Slant 6 ignition

[clementine]

Also did this all happen after the points change?

Hello Dr Hoppy,
The symptoms of the #6 and #1 plug wires not showing up on the timing gun flash was happening before the points change. I was a little scientific in that I did one change at a time and started car in between changes.

car runs like shite........took out and tried to "clear it out"

clean plugs........a slight but noticeable change in the right direction (if I even remember correctly)

still running like shite.......change points and condensor but use matchbook to gap points (possible error)

At this point it seems like I have added a "no spark in the wire" condition on #1 (not just #6) that has now persisted. (#6 will fire intermittently with an RPM increase)

Change cap n rotor..........Shite

Final result as of walking away yesterday eve is ........#6 and #2 are intermittent spark with RPM, and no spark at idle. #1 cylinder no spark condition all the time.

Thanks to you all for the time and knowledge you have given me.

 

[clementine]

id do the following
might not help but doesn't cost nuffin

clean the ceramic part of each plug in brake cleaner or even dish soap and water
squeaky clean.. if the electricity can track across the ceramic in the dirt you get no spark

clean out the connectors on the ends on the wires in a similar way. dirt in the rubber boot can do the same thing.. well it can in damp wet places like where i'm from

make sure the screw on parts on the plug tops are tight if they need to stay in place for your leads.

try a spare or different set of leads...


if that doesn't help this does cost a bit

i have one of these (sadly sold out on your local website, but decent info)

Gunson Colortune See Through Spark Plug Kit G4074 G4171 G4172

its a see-thru spark plug with a little telescope and mirror so you can see the colour of the flame in the chamber..

dismissed by many as a waste of time. but hey there is no convincing some

Thanks Dave,
I have one of those inline deals that Ill see if I can visualize the spark.

I think a plug check might also help

 

[clementine]

No play in rotor.

 

[clementine]

Cap. Almost a 1/4”….. probably in the 3-16” side. They all have a tiny bit of carbon streak across the face. Arguably #1 and #6 MIGHT be a bit cleaner. Again, a new cap ran for 5 min +/-

Batt seems low.

 

[slantsixdan]

stay away from the distributor caps with the narrow inside terminals > they are trouble.

Width of the cap terminals isn't the thing to watch out for. Extensive Slant-6 cap and rotor info is in this long (but worthwhile) thread.

 

[Bewy]

Swap some plug leads & see if the problem moves with the leads.

 

[clementine]

Swap some plug leads & see if the problem moves with the leads.

I did swap the #5 wire to the previously not firing #6...........#5 still fires and #6 exudes the same symptoms.

Are there any grounds that I need to be aware of in this scenario? It is just the spark plug itself no? (grammer?)

 

[clementine]

Circling back here.

As expected 1, 2, and 6 plugs are black.

3, 4, and 5 look like they are a bit cool

Plug order is 1-6 right to left

I have new plugs n wires which I’ll install.

Check lash.

 

[clementine]

Check compression while plugs are out?

 

[clementine]

6 new plugs and new wires and she fired right up and is running good. Still doesn't fix my problem though. It was running good before and I don't believe the hardware I took out was that old.

So why do 1, 2, and 6 look pig rich?

3, 4, and 5 only have grey halfway down strap.

You would think the interior plugs would be richer than the long runner outsides ya?

My compression checker is MIA.

I will clean up some grounds especially on the headlight circuit. I have a spare one of those relay harness' made by crackedback that will help. The headlights are real dim.

This car will be going up for sale pretty soon to support my pre war project I picked up. I'd like to get it going as good as I can.

Thanks FABO!!

Lots of reading from SSD to do!!

 

[65 Cuda 340]

Need hotter plugs?

 

[Bewy]

Nope, not hotter plugs. There are '4' s in there now, which are already a hot plug. The fluffy black spark plug electrodes suggest a very rich mixture, such as the choke partially closed.

 

[Newbomb Turk]

Circling back here.

As expected 1, 2, and 6 plugs are black.

3, 4, and 5 look like they are a bit cool

Plug order is 1-6 right to left

I have new plugs n wires which I’ll install.

Check lash.

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View attachment 1716385174

View attachment 1716385175

You are faulting the ignition when the carb is so pig fat Rick it’s no wonder it’s dropping holes.

Get some fuel out of it go from there. You are way too rich and it’s not even close.