Originally Posted by Hiking Doug
Thanks for replies. Checked plug, all secure. Heading south due to smoke, code has not returned, yet. Only appears on startup, first 1,000 revs. Will do work in Bellingham.
ArcticTraveler, safe journey and again thanks for introducing me to this site.
We’ve had an issue similar to this on various units (although rare).
- How long does it need to be sitting before starting it up to cause the issue to occur?
- does the van have to have been running up to a certain temperature before shutting it off and turning it back on?
One theory: if an engine has a slight head gasket problem, this may cause slow seepage of antifreez into a cylinder. This happens usually after the engine ran enough to build some pressure in the cooling system. Once the engine is shut off (usually for some time), the combination of a faulty head gasket and relatively high cooling system pressure may allow antifreeze to enter the cylinder fouling out the spark plug. A misfire would occur upon next startup and clear up within seconds after the accumulated antifreeze burns off.
We have tested this using a bore scope and cooling system presurizer. We would remove the spark plug of the effected cylinder, camera scope the cylinder while pressurizing the cooling system. Careful inspection of the cylinder walls would reveal the antifreeze intrusion if present.
Hope this helps!