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The firing order is 1-3-4-2
looking at the engine from the front of the car, number 1 is on the left side then number 3 is the 3rd one from the left then number 4 is the last one on the right then number 2 is the 2nd one from the left.
The coils should have numbers on them, match the numbers with the firing order.
audi code 16688 - cyl 4 misfire check spark plugs and coil packs and icms also if your valve covers have not been replace there could be oil in the cyl and made the spark plug go bad cyl4 is on the driver side first plug in front of the engine.same goes for 2.7T or 3.0
Have you switched the spark plugs to see if it is a bad plug ? Switching the plug in cyl 2 with another cyl will tell you if the plug is bad if the problem moves to the other cyl. It takes alot more voltage to fire a plug in a compressed cyl than it does out in the open. If the plug is fuel soaked it will never fire.
Facing towards front of engine-number 1 is on passenger side front cyl of engine. Number 2 is front cyl on driver's side-number 3 middle cyl on passenger side-4 on middle cyl driver's side-5 on back cyl passenger side and 6 on back cyl driver's side. The distributer rotates COUNTER CLOCKWISE-number 1 cyl's sparkplug wire attaches to distributer cap connection closest to number 5 cyl.-to your right side of this plug wire on cap would go cyl number 2-then 3-then 4-then 5 and then 6. The firing order is:1,2,3,4,5,6
the spark plugs are recessed in cylinder head,easyiest way to do remove air filter box on passanger side,remove spark plug wires give a twist then pull use 5/8 socket a3/8 swivel and a 12 inch externsion along with 3/8 rachet theses are tools of the trade, the extensions may not be avaible to you but these tools take the bending over and frustration out of the job, the plugs on the drivers side are easier nothing to remove but the wires good luck
2.3 and 2.4 has idi ign.syst. mounted directly on top of plugs,2.2 coil pack cylinder numbers are marked on it,from left of elect. connector on coil pack is 2-3-1-4where spark plug wires go,on block, cyl. from drive belt side is 1-2-3-4,timing firing order is1-3-4-2