Missing at high revs under load

Herzeg · Post by **Herzeg** » Wed Nov 08, 2017 9:20 am

Mike

Angus got my dizzy rebuilt and got the Pertronix kit plus coil from him as well. So it should have worked properly. Don't know about the spark plugs, I'll have to look at that.

John

AnD3rew · Post by **AnD3rew** » Sat Nov 11, 2017 2:21 am

This is turning out to be very frustrating, everything I do seems to make a difference immediately and then the problems come back again. Have replaced the fuel and air filters. Plugs, leads, and coil. It is definitely more drivable now as it had deteriorsted to the point that it was pretty much missing all the time. Now it’s pretty good under load but there is a miss at cruise and it some rev ranges. The tacho sits pretty smoothly even when it is missing.

I think I am at the end of my ability, it’s going to the mechanic

abowie · Post by **abowie** » Sat Nov 11, 2017 3:01 am

Are you using the reproduction Champion plug caps? These fail in exactly the way you describe.

AnD3rew · Post by **AnD3rew** » Sat Nov 11, 2017 8:11 am

abowie wrote:Are you using the reproduction Champion plug caps? These fail in exactly the way you describe.

No, standard style and brand new leads.

malcolm · Post by **malcolm** » Sat Nov 11, 2017 9:31 am

copper leads or silicone?

AnD3rew · Post by **AnD3rew** » Sat Nov 11, 2017 10:46 am

Silicone

AnD3rew · Post by **AnD3rew** » Sat Dec 02, 2017 9:41 pm

Thanks all, Murphy’s law applies, it’s always the last thing you get to. It was the distributor cap.

Purring like a kitten again.

Tbob · Post by **Tbob** » Sun Dec 03, 2017 3:23 pm

AnD3rew wrote: It was the distributor cap.

Interesting.i had a repro dizzy cap that the spring-loaded center button broke cleanly off, right at the plastic. The car still ran, but had a random miss. Took me a bit of time to find, because the cap was only a couple of weeks old.

AnD3rew · Post by **AnD3rew** » Sun Dec 03, 2017 8:57 pm

That is interesting, because when you looked closely at mine it looked like the rotor had become misaligned in some way and had scored the inside of the cap.

Herzeg · Post by **Herzeg** » Mon Dec 04, 2017 4:21 pm

Mine wasn't cured first time but...

After replacing the Pertronix with points, the high speed was cured but low speed became terrible. Found the timing was out and was sorted. It now runs fine. Just goes to show the old ways are sometimes the best.

Now move on to the next problem

John

AnD3rew · Post by **AnD3rew** » Mon Dec 04, 2017 10:32 pm

Now the distributor cap is fixed and it has new plugs, leads, distributor cap and rotor, and coil it is running beautifully, a little lumpy at idle but I can live with that. But The Pertronix doesnt seem to be causing the problems. I now have strong clean smooth power all through the rev range.

abowie · Post by **abowie** » Mon Dec 04, 2017 10:37 pm

I think that the lumpy idle is pretty much par for the course with the 4.2.
The cars are nice when they're running well though.

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Missing at high revs under load

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