Misfiring while cruising

[wil84911]

Thanks Mike. Might look into 123. Captain, yes bursts of split second cutting outs. Light sanding to rid of dirt works. Anyway it is temporary. Thanks


12/70 2.6 block E88 heads Mallory DCOE40 3/2 Twice pipes Tokico 1, 3/4 in sways, ext oil cooler

[Captain Obvious]

Bursts of complete cutting out does sound like an electrical issue, but it sounds like something on the primary side of the coil and not something on the high voltage side. Of course, I reserve the right to be completely off base, but I'd concentrate your efforts on the primary side. Especially if there have been known issues with the Mallory module.

Good luck with the investigation. Is there an old-school points distributor you can throw in there to see what happens?

Another idea would be to carry a can of freeze spray and hit the module with a quick blast next time the problem occurs.

[wil84911]

Captain, thanks. So far today only one quick cutoff otherwise drove okay.

 

 

 

12/70 2.6 block E88 heads Mallory DCOE40 3/2 Twice pipes Tokico 1, 3/4 in sways, ext oil cooler

 

[Captain Obvious]

My pleasure. And if you find yourself down this way, get in touch and we'll see if we can pinpoint the exact problem together.

And... Don't get lulled into a sense of confidence about the problem that only occurred once in a certain day. These sort of things typically only get worse over time, and one day it's likely to cut out and not come back. And at that time you will be in the most inconvenient situation and location.

Better to have a handle on the problem on your schedule.  

[wil84911]

Here’s a video. Happened again today. Note: tach is inaccurate.

 

 

 

 

 

12/70 2.6 block E88 heads Mallory DCOE40 3/2 Twice pipes Tokico 1, 3/4 in sways, ext oil cooler

 

[rcb280z]

I don't see a video link

[Captain Obvious]

Yeah, I don't see a video either. Something went wrong there.

But your comment about the tach brings up an important piece of info...  The early version of the tach ran the ignition primary side through the tach, and because of this, if there are problems on the primary side of the ignition, it often affects the tach operation.

So the question is... What does your tach do when your engine cuts out? Does it drop to zero? (That question is probably answered by your video?)

[wil84911]

Sorry hopefully fixed.


12/70 2.6 block E88 heads Mallory DCOE40 3/2 Twice pipes Tokico 1, 3/4 in sways, ext oil cooler

[Captain Obvious]

Yeah, with the tach dropping off like that, it's probable there is something wrong on the primary side of the ignition system. And with the input from the other guys, it sounds like the ignition module is suspect.

 

[Zed Head]

Best be ready - https://www.summitracing.com/parts/maa-605

And don't forget to check the ground circuit.  Often overlooked.  All of the coil's primary circuit current passes through the module, to ground.  A dirty/loose connection can cause extra heat, in a part that already runs hot.  Ignition modules hate heat.

You might just take the module out, clean up all of the connections and reinstall it.

[wil84911]

Thank you guys!


12/70 2.6 block E88 heads Mallory DCOE40 3/2 Twice pipes Tokico 1, 3/4 in sways, ext oil cooler

[wil84911]

Yeah, with the tach dropping off like that, it's probable there is something wrong on the primary side of the ignition system. And with the input from the other guys, it sounds like the ignition module is suspect.
 

Yes a new ignition module fixed the problem. Drove the car to a Z meet an hour away and it ran like a clock. Waiting for other parts to complete the tune up though. Thanks again to all.


12/70 2.6 block E88 heads Mallory DCOE40 3/2 Twice pipes Tokico 1, 3/4 in sways, ext oil cooler