Smoking diagnosis

H

hillbry

Member
Have a sii with a 345 with stock gauges and a 21 circuit ez wiring harness. I also just got a smaller pulley put on the 63amp alt, don't remember the diameter but only slightly smaller.

So the Scout had been running a little Rich but smooth otherwise until the battery died cause the alt was not wired correctly, which is fixed now. When I started it up after the alt fix it has been running a little rough and now has alot of white exhaust coming out. It does not smell like oil but does smell Rich. Is this just a carb tuning issue or is there something else going on?

Also, the stock amp gauge now reads as if it is charging. I have never seen the gauge move from dead center. Does this just mean the battery was not fully charged and needs to be charged more or is it due to the smaller pulley?
 
Is the white exhaust smoke or steam? Holding a piece of cool glass in front of the tail pipe for a bit will tell you. If you've got condensation then pull the plugs and look for the clean or rusty one.
 
Remove the radiator cap while the engine is running. Do you see any air bubbles in the coolant? Shut off and pull the crankcase dipstick. What's the oil look like? Should be amber if changed recently. Also remove the oil fill cap. If what you see looks like a chocolate milkshake, don't run the engine any further. Post up with your results.
 
Alright sorry for the delay. There was a little condensation with the exhaust on the glass. I have only checked one side of the plugs so tonight I will check the other side. All the plugs were black and nothing seemed out of the ordinary. The plugs are brand new delco's.

There are no bubbles in the radiator while running. I was already planning on changing the oil and filter so I did so and the oil was not chocolate milkshake color.

The motor smoothed out after it warmed up and a fair amount of the smoke went away but it is definately still present. When I hit the gas the white smoke turned to black and then back to white smoke upon idle. It is definately running very Rich.
 
All engines will "steam" a piece of glass or mirror during warm-up. That is the condensation that forms as the hot exhaust gas hits the "cool" exhaust plumbing. It normally goes away after five minutes or so but that is determined by the ambient temperature.

If you want to determine if you have an "internal" engine coolant leak, that is done by using the chemical test found in most auto parts and performing an engine cooling system pressure test sequence using a pressure test rig.

Run it for several hours and see if the smoking doesn't clear up or minimize, this engine has been badly neglected for many years and needs some time on it in order to determine what truly needs to be done next.
 
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