D5 (2005 on) Maybe it is the MAF sensor after all?

[5cilinder]

Or intercooler, their weak

[cheshired5]

Originally Posted by 5cilinder

Or intercooler, their weak

They're not weak and can easily handle stock boost indefinitely.
People just don't monitor boost and early overboost issues.
They then fit a new intercooler, moan about the quality and still don't monitor boost.

If you allow overboost, something will split. That's normal, not a weakness.

[5cilinder]

Aluminium cant crimp expand crimp forever without breaking , add heat, corrosion , condensation of oil and water to a high mileage car and it will give eventually.
And the fact its an intercooler original used in de t5 wich uses (much) lower stock boost will not help either.

[cheshired5]

Originally Posted by 5cilinder

Aluminium cant crimp expand crimp forever without breaking , add heat, corrosion , condensation of oil and water to a high mileage car and it will give eventually.
And the fact its an intercooler original used in de t5 wich uses (much) lower stock boost will not help either.

I have 2 D5s on my drive. Both running correctly controlled factory boost figures and both on their original intercoolers
179k and 194 K miles

Totally straight and not a drip of oil.

[5cilinder]

You can have original boost figures with small leaks who dont throw codes.If the leak is on the topside of the intercooler you wont see any oilstains only if the leak is under
Mine was also running fine with correct boostfigures but had a tiny leak , pressurized the intercooler and heard a leak and saw an oilleak
Turbo can compensate for small leaks (at the expense of turbowear)

[cheshired5]

Originally Posted by 5cilinder

You can have original boost figures with small leaks who dont throw codes.

I don't wait for codes, I use live data and graphs.
Much more accurate.

[5cilinder]

Me also
But the live data cant see small leaks due to turbo compensation.
You have to pressurize to be sure

[cheshired5]

Originally Posted by 5cilinder

Me also
But the live data cant see small leaks due to turbo compensation.
You have to pressurize to be sure

That's a step too far for me if there are no boost or performance issues.
It would be like checking your alloy rims for tiny leaks when there's no issue of any consequence.

[5cilinder]

There are consequences in unwanted turbowear ,increased backpressure, and small leaks will grow larger in time and if it pops far away from home it will be limpmode
Not to mention that the slightly higher measured airmass also overcompensate in egr flow wich means extra soot and fuelconsumption
If you want to ridicule it
fine

[cheshired5]

Originally Posted by 5cilinder

If you want to ridicule it
fine

No ridicule, it's more that I've never heard of anyone pressure testing an intercooler when there are no boost problems.