04Navigator04

I've noticed that when stopped at a light (holding the brake) but even when in park there's SLIGHT vibration throughout the vehicle (2004 Navigator), RPMs are steady but you can feel the vibrations a bit and if you focus on something outside the vehicle you can notice that it's vibrating.

Any ideas?

Bert

Sounds like an engine miss. Take it to Autozone and see if they can get a code.

04Navigator04

That wouldn't be too bad (pretty easy fix) but there are no codes at all..is it possible that there's an issue like that without CEL/codes popping up?

Bert

That can happen. If it has a miss for quite awhile it will set a code. sometimes there are spark plug boots that let the spark jump to ground causing a miss and no codes will be set for awhile. If you can feel it when it's idling, disonnect one fuel injector connection at a time until you find the one that doesn't change the condition and that's where to look further. Plug, coil pack etc.

chalupa1

I will start by listening at the engine with the hood open. I had the same problem and it happen to be a leak in a big vacuum elbow right under the engine cover. Change it and the problem stopped.