the ticking noise is a small exhaust leak close to the exhaust headers or exhaust pipe near the engine.
SEAT BELT
A ticking noise in your 2002 Mercury Mountaineer could be caused by several issues, such as low oil levels, which can lead to inadequate lubrication of engine components. It might also indicate a problem with the valve lifters, worn-out timing chain, or exhaust leaks. Additionally, if the noise is coming from the wheels, it could be related to brake components or wheel bearings. It's best to have a mechanic diagnose the issue to prevent further damage.
harmonic balance maybe bad
possibly you need a better grade of gas?
The 2002 GMC Envoy typically has two oxygen sensors located on the exhaust system. The upstream oxygen sensor is usually located near the exhaust manifold before the catalytic converter, while the downstream oxygen sensor is typically located after the catalytic converter.
The humming noise can be in your exhaust system. The exhaust will heat up and seal the area where there can be a leak. The hot exhaust will cause the noise to decrease.
My car was making this noise when I started it up. the noise went away after driving for a while. turnd out I just needed more oil.
A gasket leaking will cause this noise. Did you torque to the right specs and in the right sequence then retorque after 3 heat cycles.
where is the oil filter located on an 2002 GMC Envoy
Where to hook code reader 2002 envoy
GMC Envoy was created in 2002.
Riunning lighs not working 2002 gmc envoy