Hot Starting..Help - Team Camaro Tech
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post #1 of 5 (permalink) Old Jun 18th, 01, 06:32 PM Thread Starter
 
Join Date: Jun 2001
Location: Petaluma, CA
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Hello everyone..as the owner of two 67's(An RS convertibel and a SS396) I really enjoy this site and all of the knowledgable people.
I need a little help diagnosing a ignition problem with my ski boat. It has a Chevy 350 in it with standard points ignition. It start intially and runs fine. Problem is once you shut it off when it is warm it will not start again. The engine cranks, there is fuel in the carb(I pulled the airhorn of the Edelbrock and checked) it appears that there is spark as indicated by my timing light on one of the spark plug wires. It just seems like it is not getting any spark. The engine is not flooded(pulled spark plug and checked for moisture). Dwell is at 30 degrees, timing is at about 9 degrees BTDC. Is it possible that a weak spark could cause this. problem? All of the ignition components have been change except the spark plug and coil wires(tomorrow) Any suggestions for diagnosing...Why would this only happen when the engine is hot? Any help would be apprecitated.

Thanks

Scott
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post #2 of 5 (permalink) Old Jun 19th, 01, 05:51 AM
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Take a length of wire and go from SOL terminal on starter and to * + * terminal on coil. This assumes a resistor or resisance wire is installed between ign switch and coil. A weak spark will hinder hot starting.

Also, is the coil labeled correctly? Some times a coil will be made/marked wrong ands it's a pain to start when hot.

Check cranking voltage as well as coil voltage during cranking, should have no less than 10.5 volts.

Ever thought about giving a half a shot of gas before starting?

Everett 68/350/PG/11.90/115mph
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post #3 of 5 (permalink) Old Jun 19th, 01, 06:24 AM Thread Starter
 
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Thanks for your reply. I will try the wire to coil trick. I am actually a bit puzzled by the coil. It has a label which say use with external resistor...yet I see no resistor. Could this contribute to the problem? Is this what you are talking about when you ask if the coil is labeled correctly? I have suirted gas directly into the throat of the carb...no luck.

<BLOCKQUOTE>quote:</font><HR>Originally posted by Everett#2390:
Take a length of wire and go from SOL terminal on starter and to * + * terminal on coil. This assumes a resistor or resisance wire is installed between ign switch and coil. A weak spark will hinder hot starting.

Also, is the coil labeled correctly? Some times a coil will be made/marked wrong ands it's a pain to start when hot.

Check cranking voltage as well as coil voltage during cranking, should have no less than 10.5 volts.

Ever thought about giving a half a shot of gas before starting?

Everett 68/350/PG/11.90/115mph
<HR></BLOCKQUOTE>

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post #4 of 5 (permalink) Old Jun 19th, 01, 10:48 AM
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If there is no resistor or resistive wire, then the coil may be burnt internally due to 12V going to it at all times. As an engine heats up to operating temperature, it needs less primary voltage to run, hence, a resistor or resistive wire is inserted to lower the voltage, thereby, reducing the amount of current going through the point set and burning them up.

So, a swap out of coil may be needed,

Another place to look is point resistance, may have to take a file across points contacts to remove the carbon build-up. Usually want less than one ohm resistance across a set of closed points.

Ever think of changing to Petronix ignition?

Everett
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post #5 of 5 (permalink) Old Jun 19th, 01, 12:58 PM Thread Starter
 
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Found the problem...I checked the voltage coming to the coil, it was only 4 volts. I then checked the ignition switch. It turns out that one of the terminal connectors was loose and causing a bad connection. I suppose that this caused the wire to heat up under load and further increase the resistance to the point of not having enough juice.

Thanks for the help
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