My HMMWV is nearly restored and fully sorted. Enjoying it every day. However, I've now run into another bug: There is now a low RPM chirp coming from the engine area. It chirps at every revolution, so I do not think it's a belt (belts rotate slower due to size so I've seen most belt chirps occur at the time a part of the belt reaches the pulley in question). Just to be sure, I sprayed some belt eze on all the belts and didn't help.
The chirp sounds more metallic, like a loose bolt caused by vibration, in which case it would also occur at every revolution.
I am thinking it may be a bearing for this reason. Also, I remember hearing a "rattling" sound at idle before this sound started a few weeks ago.
However, the repetitious chirping sound only occurs (loudly) when idling in D at intersections and sometimes at idle in N. Obviously, the frequency of vibration is more pronounced in D with the foot on the brake, so this is why I was leaning toward the lose bolt theory.
The sound totally disappears with even the slightest amount of gas.
Are there any common places where this sound would occur? I suspect it won't be easy to find.
The chirp sounds more metallic, like a loose bolt caused by vibration, in which case it would also occur at every revolution.
I am thinking it may be a bearing for this reason. Also, I remember hearing a "rattling" sound at idle before this sound started a few weeks ago.
However, the repetitious chirping sound only occurs (loudly) when idling in D at intersections and sometimes at idle in N. Obviously, the frequency of vibration is more pronounced in D with the foot on the brake, so this is why I was leaning toward the lose bolt theory.
The sound totally disappears with even the slightest amount of gas.
Are there any common places where this sound would occur? I suspect it won't be easy to find.