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it could potentially be because its old or if you dont get oil changes that is most possible
From va6yag:
Actually, it could be a few things. One cause of black smoke could be that you're "running rich"- in other words, the fuel/air mixture that is being burnt in the cylinders is not correct- there's more fuel than air. This could be caused by incorrect timing, a faulty EGR, damaged valves or your computer not mixing the fuel/air in the correct ratio. Another cause may be faulty spark plug leads, or fouled spark plugs. Your best bet is to get a tune up done on the van, along with an oil change and a radiator flush. That will eliminate the spark plugs, leads, air/fuel mixture and the timing as possible causes of the black smoke.
If that doesn't solve the issue, you could be looking at something far more serious. Get the van looked at by a competant mechanic.
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∙ 13y ago
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