Engine question…

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AGPlant

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Hard to describe, but what could be causing a jerking sensation when driving, eg every second? Not so noticeable when accelerating, but say if cruising with slight accelerator it’s a general jerking in time to the engine? All clearances set, new points and condenser and plugs and all tuned.
 

Coda

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Sounds like you're describing a misfire. All your HT cables OK and firmly connected?
 

AGPlant

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HT cables are fine. Has had new points and condenser and setup ok. I got an old Bosch one from Stanford Hall that needs a general clean up. Only difference is hole in side for the connector is square rather than semi circular.

It’s weird as doesn’t feel like a misfire, just gently nods your heads backwards and forwards like a chicken! 😂
 

JohnVW

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My mate had a similar issue in his 2cv and he fixed it by putting in a slightly larger main jet in the carb.
 

purpledog07

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Hi plant, some more info would help.
What vehicle and what engine is fitted?
Was it all good before you changed these parts and tuned up?
Did you time the spark dynamically or static?
What carb are you running?
Which bosch dizzy is fitted? there are numbers stamped on the side.
Is the dizzy a like for like swap?
Did you swap the rotor arm?
Is the dizzy vacuum pipe connected?
 

NigelDenham

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If it was ok before the replacement parts were fitted I’d check for any obvious fitting errors then try backtracking, putting the old parts back on one thing at a time. Just because it’s new doesn’t always mean it works.
 
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