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Author
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Topic: Effect of heat on timing
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70SportsRoof
Gearhead Posts: 777
From: Phoenix, AZ
Registered: Dec 2001
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posted 06-18-2002 10:55 AM
   
Okay, I'm not an expert in ignition systems, so maybe y'all can help me out with a question. A buddy of mine at work has a '69 Torino. He was telling me that when he drives the car for a while, 15 miles or more at a time, it starts to miss and sputter. It doesn't die, but just runs really sh*tty. I guess when it's cool and he only drives a few miles it's fine, no sputter or anything. I told him to check the plugs, check gap on points and plugs, make sure the cap and rotor are in good shape and get the timing readjusted. Anything besides that? I went for a ride in the car last night and the car just barely chugs a long at 30 mph when it's having it's little fit. It sounds like it's missing really bad. Any ideas, will the things I told him to check cure the prob? Thanks all.------------------
Gary-
1970 Mustang Deluxe SportsRoof (daily driver), 1946 Ford pickup, another 1946 Ford pickup, 1947 Ford parts truck, 1957 Ford Fairlane 500 Town Vic [This message has been edited by 70SportsRoof (edited 06-18-2002).]
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Moneymaker
Administrator Posts: 19751
From: Lyons, IL, USA
Registered: May 99
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posted 06-18-2002 12:20 PM
Check the vaccum advance operation.  ------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
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The Barry of BarrysGrrl
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70SportsRoof
Gearhead Posts: 777
From: Phoenix, AZ
Registered: Dec 2001
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posted 06-18-2002 04:06 PM
quote:
Originally posted by Moneymaker:
Check the vaccum advance operation.
Okay, time to hand me the stupid question of the year award....how do you check it out? Told you I know nothing about the ignition systems.
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Gary-
1970 Mustang Deluxe SportsRoof (daily driver), 1946 Ford pickup, another 1946 Ford pickup, 1947 Ford parts truck, 1957 Ford Fairlane 500 Town Vic
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65conv
Journeyman Posts: 28
From: wpb, fl
Registered: May 2002
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posted 06-18-2002 09:16 PM
just a suggestion. i had the same problem with mine. it was overheating and sputtering and missing after about 10 minutes of driving. reason: rusted thermostat not letting any coolant into the block.
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V8 Thumper
Gearhead Posts: 3529
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 06-18-2002 10:05 PM
quote:
Originally posted by 70SportsRoof:
....how do you check it out?
Real simple, first remove the distributor cap. Then disconnect the vacuum advance line from its source (usually at the base of the carb), not from the vac advance diaphragm itself . You may not have a hand operated vacuum pump; if not, seal your lips around the vac line and suck (no kidding). Observe the plate underneath the rotor in the distributor... it should pivot when you apply vacuum (suction) to it
[This message has been edited by V8 Thumper (edited 06-18-2002).]
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70SportsRoof
Gearhead Posts: 777
From: Phoenix, AZ
Registered: Dec 2001
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posted 06-21-2002 01:16 AM
Well, we tried that, and guess what, the plate never moved. The arm from the advance to the plate just barely moves, not enough to move the plate though. Looks like it's time for a new vacuum advance unit. Thanks guys.
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Gary-
1970 Mustang Deluxe SportsRoof (daily driver), 1946 Ford pickup, another 1946 Ford pickup, 1947 Ford parts truck, 1957 Ford Fairlane 500 Town Vic
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V8 Thumper
Gearhead Posts: 3529
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 06-21-2002 08:26 AM
 It really bites to not find anything wrong, because then you wind up looking like this 
Before you go buy another diaphragm, remove the one you have and then do the same test. The advance plate/mechanism in your distributor could be frozen some (nothing some penetrant couldn't help with)
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70SportsRoof
Gearhead Posts: 777
From: Phoenix, AZ
Registered: Dec 2001
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posted 06-28-2002 12:22 AM
Well, we checked the vacuum advacne again tonite, but this time with a vacuum pump thing, and the plate moved. I think he didn't get enough vacuum to make the plate move the first time. I went to take a closer look and found the wire that comes in from the side of the distrib body that grounds to the points was almost severed. All the copper strands except one were broken. Plus, every time the plate moved the connector had stress placed on it. I think it may have been grounding against the body of the dist. We replace the connector and routed the wire better. I think this will solve the problem. Thanks to all that helped us out here. ------------------
Gary-
1970 Mustang Deluxe SportsRoof (daily driver), 1946 Ford pickup, another 1946 Ford pickup, 1947 Ford parts truck, 1957 Ford Fairlane 500 Town Vic
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