A15 cutting out, feels like ignition

[rbastedo]

A15 motor, A14 head with dual HIF4 (SU) carbs.

Was running great until recently the thing just started cutting out randomly especially when cold.

I take off from home and it will do this thing where it feels like it's losing ignition for an instant, sometimes repeatedly so it's running on-off-on-off.

The tach swings wildly when ti's doing this.

Then it starts running ok, not 100% but ok.

 

It's spring now so time to change out plugs, cap & rotor - maybe that will either fix it or I'll find something else while doing that.

It has electronic ignition so no points to play with.

Any other ideas?

[Pumpkn210]

Mine was doing the shame shing cause of a loose wire on the coil.

[rbastedo]

Yes, one of the first things I checked.

I could have a loose wire to the tach though, I was under the dash changing things around a few days ago.

I will take a look tonight.

[Pumpkn210]

Ifn I was you, I would go to a matchbox dizzy. The swap is super easy and is a HUGE improvement over the points setup!

 

Do you have a datsun, or is it in an MG?

[rbastedo]

that was weird

[rbastedo]

It has electronic ignition so no points to play with.

 

Motor and 5 speed dogleg in a Midget.

Peppy when it's running right. :lol:

 

What's this dizzy you mention and where do I get more info?

[Pumpkn210]

Thought you said that you were going to replace the points? :unsure:

 

The matchbox dizzy is the stock datsun electronic ign setup, they look like they have a black matchbox on the side of the dizzy!

[datzenmike]

[rbastedo]

Yes, I have the electronic dizzy.

 

It was a lot better this morning, replaced cap & rotor & plugs but the cutting out is still there, just a lot less.

Will thoroughly check wires to coil, ignition and tach today after work.

[rbastedo]

Felt sick yesterday so didn't get to it until today.

 

I had previously moved the coil over to the passenger side of the car since that is where the diz and the plugs are.

The wire I used wasn't the best, I replaced that today.

Completed replacing the old glass fuse block with two newer style blade fuse blocks.

Mounted relays with self tapping screws instead of leaving them to dangle by the wiring.

Basically cleaned up some stuff.

Driving ok now, but it's generally early morning that is the problem time so I'll hold judgment until after tomorrow morning.

[rbastedo]

Dang, still doing it some this morning.

Going uphill it feels more like bad missing now and not all the time.

I'm going to get a new set of plug wires this afternoon and toss them on and see what happens.

[rbastedo]

Plug wires did the trick.

Sometimes it is the easy stuff, but I'm glad I've done all the other stuff too.

Now I have 6 fuses for my switched power that is fed from a relay and I have 6 fuses for the things that always have power.

I had to add one inline fuse for the things that get power through a switch on the dash so now I've got 13 fused circuits replacing the 3 that it had when I bought it.

I'm still without dash lights, but I can solve that little issue pretty easily now.