Vehicle has rough idle, lack of power on acceleration, or compression
slightly lower than specification for cylinders in one bank.
When reassembling the engine after heads have been removed, the procedure for
installing the cams to the pulleys may be unclear, which can result in
installing the cam belts so the cams are off timing by one tooth or more.
Use a straight edge to align marks on the gear and cylinder head. (See
Workshop Manual, Section B1, Assembly: Timing Belt.) Ensure that the slack in
the belt is between the two cam pulleys, then install the top idler pulley.
Never force auto tensioner.
When installing the cam pulleys use the following as a reference.
- Right Intake cam number 421 dowel must correspond with "B" on
- Right Exhaust cam number 441 dowel must correspond with "A" on
- Left Intake cam number 431 dowel must correspond with "B" on the
- Left Exhaust cam number 451 dowel must correspond with "A" on
- The camshaft pulleys are different for the right and left cylinder head.
- The exhaust pulleys have a ridge on the outside edge that act as a timing
NOTE: See Workshop Manual, Section B1, Assembly: Timing Belt