Smoking CJ7 -
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post #1 of 3 Old 03-08-2009, 04:06 PM Thread Starter
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Smoking CJ7

I have a few questions. I bought a CJ7 that was supposed to have had a rebuilt engine. Inline 6 cylinder. The previous owner said nothing was done to the head. It had a small 2 barrel carb on it, but, not stock. It smoked pretty bad, but, it appeared to be running rich. I replaced the carb with a new weber 36 DGEC. I also did the nutter bypass on it. I don't think there is any wiring hooked up, except the bare minimum. No computer hooked up at all. All vacuum disconnected and plugged, except the bare minimum. Set timing to spec, Idle set to spec.
It idles good, takes gas good, does not diesel on cutoff. you can see a slight amount of smoke at idle, but, it is like a fogger when you take off. After you get up to speed, the exhaust looks like it does at idle. The smoke appears to be white in color. I have not done any adjustment from factory settings as per instructions. I installed new plugs, and new valve guides also. I have not pulled the plugs yet to see what they look like. Still hot.
So what do you think? Does it sound like it is running rich from fuel, or does it sound like oil? Maybe water!
Tell me what you think, please, I apprecited it.

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post #2 of 3 Old 03-08-2009, 06:38 PM
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2011 JK Wrangler 
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Location: Pinehurst, NC
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My L-6 ran rich most of the time, and it was black smoke.

Blue smoke indicates burning oil, and it usually would get better as the motor warms up.

The white smoke sounds like you have a leaking head gasket, and you are seeing water being burned off.

Pull your plugs, white residue would be antifreeze and and indication of a leaking head gasket. A carboned up plug is too rich, and a oily plug would indicate burning oil.

My guess is head gasket.
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post #3 of 3 Old 03-08-2009, 06:42 PM
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1977 CJ5 
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Sounds like a head gasket, whoever rebuilt it either put it on sloppily or the head or block could be warped. If a plug is completely clean, its seeing antifreeze.

1977 Cj5, 258, T-18, 2.46:1 Dana 20, 2.5" BDS lift, OBA, 38.5's. Chevy 60 frt, 14b Rear, Full hydro, 102"wb, full DOM cage.
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