Crappy idle, misfire on one cylinder.

**427_Rat** · #1 07-20-2018, 02:34 AM

If one lobe on the distributor cam (for #2 cyl.) was wore down, might prevent spark at low RPM and allow a weak spark at higher RPM when points "bounce"...possibly? Just trying to think what would tie it to only #2 cyl. spark. You might check clearance of points on each distributor cam lobe or at least #2 cyl. and a couple others to see if any variation is apparent?

ORIGLS6 · #2 07-20-2018, 03:26 AM

If it's on the Corvette, check your grounding.

**Kurt S** · #3 07-23-2018, 05:29 AM

Quote:

Originally Posted by 427_Rat

If one lobe on the distributor cam (for #2 cyl.) was wore down, might prevent spark at low RPM and allow a weak spark at higher RPM when points "bounce"...possibly?

If it was a bad lobe, I don't know that the distributor machine would have caught that.....

**Steve Shauger** · #4 07-23-2018, 01:45 PM

Quote:

Originally Posted by Kurt S

If it was a bad lobe, I don't know that the distributor machine would have caught that.....

Also when it was being rebuilt it most likely would have been found.

L78steve · #5 07-23-2018, 04:54 PM

Quote:

Originally Posted by Kurt S

If it was a bad lobe, I don't know that the distributor machine would have caught that.....

Yes it would. You look around the whole dial and you can see the spark events of each lobe.
If one lobe is worn it would show a late spark on that lobe.

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