HELP! I need help from the masters

[UrS4boy]

Sorry, to me, Cranking and Turning over mean the same thing!

Me too. Now "Firing" and "Catching" are two other things. I think Durr is saying that the starter engages the flywheel, causing the crankshaft to rotate but there does not seem to be any explosions of air and fuel mixture inside the cylinder walls as a result of this cranking.

This means *all* he has to figure out is whether a) the injectors are firing and b) the coils are firing during the cranking of the engine. If all things are wired properly (e.g. the G40) as he says, it could be that the engine is just not timed properly with respect to top dead center (and the resulting agreement in signals between the cam sensor and the crank position sensor). This has an ominous result, if true, because if the cams and crank aren't properly in sync, then valves are going to be slapped silly and bent by the pistons.

Some fundamental checks are needed Durr, before you go forward.

[madpugger]

Possibly the wrong coils connected to the wrong POSs?

You need to see if you have a spark I think, maybe take a plug or a spare one and put it in one of the coils and wind the engine over while someone looks for a spark. Dont touch the plug and ensure it is earthed, its hurts like a fecker if you get a kick off of one of them!

If you get spark then you need to check fueling...

[UrS4boy]

Possibly the wrong coils connected to the wrong POSs?

That is an entirely good possibility. Durr needs to have the four pin POS input connector with four wires paired with the three pin POS output connector with three wires on one POS and the other four pin POS input connector with 3 wires paired with the other three pin POS output connector with two wires on the other POS. I don't know if I want to even bring up the possibility that wires on that second pair may or may not have been swapped to make use the spare POS channel at some point in the past.

Durr: You might want to (or have to) read through this regarding the POS (NOTE: Bentley has errors that I point out):

http://forums.quattroworld.com/s4s6/msgs/15284.phtml

[UrS4boy]

You need to see if you have a spark I think, maybe take a plug or a spare one and put it in one of the coils and wind the engine over while someone looks for a spark. Dont touch the plug and ensure it is earthed, its hurts like a fecker if you get a kick off of one of them! If you get spark then you need to check fueling...

Another good possibility.

Durr: You might want to read this:

http://forums.quattroworld.com/s4s6/msgs/22611.phtml

[Durr McDanks]

I have checked timing and it is timed. I get fuel but I will check to see if I have a spark.

[UrS4boy]

Power Output Stage Wiring Info

I have checked timing and it is timed. I get fuel but I will check to see if I have a spark.

Check your POS connection "pairing" as I described above. Then there is the issue of whether or not cylinders 4 or 5 have been moved to a spare channel.

The wiring needs to line up with the ground on Pin 2/4 , with the pins crossing (1/4 to 3/3, 3/4 to 2/3 and 4/4 to 1/3) (the dark rounded rectangles are the switching transistors), as shown in this X-ray of a POS:

More detailed info including how to swap pins is available here:

http://forums.quattroworld.com/s4s6/msgs/15284.phtml

[Durr McDanks]

Is there anyway to tell the difference between the two POS's (3 vs 2 channel one) without an X-ray. Honestly I just connected them based on how I saw it in pictures.

[UrS4boy]

Is there anyway to tell the difference between the two POS's (3 vs 2 channel one) without an X-ray. Honestly I just connected them based on how I saw it in pictures.

You obviously didn't read the link to the POS information or not thoroughly enough. The POS units themselves are identical. They each have the capility of handling three cylinders. As it happens the AAN, ABY and ADU are five cylinders so one of the POS units is not fully utilized, i.e. it has a spare channel.

What I was trying to get you to check was whether you had the input and out connectors connected to a POS (one or the other) in the proper pairs, i.e. one pair is a four pin connector with four pins/wires (cylinders 1, 2, 3 and a ground (to pin 2/4) and its partner is a three pin connector with three pins/wires (for coils 1, 2, and 3). The other pair, for the other POS, the four pin connector only has three wires (cylinders 4 and 5 and a ground (2/4)) in it and the three pin connector (to the coils) only has two wires (for coils 4 and 5).

The purpose of the X-ray is to show you how pin 2/4 (the ground works) and how the pin numbering system works.

You can use this diagram to check the colours of the wires in the 4 pin POS input connectors (ignore the rest of the diagram since it is to do with the 1.8t coil packs).

[Durr McDanks]

Alright, I will check and re read everything, thank you.