79 intermitent start
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Freshman User
Joined: Apr 2004
Posts: 36
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79 intermitent start
I have a 79 f250 400, c6. if drive just long enough to warm the engine up then stop and shut it off it will crank at normal speed but wont start. I have fuel and spark. I swaped the modulator with an extra one i have and it didnt change anything. Once the truck cools down it will start on the first bump of the key again. just wondering if anyone else has experienced this. or if you think both modulators could have the same issue, and if you think a napa brand modulator is o.k. or should i try to find a motorcraft. thanks
Senior User
Joined: May 2006
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This *just* happened to me this weekend. Read this short thread:
https://www.ford-trucks.com/forums/5...-starting.html
The last post seems the most helpful.
https://www.ford-trucks.com/forums/5...-starting.html
The last post seems the most helpful.
Postmaster
Joined: Jul 2005
Posts: 3,248
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I think the modulators were good to start off.
Check the fuel filters, might have two.
What type of carburator is on your engine? Does it need a heat plenum?
Have you checked the timing of engine?
Check if any fuel lines are making contact with engine or engine related parts????
Make sure the fuel lines are not contacting the engine or hoses.
Check the coil?
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buck
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1975 F150 4x4, 4 speed
1975 F250, 4x4 4 speed
1976 F150, 4x4 4 speed
1978 F150, 4x2 5 speed
1992 Ford Aerostar AWD
Check the fuel filters, might have two.
What type of carburator is on your engine? Does it need a heat plenum?
Have you checked the timing of engine?
Check if any fuel lines are making contact with engine or engine related parts????
Make sure the fuel lines are not contacting the engine or hoses.
Check the coil?
--------
buck
------
1975 F150 4x4, 4 speed
1975 F250, 4x4 4 speed
1976 F150, 4x4 4 speed
1978 F150, 4x2 5 speed
1992 Ford Aerostar AWD
Thread Starter
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Freshman User
Joined: Apr 2004
Posts: 36
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thanks for the info. if it were vapor lock i think it would be an issue every time it got hot. it is factory carb and everything else because of california's ingenious smog laws.(doesnt matter how it runs as long as you pay to have all the original parts)sorry pet peve)) i should replace the fuel filter(s) and the timing is on, but bottomfeeders post made me try to pull the distributor and i cant. cant even rotate to adjust. sgtrwg said that fixed the problem so i will try it. i am curious though how that would keep it from starting. is the pickup expanding from the heat?, then arking or grounding? if so why would it not die while running? maybe i'm not thinking correctly or missing somthing. if someone is willing to explain that would be great. thanks again for the replys.
New User
Joined: Jan 2008
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The dizzy shaft gets worn and if the hole is now oval it will bind slightly.
These moving parts don't last forever
Also check your vacuum advance for being seized.
For un-seizing corroded distributors try this ....available at some marine supply places.
http://www.corrosion-control.com/corrblock.html
These moving parts don't last forever
Also check your vacuum advance for being seized.
For un-seizing corroded distributors try this ....available at some marine supply places.
http://www.corrosion-control.com/corrblock.html
