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Author Topic: Black soot on plug 4, oil on 1 and 2, 3 looks fine  (Read 1136 times)
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aldad138
Alexander M K Kasner
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1979 Beta Coupe


« on: June 26, 2016, 10:36:11 PM »

NGK plugs, look old but not decrepit.  Only one of the 4 looks good.  I cleaned them, cleaned the area, and reinstalled.  The idle is smoother, the sputter in 1st and 2nd is better, but still obvious.

I have only put about 20 miles on this rig, so "damage" was done before I took her.  What should my first step be?

Alex
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1979 Lancia Beta Coupe
1994 Nissan Hardbody
2014 Mazda 3
Old Cars
1977 Alfa Romeo Alfetta
1990 Subaru Legacy
1979 Fiat Strada
1998 Volvo V70 GLT
Neil-yaj396
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1979 1300 Coupe 1983 2000ie Coupe


« Reply #1 on: June 27, 2016, 07:00:18 AM »

Failing head gasket?
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WestonE
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« Reply #2 on: June 27, 2016, 08:10:25 AM »

Do a compression test engine hot throttle wide open coil disconnected. You want to see strong figures and even figures across the cylinders

Eric

I would buy new plugs
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peteracs
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« Reply #3 on: June 27, 2016, 08:32:51 AM »


I would buy new plugs

I am with Eric, no sense in keeping the old plugs.

Peter
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Beta Spyder S2 pre F/L 1600
Saab 9-3 1.9Tid Cabrio
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« Reply #4 on: June 27, 2016, 02:23:52 PM »

Alex,

I agree with running a compression test, along with changing the plugs.  I'd check the cap and rotor for carbon tracking and check the points to see if they're not burnt.

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Mike R.

1968 Mercury Cougar XR7
1961 MG Midget
1974 Ford Mustang II Ghia
1977 Lancia Beta HPE
aldad138
Alexander M K Kasner
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1979 Beta Coupe


« Reply #5 on: June 27, 2016, 03:24:53 PM »

I am buying new plugs today, and will run a compression test with my buddy this week.  It is running a pointless distributor, so that is not a problem.  There is sufficient oil around the head that I may need to change the valve cover and head gaskets soon.

Alex
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1979 Lancia Beta Coupe
1994 Nissan Hardbody
2014 Mazda 3
Old Cars
1977 Alfa Romeo Alfetta
1990 Subaru Legacy
1979 Fiat Strada
1998 Volvo V70 GLT
HFStuart
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« Reply #6 on: June 27, 2016, 07:13:59 PM »

I don't think I'd rule anything out at this stage. You may suspect the dizzy is ok but you don't know that until you've eliminated it. Compression test definitely the place to start though.
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