Misfiring while cruising

[jalexquijano]

46 minutes ago, Mark Maras said:

 @jalexquijano

We can't eliminate poor wires or connections until you complete the tests on all six. Three separate tests that includes testing with everything (cap and plugs) connected Then another test on all six with the cap disconnected, plugs connected, then a third test on all six with the plugs disconnected and the cap connected. It would be a good idea to do a fourth test on the wires only. No cap or plugs connected. I still think you'll find the problem somewhere in the cap (new), rotor (new), wires, or the wire connections. I think the carbs are close enough based on some plugs looking good. You've checked for intake leaks and found none. Compression ratio is OK. There's really only a couple of things left. Valve seals are a possibility (seals could have been damaged due to improper installation) but lets eliminate the easy one first. Try not to get too frustrated. WE will figure this out.

The resistance test i did yesterday was with the distributor cap disconected one multimeter probe at the cap terminal and the other one at the center electrode of the spark plug lugged at the spark wire boot. What else is needed? 

[Zed Head]

19 hours ago, jalexquijano said:

6.89 k spark plug 5

7.17k spark plug 4

5.83k spark plug 3

1, 2, and 6 are missing.

[siteunseen]

Some more "complaining" and "bashing".  How did he get here from "Misfiring while cruising" by letting the car idle idle for 20 minutes?  I like Marks comment on kicking the shins.   Very entertaining post to me so thanks jalex, please continue.

The guy that started the thread fixed his problem on page 1.  Now it's on page 6. 

 

 

 

 

[jalexquijano]

Well just tonlet you know my pertronix ignition module 1761 bought in amazon is new. Do you think i should buy another pertronix coil?

[Mark Maras]

 No. The fact that some of the plugs look good means that the coil is working fine. The problem appears to be in the distribution of the spark to all the plugs. That's why a distributor is called a distributor. The distribution of spark is handled by the the spinning rotor receiving high voltage from the coil then it distributes the spark to the contacts inside the cap into the spark plug wires. There are four connections on each wire that can give you trouble The connector that plugs into the cap. The connection of the wire to the previously mentioned connector, then we move down to the plug end. There's the wire to the connector and the connector to the plug. Any of those connections can cause a fouled plug. The test that I described earlier is to try to isolate which connections are bad. Grab a cold beer or two, your multi-meter, enough time to do it properly and have a go at it.

[jalexquijano]

This is the set of NGK wires my car currently carries:

https://www.amazon.com/dp/B001O7F83C?tag=zcarconvert-20

Any better options or will this suffice?

[Mark Maras]

Measure the resistance in all of them. We'll start there. There are numerous videos on YouTube to show you how.

[Zed Head]

This is an unusual problem.  Might take a while to figure out.  The solution might not be simple.

[jalexquijano]

Cyl 6, spark plug 6 = 7.18k

Cyl 5, spark plug 5 = 6.88k

Cyl 4, spark plug 4 = 7.15k

Cyl 3, spark plug 3 = 5.82k

Cyl 2, spark plug 2 = 5.73 k

Cyl 1, spark plug 1 = 5.72 k

Test measure the same from end to end of each spark wire.

What else??? 

[jalexquijano]

3 hours ago, Mark Maras said:

Measure the resistance in all of them. We'll start there. There are numerous videos on YouTube to show you how.

Already posted the results. Want me to retard the timing fron 14 tdc to 12?

[Mark Maras]

 Ok, good. Now connect the wires to the distributor cap and measure the resistance from the contact inside the cap to the spark plug connector. see if the readings change.

[jalexquijano]

20 minutes ago, Mark Maras said:

 Ok, good. Now connect the wires to the distributor cap and measure the resistance from the contact inside the cap to the spark plug connector. see if the readings change.

Reading was the same. It did not change. Should i take my car for a spin hard and retard the timing from 14 to 12 btdc to see if leaving it at idle does the same?