 #3 plug is black... |
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| yellow75 |
 Oct 20 2016, 03:59 PM
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#1
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Member  Group: Members Posts: 88 Joined: 1-October 16 From: pittsburgh Member No.: 20,452 Region Association: None  |
pulled the plugs on my new to me 75 1.8 with carbs today. 1,2,&4 look good grey in the center (3 electrode plugs) black around the sides. # 3 was totally black. it was idling rough so I pulled one plug wire at a time to see the difference it made. All but #3 made a difference. When I pulled #3 there was no difference at all. It has an electronic fired dizzy in it as well. Cap and rotor are new. What ya think?
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| zach914v8 |
Oct 21 2016, 06:01 AM
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#2
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Member Group: Members Posts: 216 Joined: 26-November 10 From: Houston Member No.: 12,426 Region Association: Southwest Region |
A quick and simple test to see if your plug wires are bad is get a water spray bottle and mist the wires gently, no need to go over board. If you have a bad wire blowing fire, you'll find it quick.
If misting doesnt tell you anything, install a spark checker on both a know good cylinder wire and the bad one. Look at the difference. A good ignition system should blow big blue 20kv spark. Just hook the end of the wire from the spark plug to the tester. That clamp on the tester, ground it to the engine.  The spark tester gap is ajustable, 20kv is like a 20mm gap. |
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Posts in this topic
yellow75 #3 plug is black... Oct 20 2016, 03:59 PM
yeahmag Was it oily and black or sooty and black? Got a pi... Oct 20 2016, 05:17 PM plays with cars Could be a bad plug wire. If you have an ohm mete... Oct 20 2016, 05:54 PM yellow75 sooty black. dry as a bone. Sorry I cleaned it a p... Oct 20 2016, 06:13 PM
yeahmag OK. So at this point you can decide to do a compre... Oct 21 2016, 09:47 AM yellow75
OK. So at this point you can decide to do a compr... Oct 21 2016, 02:48 PM zach914v8
A quick and simple test to see if your plug wires... Oct 21 2016, 06:34 AM Vacca Rabite
The spark tester gap is ajustable, 20kv is li... Oct 21 2016, 09:10 AM zach914v8
The spark tester gap is ajustable, 20kv is l... Oct 21 2016, 09:27 AM pbanders
A quick and simple test to see if your plug wires... Oct 21 2016, 12:11 PM yellow75 Yeah I will do a compression check this weekend al... Oct 21 2016, 02:44 PM yeahmag I'm a Dellorto guy, but I seem to remember 55-... Oct 21 2016, 05:06 PM yellow75 I will do that. Thanks. Oct 22 2016, 08:22 AM |
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