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Re: Ignition problems- 305E V6
Jimmy66 #1394891 Fri Jan 29 2021 05:00 PM
Joined: Feb 2004
Posts: 22,387
H
'Bolter
On a conventional point type ignition system, the only time the voltage at the coil + terminal will show reduced voltage downstream of the ballast resistor is when the points are closed and current is flowing through the coil. If the voltage at the coil is checked with the points open you'll see full battery voltage since no current is going to ground through the points. I have no idea what, if any voltage you'll see if some sort of electronic ignition system is involved. A factory GM HEI system needs to see a cranking signal from the reluctor before any current starts to flow in the coil. That's a "fail safe" built in that the Pertronix doesn't have, to prevent damage in case the ignition switch is left on.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Ignition problems- 305E V6
Jimmy66 #1394905 Fri Jan 29 2021 06:54 PM
Joined: May 2005
Posts: 8,164
B
Sir Searchalot
When the jumper was used from battery to coil it eliminated any feed problem for the Pertronix and the coil, it still did not start. I see what you mean about not seeing the drop unless points closed. I'm betting/hoping on timing/dizzy plug wires. Last heard from Jimmy three hours ago.

EDIT: It fluctuated between 10.7-11 while cranking. This is with Pertronix. It would have to start, key springs back to on, to allow resisted voltage to take over.


Watch out for careful drivers!!!
I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.
Sometimes no nonsense makes sense, in a sense
You can't teach a new dog old tricks.


Re: Ignition problems- 305E V6
Jimmy66 #1394909 Fri Jan 29 2021 06:59 PM
Joined: Jan 2021
Posts: 49
J
Jimmy66 Offline OP
'Bolter
Checked firing order of plugs on distributor cap, it was right. Moved the all one tower over clockwise, will not start. Same as before. Going back through this thread I read the spark plug gap is .035, I have .046 in there and they are not adjustable, fixed gap. Could this be the culprit? Bigger gap takes more voltage to jump?


Jimmy Deveney
‘66 GMC 3/4 ton pick up
4 speed manual
305E V6
Re: Ignition problems- 305E V6
Jimmy66 #1394917 Fri Jan 29 2021 07:26 PM
Joined: May 2005
Posts: 8,164
B
Sir Searchalot
Yes, I already said your order was right from looking at the pics. Yes, a big gap can prevent starting but .011 should get a fire or two. We don't know why you have that plug? What plug you asked for. Makes me wonder if your other parts are correct for 1966 GMC 305 V6. Parts counter guys or internet application charts probably never heard of that motor.
Find TDC at compression and check rotor. I do it with a remote starter switch (jump the starter switch) and center plug on dizzy removed.

Quote from Pertronix for Ignitor II:
In stock applications, the manufacturer's recommended spark plug, and
spark plug gap will work best. For performance applications, the spark gap
may be increased up to 0.010” from manufacturer’s specifications to take
advantage of the extra energy produced by the Flame-Thrower II coil.
Since PerTronix cannot test every configuration, the end user must
determine what spark plug gap works best for their application.


Watch out for careful drivers!!!
I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.
Sometimes no nonsense makes sense, in a sense
You can't teach a new dog old tricks.


Re: Ignition problems- 305E V6
Jimmy66 #1394918 Fri Jan 29 2021 07:31 PM
Joined: Jan 2021
Posts: 49
J
Jimmy66 Offline OP
'Bolter
I ordered those spark plugs online and pick them up at a store, during the height of the pandemic, when you couldn’t go shop anywhere. It’s hard to find auto parts shopping sites that know this engine. It was the best I could do at the time. I plead ignorance.


Jimmy Deveney
‘66 GMC 3/4 ton pick up
4 speed manual
305E V6
Re: Ignition problems- 305E V6
Jimmy66 #1394919 Fri Jan 29 2021 07:33 PM
Joined: Jan 2021
Posts: 49
J
Jimmy66 Offline OP
'Bolter
I moved everything over one, as I said, rotor is currently just past UDC, and rotor is pointing just past where I had 1 originally. Should I put them back?


Jimmy Deveney
‘66 GMC 3/4 ton pick up
4 speed manual
305E V6
Re: Ignition problems- 305E V6
Jimmy66 #1394920 Fri Jan 29 2021 07:35 PM
Joined: Jan 2021
Posts: 49
J
Jimmy66 Offline OP
'Bolter
I mean crank is currently just past UDC


Jimmy Deveney
‘66 GMC 3/4 ton pick up
4 speed manual
305E V6
Re: Ignition problems- 305E V6
Jimmy66 #1394922 Fri Jan 29 2021 07:40 PM
Joined: May 2005
Posts: 8,164
B
Sir Searchalot
Well there are two UDC positions, that's why it has to be the one that appears when there is compression, like you can feel with your thumb at the no. 1 hole. Which is drivers side front. The rotor would be just past no. 1 (lag) so does seem you had in correct place. Tripple check that.
Just past would be just past CW.


Watch out for careful drivers!!!
I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.
Sometimes no nonsense makes sense, in a sense
You can't teach a new dog old tricks.


Re: Ignition problems- 305E V6
Jimmy66 #1394923 Fri Jan 29 2021 07:44 PM
Joined: Jan 2021
Posts: 49
J
Jimmy66 Offline OP
'Bolter
If I’m gonna change plugs, should I take them out and then I’ll theoretically be able to turn crank to TDC by hand? Or by belt? Without compression? See where rotor is?


Jimmy Deveney
‘66 GMC 3/4 ton pick up
4 speed manual
305E V6
Re: Ignition problems- 305E V6
Jimmy66 #1394924 Fri Jan 29 2021 07:45 PM
Joined: Jan 2021
Posts: 49
J
Jimmy66 Offline OP
'Bolter
I’ll mark wires for which plug beforehand.


Jimmy Deveney
‘66 GMC 3/4 ton pick up
4 speed manual
305E V6
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