TJT

I am currently having issues with my S6 and I cannot figure out what is going on. I feel like I have tried everything, but I know there is something I have to be overlooking. What I know thus far:

-Replaced ignition

-No power to fuel pump fuse

-Fuel pump relay is okay, fuel pump is okay

-No ignition spark

-When key is in on position check engine light does not illuminate (supposed to)

-Checked the ECU to make sure there's no moisture in there and that checked out okay.

Any thoughts on what else could be preventing my baby from roaring back to life? Thanks in advance!

-Trace

GoHeels

So it's turning over but won't fire up...

Is the battery strong? ..it has to turn over at a certain rpm for fuel to trigger. A weak battery might come up short. Here's a link quattroworld.com Forums: Potential solutions to why your AAN-powered UrS isn't starting with more trouble shooting.

sciroccosven

Not sure how you test if it's working or if it cuts your fuel power but look into the crank position sensor near the bottom of your block. If that's not working car won't start. There are two identical plugs with two slightly different part numbers. I swapped them with a working one to check for my function.

I looked into it when no was having issues but doing coil pack swap fixed everything for me. I didn't have the issues you are having. Good luck, very frustrating stuff.

TJT

Battery is working fine, but that is a good link, I'll look into it and check the battery again also!

UrS4boy

If the yellow CEL does not come on when you turn the ignition key to ON/RUN, then you either have a bulb burnt out in the CEL position *OR* you don't have power to the ECU because the ECU fuse is burned out *OR* you have ignition switch problems.

Ignition switch replacement DIY: http://12v.org/urs/IgnitionSwitchReplacementDIY.pdf

The ECU is in the passenger footwell. Find it and check the fuse in the red holder.



Do those and then come back with the results.

TJT

Dave, I was just looking in the kick panel and initially couldn't find the fuse you were referring to. I looked closer at the diagram and realized it was right next to the ecu, not in the kick panel. I replaced the fuse and it started right up. Thank you so much for that!

Now the issue is the idle and the performance. It is idling very rough and there is hesitation in the acceleration. Do you think it is probably more of a POS issue or coil packs?

UrS4boy

You very likely have a coil power wire that is losing or has lost some of its insulation and when it grounds out, it is blowing the coil fuse. OR it is an internal coil fault, leading to poor spark conditions, rough running, missing etc. Remove the coil pack (the four bolts holding the "20V turbo" cover down and examine the coil wires, the rubber boots from the coil to the plugs and check the plugs for tightness (22 lb-ft torque, tighten only, don't back off first, just tighten).

TJT

Ok, will do. I'll let you know the result.