On the 2.8 / 2.9 / 3.0 the number 1 position on the distributor cap is at the back , towards the firewall and towards the passenger side of the motor
The firing order on a 2.5 Pontiac motor is 1-3-4-2, 1 being in front. The chilton book shows the firing order and the wire placement on the dist cap. #1 is at 10 oclock.
4 cyl = firing order 1342, # 1 is front cylinder 6 cyl = firing order 142536, # 1 is passenger front cylinder, dist. rotation clockwise
rotate the engine to top dead center on the compression stroke on number one cyl. remove the dist. cap the rotor bug will be pointing at the number one on the dist cap. if the cam and crankshaft are timed right. timing on the wires are clockwise on the cap
Timing and idle are computer controlled and not adjustable
After bringing your engine to top dead center, line the distributor up so the rotor faces the number one cylinder. Rotate the dist. so the closest terminal lines up with the rotor. This will be your number one in your firing order. Mark that terminal #1. Tighten the dist. in place. Put your wire from the cap to #1 cyl. Now follow the firing order for the rest of the wires. The dist. rotates clockwise so put the wire on the next terminal on the left and route it to the next number cyl. in the firing order. Do this till all are connected. Here is a link to help. http://www.classiccarauto.com/impala/how_to/install_distributor.shtml
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Right front when looking down from top, with pulley in front. If it has a distributor, which most of these 3.3's do, it will also show #1 cyl on the cap, beside the terminal that the spark plug wires plug into. Easy to trace out where it goes: Right Front cyl. However; If a cheap dist cap was installed, it might not have the wires numbered. It's interesting that most Technical Specs books these days, like AUTODATA books, which cost a lot, DO NOT have this information in them.
This will also work for the 2.0L engine as well as it has the same configuration as the 2.2L According to a manual, 4 cyl. firing order is 1-3-4-2. #4 cyl. being closest to distributor. On dist cap #1 is top right position on 2.2L engine, and is the bottom left position on 2.3L.
the firing order 1-8-4-3-6-5-7-2. okay this is the way i set mines. on the dist. the number 1 plug terminal (should be facing the cyl. bore number one) then from there go clockwise in the firing order. another way is to look at the dist rotor when the number 1 cyl. is in top dead center(be careful there are two top dead centers for ever dist. rotation). when you have the right top dead center then go by the dist. rotor to which every dist. plug terminal the dist. rotor points to, that would be number one plug wire then go clockwise in firing order.