Duraspark help?
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Tuned
Joined: Sep 2006
Posts: 250
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Duraspark help?
Hello all, I could use some assistance.
I have a 75 F150 with a 302 in it. I just put a cam, lifters, oil pump and water pump in it. The truck fires right up but after I drive it and then turn it off- it wont start until it completely cools off. When I try it almost sounds like the motor is timed incorrectly. The motor turns slow, and the battery acts like it is dead. When it cools it starts without hesitation. It is timed correctly and is very responsive when cool. I am trying to figure out which part in the ignition system is overheating. I replaced the control module and it still does it. Where should I check next? I have had several of these trucks so I have most of the parts on the shelf to interchange.
I have a 75 F150 with a 302 in it. I just put a cam, lifters, oil pump and water pump in it. The truck fires right up but after I drive it and then turn it off- it wont start until it completely cools off. When I try it almost sounds like the motor is timed incorrectly. The motor turns slow, and the battery acts like it is dead. When it cools it starts without hesitation. It is timed correctly and is very responsive when cool. I am trying to figure out which part in the ignition system is overheating. I replaced the control module and it still does it. Where should I check next? I have had several of these trucks so I have most of the parts on the shelf to interchange.
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Tuned
Joined: Sep 2006
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components
battery is new, starter is new, cables are new. The altenator is older, but I guess if I am getting 12v back out its good? How about the voltage reg- could this cause the battery to act dead?
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Tuned
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From: Decatur, AL
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If the problem just started after you changed out the above mentioned parts, i would think it is still timing related although you said it was correct, if the timing is to far advanced and it is hot it will give a similar symptom as you described.
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Tuned
Joined: Sep 2006
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problems
I am running stock exhaust manifolds and I think the clearence is good on the starter. This truck has been a project from the get go and really has never reliably ran. But this issue is new. I will test the battery and voltage reg this morning. But I keep going back to the timing- I was alway taught that you can throw the timing specs out once you put an aftermarket cam in. It is not radical- just a basic towing cam- 1500-4600 range and moderate lift and duration. I did time it at 6 BTC and it starts right up and is responsive. I was also taught to advance as far as you can until it pings under load and then retard a little. Should I be retarding this now and then check how it starts when hot?
Senior User
Joined: May 2010
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From: Florida
I was taught the same way for timing, i have a 67 Chevelle SS 396 with a radical cam, and it is timed this way. It has been timed this way for 20 years. When hot if it stalls on spinning over back the timing off a little untill this goes away.
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Tuned
Joined: Sep 2006
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F(ound) O (n) R(oad) D(ead)
Ok- getting 14 volts at battery- swapped out the coil and condenser and brain box- retarded the timing a few degrees- defintely not as responsive. Starts right up - drove it for a few miles- parked it- turned it off and tryed right again- it starts. gave it 5 minutes and no start?????
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Joined: Sep 2008
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From: near Pittsburgh
I learned just because your starter is new doesnt mean its good. I had purchaced so many "NEW" parts from the auto parts place only to find out that there crap. I just replaced my starter that was 3 months old how about that for quality control.
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