Significant error codes causing LARGE issues
The engine crapped out before you got it home and the dealer replaced the engine? They replaced the engine and the replacement engine is an oil burner?
I would seriously be thinking about returning to the dealership. However, you will need to look at the sales agreement. Florida does not appear to have a buyers remorse law so you would need to see whether the sales agreement has a return period. If it doesn't then you are stuck with the car and you need to determine whether the sales agreement has any warranty provisions. If the sales agreement stipulates sale 'as is with no warranty expressed or implied' you may be screwed. You can consult a lawyer; but, that might be just flushing money down the toilet.
With these additional details this is turning into a can of worms and potentially way too messy for diagnosis via a forum. There are huge questions like if the engine was replaced did they get the matching ECU or have they mixed and matched? If you are stuck with the car I would be inclined to take it to an independent Audi specialist for further assistance.
Maybe a HPFP issue. You've already checked the intake path hoses? Pressure or smoke test the intake path; maybe a hole in the intercooler? Etc.
Those voltage levels for a running engine are too low. Should not be in the 12s with a running engine.
None of those DTCs are "confirmed" in the posted scan.
Maybe a HPFP issue. You've already checked the intake path hoses? Pressure or smoke test the intake path; maybe a hole in the intercooler? Etc.
Those voltage levels for a running engine are too low. Should not be in we12s with a running engine.
None of those DTCs are "confirmed" in the posted scan."
As I am completely new to all of this, I don't fully understand what you're stating. I understand the PCV part but I'm not hearing the sound you described and I have no idea what you mean by "IM".
I have no idea what HPFP means. No I haven't anything like what you suggested as I am new and I'm trying to learn. I plan on pulling all 4 coils to check their status this weekend and will post what I find. Is there anything else anyone can suggest to try?
My first vehicle over 50 years ago was a VW bug and my last vehicle purchase was to be this Audi so I'd really like to repair it. Thanks for any assistance.
HPFP = high pressure fuel pump
I'd probably start with what's going on with the voltage values, engine off and engine on. You'd need VCDS to see what the J533 is commanding the alternator to produce, then see if that voltage is actually showing up at the battery.
Even if the engine operating voltage is below spec, that would likely not generate misfires due to weak ignition. Most modern ECUs adjust ignition dwell time to compensate for low voltage during starting so the vehicle running voltage would have to be 10 volts or less before the coils failed to produce a healthy spark. Low running voltage will cause lot of other problems which seems to include mystery error codes that really don't exist. However, if you have a bad electrical connection on the 12volt power supply to all four coils that can create a low voltage problem right at the coils which may cause ignition problems on all four cylinders. But, that is not a coil problem, that is a wiring problem. You would need to inspect the wiring to the coils to determine whether that is the problem. Given what limited vehicle history you have shared I would be looking at fuel mixture problems first rather than ignition problems.
If you can get the engine running and allow it to come up to operating temperature which would put the ECU into closed loop fuel control, you should be able to use VCDS to look at the short term and long term fuel trims. Fuel trims are the amount of correction that the ECU is applying to bring the fuel mixture to the correct value. In a perfect engine in a perfect world the fuel trims would be 0.0 %. If the fuel trims are high positive numbers then the engine is running lean which can cause misfires and all the things that SMac770 mentioned are possibilities.
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