 #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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| yellow75 |
Oct 20 2016, 06:13 PM
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#2
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Member Group: Members Posts: 88 Joined: 1-October 16 From: pittsburgh Member No.: 20,452 Region Association: None |
sooty black. dry as a bone. Sorry I cleaned it a put it back in. Ordered new plug wires and a set of NGK RBP5ES plugs.
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| yeahmag |
Oct 21 2016, 09:47 AM
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#3
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Advanced Member Group: Members Posts: 2,422 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California 
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OK. So at this point you can decide to do a compression check (which I would recommend) or just work on the carb. For the carb, start by verifying everything in the idle circuit (idle jet is the correct size, properly seated, and the volume screw isn't too far off). You should also make sure you don't see any drips of fuel from that barrel when the car is running (or even stopped if it's bad).
Doesn't hurt to make sure all the basics are done too... Ignition working (see above) and valves adjusted properly. QUOTE(yellow75 @ Oct 20 2016, 05:13 PM)  sooty black. dry as a bone. Sorry I cleaned it a put it back in. Ordered new plug wires and a set of NGK RBP5ES plugs. |
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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
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, 06:01 AM 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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