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When the coolant runs low the engine overheats and any item of carbon and carbonized
oil can burn and flake off in the combustion chamber on the piston or around the valves and cause clogging problems in these areas: 1. Spark plug clogged and not sparking well.
2. Valve is dirty on the seat and is burning or warping. 3. Catalytic converter is clogged
and the engine looses power at high revving.
Overheating engines also expand and warp, so the head gasket can be open and leaking fluids or oil into the engine, or gasses out of the engine causing low compression
skipping or roughness. Check with a mechanic and ask for a quick fix like revving the
engine with a good carbon cleaner additive, or even a fine spray of water can clean
the running engine enough that it will loose some of the carbon or glowing carbon
that may be causing dieseling . Heat can damage many fine tubes and spark plug
wires can melt and cause sparks in the dark when the engine is running in the dark.
The exhaust manifold can crack from heat, and sound bad. Now get this, the computer
can have a program to cause ruff engine running if the coolant sensor or temperature
tells it that something was wrong, you carefully clear the computer, see a mechanic.

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Q: Ran very low on coolant now car starts ruff?
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