Toyota MZ engine

This page is a draft. It has not been approved yet, so read it with care.

Watch out for

Reputation: what owners and the press report. Tap one to see what to check.

Oil sludge and oil use Every version

What to check: Ask for oil change records, look under the oil filler cap for sludge, and look for blue smoke at start-up.

Wikipedia says the MZ engines are known for oil gelling, or sludge, from PCV trouble, worn parts and leaking valve cover gaskets, and that a class action was filed over it. 80/20 Automotive says sludge shows most easily with the front valve cover off.

Sources ^1,2
Failed knock sensor 1MZ-FE One source so far

What to check: Look for a check engine light and feel for lost power under load.

80/20 Automotive says the 1MZ-FE's original knock sensor gave trouble until a new one came with the 3MZ-FE, and that a failing sensor cuts power.

Sources ²