My question concerns the exhaust/intake pipe for our forced air oil furnace. ... My gutter caps never get clogged with leaves, however, oak tree catkins are another story.

Q. My question concerns the exhaust/intake pipe for our forced air oil furnace. The exhaust pipe is inside the intake pipe. Both are mounted outside the house about one foot above ground level.

Cleaning the Idle Air Control Valve. Locate the idle air control valve. It is usually found on the intake manifold and attached to the throttle body. Before beginning the process, make sure the ...