On a 94 mercury tracer with 1.9L engine if the timing belt slipped tooth will there be noise?

Yes, a slipped timing belt tooth on a 1994 Mercury Tracer's 1.9L engine will almost certainly produce noticeable noise. The exact nature of the noise will depend on how many teeth slipped and which components are affected, but you'll likely hear:

* A knocking or rattling sound: This is the most common symptom. The pistons and valves are no longer precisely timed, leading to impacts between them.

* A grinding or scraping sound: This indicates more severe damage, possibly involving valve-to-piston contact.

* A change in engine performance: The engine might run rough, lose power, or even fail to start.

A slipped tooth is serious and should be addressed immediately. Continuing to run the engine with a slipped timing belt can cause catastrophic engine damage, requiring a costly rebuild or replacement.