#3 plug is black... |
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#3 plug is black... |
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 |
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. 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. |
yellow75 |
Oct 21 2016, 02:48 PM
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#4
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Member Group: Members Posts: 88 Joined: 1-October 16 From: pittsburgh Member No.: 20,452 Region Association: None |
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. 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. What are the proper idle jet sizes? These are 40 IDF's |
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