Where are the timing marks on a 4ZZ-FE engine?

SOURCE: '03 Toyota Corolla 1,4 VVT-i 4ZZ engine idle rpm

Idle is factory set and cannot be adjusted, your best bet is checking for cracked hose pipework for air intake at idle,(not at problem under exceleration and driving) Any slight upset to the air /fuel ratio will be most prevelent at idle speeds.Check hoses where the meet metal flanges on manifold intakes and any sharp bends in ppipes.Good luck

SOURCE: '03 Toyota Corolla 1,4 VVT-i 4ZZ engine idle rpm

Check your idle speed control valve situated at the bottom of the throttle body. Sometimes the valve sticks and will make the engine rev high or low at idle and the ECU can't adjust it properly.

SOURCE: replacing timing chain 2000 corolla 1,8 eng

!!! Check first if engine valves are not bended !!!

The timing chain diagram & procedures for 2000 Toyota Corrola 1.8 engine:

Special tools:
1. Crankshaft pulley holder - Tool No. 09213-70010/11.
2. Crankshaft pulley puller - Tool No. 09950-50012.

General precautions:
1. Disconnect battery earth lead.
2. Remove spark plugs to ease turning engine.
3. Turn engine in normal direction of rotation.
4. Observe tightening torques in pictures below.
5. Do NOT turn crankshaft via camshaft or other sprockets.
6. Do NOT turn crankshaft or camshaft with timing chain removed.
7. Mark position of crankshaft position (CKP) sensor before removal.

Valve timing procedures:



1. Ensure crankshaft pulley and timing chain cover TDC marks aligned [1].
2. Ensure teeth timing mark on each camshaft sprocket aligned.
3. 1ZZ-FE/3ZZ-FE/4ZZ-FE [2].
4. 2ZZ-GE [12] OR [13].
5. If not, turn crankshaft pulley 360 degrees.
6. Remove chain tensioner, tensioner rail and chain guide.
7. Check chain for wear.