pertronic acting strange lately

[jeanp]

Hi need help again,  My car have a strange isue i saw a few post here that talk about it with no clear solution.

I run pertronics pickup and 3ohm flame trower this worked fine for a few year 5 i think now it run inequal sometime it runs fine

and sometimes at around 4k rpm it dies i lose fire on some of the cilinders and this only apens under load.

I tried using 1.5ohm original coil same thing. tryied to bypass tachometer work for about 30miles than it started

to do same thing, Note the 30 miles i did were on the highway and not to fast lets say around 70mph.

any input would be great.

 

Jean-Philippe

 

Edited June 30, 2017 by jeanp

[jeanp]

I am thinking of my plug wires (they are not very old as per mileage) but they are 6 years old what is the average

lifetime for these.

 

 

[Zed Head]

What does the tachometer needle do when it's "losing fire" or runs unequal?  It's a spark counter.

Can't remember your car.  Are you running carbs or EFI?  Have you tuned it up recently?  Spark plugs get dirty and gap increases as the electrodes wear.  

[jeanp]

The car is su carburators just rebuilt last winter,

Timing and ajusting carbs is done. Plugs are new and gap verified.

I did not notice any weard acting  of the tach needle when this apen

I can tell it does not loose fire on all cylinders probably one or two.

 

 

Edited July 3, 2017 by jeanp

[jeanp]

As per pertronics (they sent me a ground and voltage test sheet) i check resistance between aluminum plate of ignitor and batery ground

they say max .2 ohm i got 0.0 they say test voltage car not running and running. on coil + i got 5.5 not running and 12.0 running (this is on the coil)

before tach on the switch black wire i got  8.0 and 14.0  they say normal would be 14.2 on + of the coil is it normal that i loose 2 volts with the tachometer.

I am wired like the attach drawing.

 

 

Edited July 3, 2017 by jeanp