New Dist Cap, Rotor, Bushing - Now No Start 74 T/A?

MART60 · Mar 31, 2025

After replacing about 35 parts on the 74 455 that sat for 32 years, I took it down the lane to get the mail for 2 days & it ran great.

But I can never leave well enough alone.

Put on New GM plug wires, dist cap, rotor, brush, and seal.

Now has Weak Spark and Just Cranks.

Just ordered the missing tach clip.

Put the old rotor, brush & seal back on & no change.

Strange!!

Thanks, One and All,
Mart

Knightrider189 · Mar 31, 2025

Have you replaced the coil?

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MART60 · Mar 31, 2025

No, but I don't see how the Coil that worked great 15 minutes earlier could have gone bad just by replacing the cap, rotor, brush & seal.

I have it set right on TDC now and will go from there.

Thanks,
Kightrider.

Knightrider189 · Mar 31, 2025

MART60 said:
No, but I don't see how the Coil that worked great 15 minutes earlier could have gone bad just by replacing the cap, rotor, brush & seal.

I have it set right on TDC now and will go from there.

Thanks,
Kightrider.

Please keep us informed of what you find, MART60.

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MART60 · Apr 1, 2025

Top dead center was pointing toward 8, so just to see, I moved 1 to 8, etc.

Still just cranks.

Thanks, One and All,
Mart

MART60 · Apr 2, 2025

Taking the Coil off the Vette to see what happens.

MART60 · Apr 3, 2025

Put on a Brand New Cap with rotor and everything from the 454/450 I had built in Arizona for the '79 Vette.

The same thing happens.

Cranks Strong/Weak Spark and won't start.

MART60 · Apr 4, 2025

Where is the ignition fuse in relation to where the pink ignition wire plugs in?

Thanks,
Mart

MART60 · Saturday at 1:57 PM

Any Suggestions?

I had stupidly forgotten to unhook the battery,

So maybe it tripped some type of relay switch.

What does the first pic do?

Is the second pic a voltage regulator like the points distributors used?

Thanks One and All.
Mart60

MART60 · Saturday at 2:12 PM

MART60 · Saturday at 2:15 PM

Tank221 · 2025-04-14T07:50:13-0400

What happens when you put ALL the old parts back in and TDC lines up with # 1 on the cap?

You may have partially broken the power wire feed to the coil.

I would make sure you're getting the correct voltage to the coil,

MART60 · 2025-04-14T08:15:10-0400

Thanks Tank.

I put on the brand new unused distributor cap assembly from the unstarted 454 I dropped in the Vette.

I've replaced over 35 parts myself and had the 455 running like a top, now over something so simple, I have to pay.

But it needs its first inspection since 1985, and they'll pick it up on the rollback for free.

MART60 · 2025-04-15T03:07:07-0400

Has Fuel, Air & Spark...

I took a video of the good spark, but
it says file too large to be uploaded.
Thanks One and All.
Mart

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New Dist Cap, Rotor, Bushing - Now No Start 74 T/A?

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