Author Topic: 69 Z28 battery  (Read 1631 times)

Frank Perales

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69 Z28 battery
« on: September 27, 2018, 10:50:15 PM »
Hi. My 69Z28, with DZ302 is hard to start after it has reached operating temp.  Let sit, and cools down, no problem.  Checked timing, and battery.  All good.


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Re: 69 Z28 battery
« Reply #1 on: September 27, 2018, 11:57:43 PM »
Sounds like a starter motor heat soak issue, do you have headers or stock manifolds?
Tim in Australia.
'Fiasco' - 1969 04A Van Nuys Z/28. Cortez Silver, Dark Blue interior, VE3 bumper, Z21, Z23, D55/U17, D80, flat hood.
Sold at Clippinger Chevrolet in Covina, CA. Raced at Lions Dragstrip in Long Beach.


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Re: 69 Z28 battery
« Reply #2 on: September 28, 2018, 03:18:25 AM »
I had an issue with my 66 BB Chevelle like this. I installed a Moroso heat shield over the starter solenoid. Fixed
It is a quick fix and cheaper than replacing the whole starter, if thats what it is.

At least a good place to start. I figure the heat shield would even protect a new starter as well, if you have to go that route.
1969 garnet red Z/28 46k mile unrestored X77
-Looking for 3192477 (front) spiral shocks 3192851 (rear)
-Looking for an original LOF soft ray windshield
-Looking for original Delco side post negative battery cable part # 6297651AV

Kelley W King

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Re: 69 Z28 battery
« Reply #3 on: September 28, 2018, 11:37:02 AM »
Could be the starter but you might want to verify your timing marks, ect. If the balancer or timing cover has been replaced your timing might be off. Back off your timing a little and try it. It is simple and free.
69 Z28 RS Scuncio Hi Performance
69 SS L78
67 SS Chevelle
64 Corvette
66 GTO Tiger Gold
77 Trans Am Special Edition


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Re: 69 Z28 battery
« Reply #4 on: September 28, 2018, 03:40:02 PM »
My interpretation of his statement is at operating temp, the starter spins the engine normally but it does not fire immediately. A friend had this problem with his new '69 Z/28 and it was frustrating. Took a few trips to the dealer to sort it out.
Learning more and more about less and less...


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Re: 69 Z28 battery
« Reply #5 on: September 28, 2018, 06:01:54 PM »
Does John Z have a FACT sheet like the cooling system design and troubleshooting, if so that will contain a nice set of paths to the cure.

my .02 cents.
More description-definitions of the HARD TO START will help us shot-gun some T/S steps and corrective actions


68 SS/RS L35 Th-400 LOS
69 Pace Car L48 Th-350 LOS
68 Z28 M21 LOS


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Re: 69 Z28 battery
« Reply #6 on: October 03, 2018, 09:11:46 PM »
As William stated, I would guess it's cranking fine hot or cold, but would like a better description.

   This likely isn't your issue since you stated it starts fine cold, but one thing I often see missing on a points ignition car is the hot wire that runs from the "R" terminal on the solenoid up to the coil.  This provides a full 12 volts while the ignition is in the crank position.  Otherwise the points are dead while cranking and only light off once the crank position is released.  Sometimes makes starting a car that is still running points hit or miss, and most times requires more cranking than should be necessary to get the engine to fire.

Since it's a hot start problem, taking the starters ability to crank while hot out of the equation, most often it's the quality of the pump gas being used.  The ethanol fuel today is more susceptible to heat soak, especially if you're trying to run a lower octane.   Any part of the fuel system close to heat is at risk.  Some of it can be cured or subdued to some degree with various things you can do, but in some cases it may just be the nature of the beast.