Pulsing power on hills?

[Big Man]

I noticed that while accelerating mostly up hills, my power seems to pulse. It accelerates for a second or two and then losses power for a second or two and continues the cycle. No major loss in power but noticeable. Just wondering if anyone has had this problem or might know what would cause this? Also, how much oil should be in the inter cooler.

 

[mohawk69]

It sounds like your N75 valve. It's a small cube shaped object mounted on your firewall on the drivers side. If it's never been done, replace the vacuum hoses that run from the n75 to the turbocharger. There is also a small vacuum tube in the ecm. If that doesn't do it try replacing the valve itself. Relatively inexpensive overall.

As for the oil, I think a few teaspoons is considered normal. Excessive oil can cause a runaway.

 

[Big Man]

Thanks, I replaced the N75 a few years back, and the vacuum hoses were replaced last year. I'll have to check the N75 again.

 

[mohawk69]

Did you replace the small hose inside the ECU as well?

 

[rdkern]

You might also want to check for intake clogging.

Can you take VCDS readings while driving? If so, log the maf and map's (requested & actual).

 

[bonham123]

When was the last time you put a fuel filter in it. I had this problem a couple weeks ago and that was the fix for me.

 

[16vjohn]

how much oil should be in the inter cooler.

Oil in the intake is normal. Oil from old turbo seals, crankcase vapors, etc... Consider the surface area inside the intercooler. All of those surfaces are coated with a film of oil as you drive. When the engine stops, the oil drains to the bottom. As mohawk said, a little is al right. There should be just enough in there to make a gigantic mess on the garage floor.