91 3.1 spark plug connection

[powdertiger]

Is #1,3,5 on the back of the motor by the firewall or in the front?Car runs if I hook the plugs up as 1,3,5 in the back but the intake says #2,4,6 is in the back.If i hook it up acorrding to the intake it won't run.
Timing chain jump or is intake wrong?

[powdertiger]

Forget it.1,3,5 is by the firewall.I found it in my 1990 lumina factory service manual.Sure is stupid 2,4,6 is stamped by cylinders 1,3,5.Go figure.

[quaddriver]

what you are seeing is the intake RUNNERs are stamped, the runners cross the motor to get to the proper cylinder.

on a 3.1 the rears are numbered (left to right) - 1,3,5 and the fronts are 2,4,6.

since the firing order is 1-2-3-4-5-6 you can pair up the coil packs 1,4; 2,5; and 3,6. Each coil is triggered sequentially so all you have to do is get wires 1,4 (for example) to the right pack, they can end up on either terminal.