status: Offline Points: 342 |
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Could be the module in the distributor? The old Mallory Uni Lite distributors used to have problems with the uni lite module, where when they got hot they would quit working until they cooled down. Friend of mine had one in his Dodge and used to carry a spare module with him because of it.
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72 AMC Javelin SST - 401/727
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PROSTOCKTOM
Supporter of TheAMCForum Joined: Jun/20/2010 Location: Indiana Status: Offline Points: 2427 |
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I used to have an issue on a car because unknowingly I had replace a resistor wire with a regular piece of wire. Instead of sending 9 volts to the coil I was sending over 12 volts. Some days when it was cooler I never seemed to have an issue, but when it go warmer or I ran it hard it would leave me sitting wherever for a half hour and then run again. Once I put an aftermarket coil on the car that was rated for 12 volts constantly my problem went away. So anytime I read that the car died and then later it started and ran I always think of a coil issue. If it is the coil will be extremely hot when it happens. Good luck figuring it out.
Tom
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Molnar Technologies Full Service Dealer - Crankshafts & Connecting Rods
1969 AMC Rambler Rouge Race Car 1974 AMC Hornet Hatchback, Wally Booth Outlaw Nostalgic Pro Stock Race Car Project |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6758 |
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You have wired the RTR as per the MSD Addendum:
If not and using the factory ignition as a the power source, you need the alternator diode to stop run on. Tried briefly to find the schematic, but someone can put it up. Got to go.
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bikerfox
Moderator Group Joined: Aug/02/2009 Location: USA Status: Offline Points: 4417 |
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Yes, that relay is in place, but still the engine runs on. Still, the e' brake pedal depress to shut off is bizarre.
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1969 Rebel SST (1970-1987)
1968 AMX (2005-2011) 1969 SC/Rambler (2011-2019) 1970 Javelin (2019 to ?)"Jane" |
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bigbad69
Supporter of TheAMCForum Joined: Jul/02/2007 Location: Ottawa, Ont. Status: Offline Points: 6612 |
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If pressing the E' brake pedal activates a warning light in the dash, that is a clue. The light is providing a bleed path for "pent up" volts. I suspect either a module failure, or wiring fault.
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69 Javelin SST BBO 390 T10
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bikerfox
Moderator Group Joined: Aug/02/2009 Location: USA Status: Offline Points: 4417 |
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yes, when i depress the e' brake pedal, the dash light lights up. the fact that the ignition switch will only effect the engine shut off when the e' brake pedal is depressed makes me think that there is some connection bet. the two. i think i'm going to have to replace that switch.
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1969 Rebel SST (1970-1987)
1968 AMX (2005-2011) 1969 SC/Rambler (2011-2019) 1970 Javelin (2019 to ?)"Jane" |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6758 |
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AMC ignition switches are quite well made and modern relays takes little current to keep closed.
Is there any other circuit that is on that ignition start? Are all engine and chassis grounds checked and double checked? I'm thinking an after market tachometer may be wired to "leak" enough current to keep the relay closed. Or even the alternator field circuit. Check voltages and disconnect circuits before just replacing parts. The engine will run on just the battery for test purposes. A $2 diode may "fix" your issue. |
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bikerfox
Moderator Group Joined: Aug/02/2009 Location: USA Status: Offline Points: 4417 |
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I believe we added the $2 diode near the alt. or wherever it was supposed to be located.
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1969 Rebel SST (1970-1987)
1968 AMX (2005-2011) 1969 SC/Rambler (2011-2019) 1970 Javelin (2019 to ?)"Jane" |
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PHAT69AMX
AMC Addicted Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5903 |
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bikerfox - So this is in a 1970 Javelin is it?
Does it have the optional Headlight Warning Buzzer? |
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