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Old 10-18-2010, 06:04 PM  
Junior Member

Frisco, Texas
Join Date: Oct 2010
Posts: 9 | Kudos: +10
4.2 liter smoking

Fresh build engine that smokes after it starts to warm up. It fowls #4 or #5 plug also.

This engine is a true AMC (all motors combined)

GM HEI distributor
Ford Motorcraft 351 cfm carburetor
Crane RV cam

Our suspicion is a glazed cylinder as some guys doing the wires let it idle for a long time before it has been "worked".

There was a fair amount of cross-talk etching on the rotor, I suspect this was due to the fouled plug(s).

Thanks,

Hitch
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Old 11-07-2010, 04:00 PM  
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Denison, TX
Join Date: Nov 2010
Posts: 21 | Kudos: +10
Got the ignition straightened out yet?
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Old 11-09-2010, 09:46 PM  
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Dallas, Texas
Join Date: Nov 2010
Posts: 2 | Kudos: +10
What color is the smoke? Who did the build?
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Old 01-02-2011, 10:22 AM  
Junior Member

Frisco, Texas
Join Date: Oct 2010
Posts: 9 | Kudos: +10
long absence, sorry.

smoke is white, add to the mess now fuel is spitting back at the carb.

I will:
  1. rebuild carb
  2. leak-down test all cylinders
  3. yell and scream

Plano Machine did the long block, I doubt they screwed up
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Old 01-06-2011, 10:21 PM  
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Dallas, Texas
Join Date: Jan 2011
Posts: 9 | Kudos: +10
White smoke may be steam from a water leak, like a head gasket or intake gasket. A cylinder trying to burn water would certainly foul the plug, so I would think the problem plug location, would be the place to look for leaks. If the leak is small, it may take pressure in the cooling system (after warmup) before the condition shows.
Also....if you have moisture in the fuel, you can see this...the white smoke and the fouled plugs. Might want to check...especially if the vehicle has sat for awhile. (if the vehicle has an electric fuel pump, tap a fuel port or remove a line and cycle the pump to drain some fuel into a container to check for water)

anyways, couple of thoughts.
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Old 01-16-2011, 08:59 AM  
Junior Member

Frisco, Texas
Join Date: Oct 2010
Posts: 9 | Kudos: +10
Thanks. All good ideas. I will be able to work on it in a month or 6 weeks. There is so much left to do on the truck to finish it.

Are there support groups for gearheads?

Hitch
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Old 01-21-2011, 10:33 AM  
Junior Member

Euless, Texas
Join Date: Jan 2011
Posts: 5 | Kudos: +10
If it was water in the fuel, it would be all cylinders, not just #4 or #5. If it's blue smoke, I might suggest that it's oil burning from a ring that hasn't quite seated yet. With it waiting until the engine is warm makes me more likely to think that.

OK a couple of questions. How long ago was the engine rebuilt? Was the engine honed at all, and if it was, how well of a hone job was it?
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