Okay, this problem may need the Dr.House of tdi knowledge. I bought my 2002 Jetta TDI about 2 months ago. When I bought it the engine light was on and it was a P1556 problem. From there I took apart the intake and replaced it with a new one, and replaced all the gaskets with new ones when I put it back together. The intake was clogged pretty good, but still no boost from the turbo. From there I replaced the N75 valve with a new one, and replaced all the vacuum lines, as well as a new bosch fuel filter(air filter is clean). It seemed as if that fixed the problem but the code would still reoccur and the boost would only last a few seconds then cut out. I was never able to go completely down a freeway onrap without it cutting power. I restarted the engine and it would seem to come back for a minute, but then I havent felt boost after the first few time doing this. In other words, I definately do not feel any boost at all now. Finally, I replaced the actuator with a new one. I also replaced the MAF with a new bosch one.
Then, I realized I was probably doing the diagnostics in reverse order. First I should see if there is vacuum, and why it is not reaching the turbo actuator. I made my way to the hard line from the brake booster which has a type of T which I beleive supplies vacuum to the system. However, with the engine running (at idle) there is no air flow comming from the T that is inline of the brake booster line that comes out to the side of engine. There is no obvious leak near the brake booster, and my brakes operate normally.
Shouldn't this location offer a constant vacuum?
Also, any other ideas on what I could test next to get my boost going?
I appreciate any help you guys can offer. I have been up and down every forum, website, and search engine and have found nothing similiar to my issue. I have only a simple scanner that allows me to read and erase codes.
Then, I realized I was probably doing the diagnostics in reverse order. First I should see if there is vacuum, and why it is not reaching the turbo actuator. I made my way to the hard line from the brake booster which has a type of T which I beleive supplies vacuum to the system. However, with the engine running (at idle) there is no air flow comming from the T that is inline of the brake booster line that comes out to the side of engine. There is no obvious leak near the brake booster, and my brakes operate normally.
Shouldn't this location offer a constant vacuum?
Also, any other ideas on what I could test next to get my boost going?
I appreciate any help you guys can offer. I have been up and down every forum, website, and search engine and have found nothing similiar to my issue. I have only a simple scanner that allows me to read and erase codes.