Help!! Engine Miss

Alan Roehrich · 01-24-2012, 02:41 PM

Ben, can the miss be isolated to one or two cylinders, or is it just a miss that moves from cylinder to cylinder?

With a completely different ignition system and carburetor having been tried, if I read correctly, you're starting to move toward a mechanical problem, as much as that is something you do not want to hear. I'd do a compression test, check the lash, check the lobe lift, hook an undampened vacuum gauge to a manifold vacuum source, and check the valve springs.

You might try a fresh set of slightly (1-2 steps) hotter plugs, with a gap in the 0.026" range.

Have you hooked a volt meter to the various 12 volt positive inputs to the ignition system? You might look for a voltage drop when the miss is happening.

01-24-2012, 02:41 PM	#19
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,136 Likes: 1,616 Liked 1,924 Times in 432 Posts	Re: Help!! Engine Miss Ben, can the miss be isolated to one or two cylinders, or is it just a miss that moves from cylinder to cylinder? With a completely different ignition system and carburetor having been tried, if I read correctly, you're starting to move toward a mechanical problem, as much as that is something you do not want to hear. I'd do a compression test, check the lash, check the lobe lift, hook an undampened vacuum gauge to a manifold vacuum source, and check the valve springs. You might try a fresh set of slightly (1-2 steps) hotter plugs, with a gap in the 0.026" range. Have you hooked a volt meter to the various 12 volt positive inputs to the ignition system? You might look for a voltage drop when the miss is happening. __________________ Alan Roehrich 212A G/S