Boost Leak maybe?

[B5Mark]

I have a 2000 Audi S4 V6 2.7. When I step on the gas and get to around 4000rpm the car starts to choke and make a popping noise out of the exhaust. Then it goes into limp mode. I have replaced all of the turbo piping. So what else could be the problem? I replaced the MAF sensor with my buddies just to test if that was the problem, it wasn't. Any ideas?
Thanks in Advance.

Things done:
Turbo Piping replaced
All coils and spark plugs.

[xwilliams23]

I have a 2000 Audi S4 V6 2.7. When I step on the gas and get to around 4000rpm the car starts to choke and make a popping noise out of the exhaust. Then it goes into limp mode. I have replaced all of the turbo piping. So what else could be the problem? I replaced the MAF sensor with my buddies just to test if that was the problem, it wasn't. Any ideas?
Thanks in Advance.

Is the car stock?

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[B5Mark]

Is the car stock?

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yes it is, besides a front mount intercooler.

[xalents23]

You need to check for fault codes with vagcom. If you throw any codes, it will help you diagnois your problem.

[xwilliams23]

They're a few things you could do. From the looks of it you should

1. Pressure test the boost system, fix any leaks.*
2. Change out your spark plugs gap at .028
3. Test for and replace any bad coils, or just replace all

Edit: Is the CEL on? Or throwing any codes

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[B5Mark]

You need to check for fault codes with vagcom. If you throw any codes, it will help you diagnois your problem.

Will do. Thanks.

[B5Mark]

They're a few things you could do. From the looks of it you should

1. Pressure test the boost system, fix any leaks.*
2. Change out your spark plugs gap at .028
3. Test for and replace any bad coils, or just replace all

Edit: Is the CEL on? Or throwing any codes

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The CEL flashes when I step on the gas around 60mph and get to 4000RPM.

I have replaced all of the coils, and worked with the spark plugs.

[xwilliams23]

The CEL flashes when I step on the gas around 60mph and get to 4000RPM.

I have replaced all of the coils, and worked with the spark plugs.

Since the CEL is flashing it's saying you have a misfire.

[B5Mark]

Since the CEL is flashing it's saying you have a misfire.

Correction, this was before i replaced the coils. I have no CEL on any other times.

[xwilliams23]

Correction, this was before i replaced the coils. I have no CEL on any other times.

Alright well once you get those codes from the vagcom. We can help further

[DieselElectric]

Correction, this was before i replaced the coils. I have no CEL on any other times.

So does the CEL flash or not?

If it flashes, it's indicating conditions that are dangerous for the catalytic converters. I.e. misfires.

What does "worked with the plugs" mean? Re-gap? That doesn't usually work well.

Check for codes, perform a boost leak test.

[B5Mark]

So does the CEL flash or not?

If it flashes, it's indicating conditions that are dangerous for the catalytic converters. I.e. misfires.

What does "worked with the plugs" mean? Re-gap? That doesn't usually work well.

Check for codes, perform a boost leak test.

The CEL does not flash.
We changed the spark plugs.

I will do vagcom and get a boost leak test done.

Thank you.

[lazerb5s4]

My money is on one of the ICMs or a coil. I had the exact issue a few weeks ago although I'm not stock. My CEL flashed when the misfire happened, but then will go to a steady CEL until it's reset. Not ideal, but when you get the CEL, go to your local auto parts store and have them read the codes, regardless of the OBD-II scanner, they should be able to tell you what cylinder(s) are affected.