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Improvised oscilloscope probe for Automotive ignition analysis.

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vk6zgo:
My Holden EH's Stromberg carby back in the day, was inadvertently fitted with the main jet from the grey motor.
All worked OK, except that every now & then, the thing would hesitate, & sometimes stall.
I got a carby overhaul kit from the Auto section of my old work, & they asked :- "Do you want the full kit?"

The difference was that kit had a correct replacement jet---- sneaky way of avoiding a recall!
Fitted it, & no more problems.

Holden had a bit of a "glitch" around that time--- someone decided the "grey motor" clutch was adequate for an engine with 30% more power.
Sometimes it was, but mine kept killing clutch plates.(granny-v-revhead?)
I ended up fitting the clutch assembly for the higher power "179cu in" option.

floobydust:
To find vacuum leaks, I use propane. Take a blow torch or BBQ tank (after low pressure regulator) and a long hose, 1/4" tubing with a metal wand and move that around the seams. Enough propane to supply say a candelabra, just a little flow.
You can easily find leaks, the RPM's jump right up. Test it by holding the wand at the carb inlet, letting propane in and see the tach jump up.

maginnovision:

--- Quote from: floobydust on January 14, 2019, 05:43:26 am ---To find vacuum leaks, I use propane. Take a blow torch or BBQ tank (after low pressure regulator) and a long hose, 1/4" tubing with a metal wand and move that around the seams. Enough propane to supply say a candelabra, just a little flow.
You can easily find leaks, the RPM's jump right up. Test it by holding the wand at the carb inlet, letting propane in and see the tach jump up.

--- End quote ---

I've always used carb cleaner, like Gregg. It's usually much more handy for me than propane.

Jim-0000:
Thanks for the good replies.
The carburettor cleaner tip for chasing vacuum leaks is a good one. However, it is not applicable in this case.
We are still waiting for the new plug leads. I expect them one day this week.
There will be no work on the Holden until they arrive and we try them.

Jim-0000:
Just to clarify; the owner and brother are sticking to just changing one thing at a time and then testing it before trying something else. For obvious reasons; they dearly want to know what is the reason for this problem.
Seems logical to me, so I am not arguing.

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