720World

Little Trucks, Big World

So....I tested all of the leads on one of my trucks...here are some numbers.

Intake

1-5.69

2-5.11

3-7.65

4-7.46

Exhaust

1-2.77

2-4.48

3-4.12

4-5.97

Tested the exhaust side leads on another truck, had (just) slightly higher results. The truck runs good.

My FSM says....

........"Resistance readings greater than 30,000 ohms....replace"

 

An eHow Automotive site suggests....

 

..."Your readings may jump around at first but should stabilize after a few moments. A shorter wire with a length of 12 inches may test out between 6.00 to 7.00 ohms and a longer wire of 30 inches may measure out between 9.00 and 11.00. A 24-inch wire may come in between 7.50 and 9.00 ohms. All of the above readings would put you in a normal range.

   

 Any reading less than 6.00, regardless of the length, would represent low resistance, and that wire would be best off replaced.

 

Your readings may jump around at first but should stabilize after a few moments. A shorter wire with a length of 12 inches may test out between 6.00 to 7.00 ohms and a longer wire of 30 inches may measure out between 9.00 and 11.00. A 24-inch wire may come in between 7.50 and 9.00 ohms. All of the above readings would put you in a normal range. Any reading less than 6.00, regardless of the length, would represent low resistance, and that wire would be best off replaced....."

 

 

My multimeter was set at 20k....same as the test stated above.

There seems to be a contradiction here?

Am I missing something?

Well....if anyone has a mulitmeter, a set of new high tension leads lying around.....and nothing better to do.....:)

lol

Views: 298

Reply to This

Replies to This Discussion

In a nutshell the FSM is looking for low resistance.....?
Whereas the site I mentioned above is talking about a higher resistance.
i had an FSM for an 86 720... i used it to light a bonfire because its junk.. just like the chiltons and haynes books for them...screw nissan and their rotten bastard cars
.....i had an FSM for an 86 720... i used it to light a bonfire because its junk...
Hmmmmm...20 dolla......ebay.......lol
I did find out that low resistance will give you a better spark....but will not increase HP and or.
Relative to a finely tuned/running engine with stock 'configurations'.
My lowest reading was 2.77 (multimeter set at 20k).....so....do I times(x) that by 20000?
Which will give a reading of 55,400.......still to large by the FSM (30,000)standards.
High....Low.....?
WTF
Confusion.....:)
My FSM says all cables less than 30,000 ohms, over that.. replace.

If your multi is set to 20,000 ohm resistance scale, a full scale reading is 20,000 ohms. Half that... 10,000 ohms and so on. Digital or analogue?
Mike it's digital.
Yes Steve... the truck is running 'funny'.....somewhat.
Either a rich mixture and or insufficient spark.
So.....I figured if anyone one had a 'new' HT lead lying around....that might end my query....lol
Actually I'm emailing NGK.com....as we speak.....to get some specs.
Crazy...?...possibly....:)
BTW...
My wires are NGK.
I also realize that resistance will increase with lead length.....thus the higher numbers, farthest plug from dizzy.
Just need (2) a baseline reading(s) from the longest and shortest leads you have....newer NGK and or...anything is 'good'.
is your truck running funny? or are you crazy?
6 of 1 but not 7 of 9
Well at 2.77 on a 20k setting with only a 5 digit LED readout on the MM.
That could possibly mean 7 of 8.........lol
Should get a response from the company...... on their plug wires.
Nice to know when your NGKs are NFG.
:)
Just got an email back from NGK.....interesting.
The FSM and the site (ehow) I provided are wrong.
Wonder how many wire sets were tossed due to incorrect data?

Intake
1- 4.5 - 7.7kΩ
2- 4.4 - 7.4kΩ
3- 5.6 - 9.5kΩ
4- 5.6 - 9.5kΩ
Coil lead- 2.6 - 4.4kΩ

Exhaust
1- 2.2 - 3.7kΩ
2- 3.5 - 6.1kΩ
3- 3.3 - 5.6kΩ
4- 4.6 - 7.9kΩ
Coil lead- 2.6 - 4.4kΩ

RSS

© 2020   Created by TigerRacing.   Powered by

Badges  |  Report an Issue  |  Privacy Policy  |  Terms of Service