Intake cam setting - 1991 Toyota Corolla

Exhaust camshaft gear and Intake gears have dots on them, chain has colored links. Align colored links to dots or count 14 links from ex cam dot to intake dot. Make sure that the mark on the cambelt side is set first on ex side. Small hole on ex cam gear (cambelt) side to line up with mark on head.

There is a Camshaft Alignment Timing Tool that is made to hold the cams and another one to find TDC on the crank.

YOU HAVE 2 CAM GEARS . A INTAKE CAM AND AN EXHAUST CAM . ON THE INTAKE CAM THERE IS AN I FOR INTAKE WITH A MARK STRAIGHT ABOVE IT AND ON THE EXHAUST CAM THERE IS A E AND RIGHT ABOVE THAT IS A MARK. LINE THE I MARK UP WITH THE MARK ON THE BACK OF THE INNER COVER [WHICH IS A LITTLE MARK KINDA LOOKS LIKE AN ARROW] THIS IS ON BOTH SIDES . ON THE CRANK THERE IS A KNOTCH ON THE BACK OF THE TIMING GEAR FOR THE CRANK AND A MARK ON THE THE COVER LINE THE 2 UP AND YOUR THERE. IF YOU HAVE ANY MORE QUESTIONS YOU CAN E MAIL ME GOOD LUCK

How do you know the cam sensor is bad? You tested it how? Don't go by a code being set,you'll be wrong 50% of the time.

Here are the diagrams for the secondary timing chains (exhaust cam - intake cam) and the primary timing chain. (courtesy of AutoZone)

Hopefully this will help. This is for the 1.8l if you need the 2.5, I may be able to help.

well you need to start from the crank and set that you will see a dot on the bottom gear set it straight up next the cams you have 4 cams all need to be set ok the cams will need to be set as follows the 2 inner cams next to intake manifold should be set at li,ri.........the 2 outer cams set at le,re 90 degrees straight offf the head

Cylinder #1 set at TDC, compression stroke. Cam marks level with head, aligned with mark on cover, or if unclear where to mark the cam: SET Cam at point where intake valve has just closed and both valves are shut on cyl. #1, cam gear marks should start to appear more clearly to technician, along with corresponding alignment points. This is ballpark. Remember, on clockwise rotation, after cylinder #1 intake valve(s) are shut, the cam will continue to rotate 90 degrees and come to rest at a position in which both exhaust and intake valves are at their maximum lash point. (the most play) Hopefully if you get this close, you will decipher the marks that exist on your Bavarian machine.

That is a dual overhead cam engine. On the oil pump housing there is an arrow cast into the housing. Line the arrow on the crank pulley up with the arrow on the oil pump housing, that will set your crankshaft in time. Next you'll need to set your camshafts. This is the procedure for doing that......the exhaust cam gear (nearest the firewall) has markings on it that say "2.4L" on one side and "up^" on the other side. On the left side of the gear is a notch on the tooth. This notch MUST be set at 3:30 and the intake cam at EXACTLY 9:00. Once you've installed the timing belt and you rotate the tensioner to "tighten", the offsetting of the exhaust cam will match up with the intake cam. And presto!!! your timing is now set. Make sure you turn the crank sprocket TWO complete revolutions and verify your timing marks.

Chris