Mechanics

I HAVE A P-3500 STEP VAN WITH A 6.5 DIESEL ENGINE/NOT TURBO.

1997 GMC Other • 14,300 miles

It starts and runs very well, then after a few minutes, white/gray looking smoke starts to go from light to heavy, but it still runs fine. What is causing this? I have been told that it could be EGR vaulve, but it is ok. Where do I look next.
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Overworked
September 10, 2011.



Make sure your vehicle isn't using coolant. Check fuel pressure.