Mazda 6 Service Manual: No.7 slow return to idle

No.6 cranks normally but will not start

No.8 engine runs rough/rolling idle

Other materials:

Mazda 6 Service Manual: Drive belt auto tensioner inspection
1. Remove the drive belt. (See DRIVE BELT REPLACEMENT.) 2. Verify that the drive belt auto tensioner moves smoothly in the operational direction. Replace the drive belt auto tensioner if necessary. 3. Turn the drive belt auto tensioner pulley by hand and verify that it rotates smoothly ...

Mazda 6 Service Manual: Electrical parts
Battery cable Before disconnecting connectors or removing electrical parts, disconnect the negative battery cable. Wiring Harness To remove the wiring harness from the clip in the engine room, pry up the hook of the clip using a flathead screwdriver. ...