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Improvised oscilloscope probe for Automotive ignition analysis.

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maginnovision:
Two 'career mechanics' should not need so long to figure something like this out. Especially when you consider the symptoms stayed when the ignition components were swapped. I'd recommend taking it elsewhere no matter what the actual issue ends up being.

Jim-0000:

--- Quote from: maginnovision on January 08, 2019, 11:25:09 pm ---Two 'career mechanics' should not need so long to figure something like this out. ...
--- End quote ---
I could not agree more!

--- Quote ---Especially when you consider the symptoms stayed when the ignition components were swapped. .....
--- End quote ---
Also, the missfire was there with the first (or original) engine in the car when it was first acquired. So, much more than ignition components have been swapped. I might have already mentioned this, but the triple 11/2 SU carbs were swapped for a single (forgot the brand) carb and a new manifold fabricated out of two, all in an attempt to fix this miss fire.
The engine was swapped as this one was being modified extensively for performance and the original one was being used meanwhile.


--- Quote ---I'd recommend taking it elsewhere no matter what the actual issue ends up being.

--- End quote ---

You have lost me here. If the "actual issue" is found, there will be no need to take it "elsewhere"?

Jim-0000:

--- Quote from: Edison on January 08, 2019, 10:52:28 pm ---...............................
Minus control - battery / chassis - chassis / engine.................
--- End quote ---

The ignition system has been jumpered wtih a separate battery and jumper leads, all independent from the cars wiring. Same result.

--- Quote ---Is the injection system fully electronic?..............
--- End quote ---
No injection system. Please read other posts - naturally aspirated. Two carb systems tried. Same result.


--- Quote ---Do you have? speed sensor, engine vibration sensor, air weight, lambda .....
Is the carburettor or ecotronic system?...........No. All analogue. Old world systems. 1950 vintage motor.


--- Quote ---Hall probe in distributor, burned distributor cap,  reading in chambers (diaphragms, hoses, pressure sensors) jets, float, leaky chambers ........

--- End quote ---

Both hall sensor triggered ignitor system and kettering (points and capacitor) system tried. Symptoms worst using electronic ignition alternative.
At least two new distributor caps tried.
Thanks,

Jim.
--- End quote ---

maginnovision:

--- Quote from: Jim-0000 on January 09, 2019, 03:18:33 am ---
--- Quote from: maginnovision on January 08, 2019, 11:25:09 pm ---Two 'career mechanics' should not need so long to figure something like this out. ...
--- End quote ---
I could not agree more!

--- Quote ---Especially when you consider the symptoms stayed when the ignition components were swapped. .....
--- End quote ---
Also, the missfire was there with the first (or original) engine in the car when it was first acquired. So, much more than ignition components have been swapped. I might have already mentioned this, but the triple 11/2 SU carbs were swapped for a single (forgot the brand) carb and a new manifold fabricated out of two, all in an attempt to fix this miss fire.
The engine was swapped as this one was being modified extensively for performance and the original one was being used meanwhile.


--- Quote ---I'd recommend taking it elsewhere no matter what the actual issue ends up being.

--- End quote ---

You have lost me here. If the "actual issue" is found, there will be no need to take it "elsewhere"?

--- End quote ---

What I mean by the last bit is that even if the actual issue(misfire is a symptom) has/had anything to do with the ignition system it still would be/would've been the right thing to take it elsewhere. Unless of course you don't mind the time lost and the work is very cheap.

Jim-0000:

--- Quote ---What I mean by the last bit is that even if the actual issue(misfire is a symptom) has/had anything to do with the ignition system it still would be/would've been the right thing to take it elsewhere. Unless of course you don't mind the time lost and the work is very cheap.

--- End quote ---

I would not have a clue where "elsewhere" would be to take it, even it if was mine!

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