On a road trip into BC, Canada right now, camping around different places and sometimes my phone doesn't have good signal. I've got a good assortment of hand tools with me, but left the laptop with the Bentley manual PDF's, VCDS-Lite and the KKL cable at home in Portland to have one less thing to worry about possibly getting jacked if we left the camper unattended someplace.
'98 Passat AEB engine, swapped into a '75 VW Bus high-top camper. Stock ECU, only real mods are an ICM delete with ATW bolt-down Hitachi coils and the rearranged intake & exhaust plumbing needed to fit the motor into the engine compartment. Plugs about a year old, exhaust is 3" through the cat then 2.5" through the muffler, cat only a couple years old. It's been running great for a couple years, did fine on the drive up from Portland on Monday, did fine driving around Vancouver for a few days. Couple of hours after we got to Vancouver Island the other day I noticed the power and acceleration were down, and that I was getting maybe 5PSI boost at best. The next morning it was acting fine for about the first hour and easily hitting 10PSI boost, then back to what it was doing before and hasn't changed since. My first thought was that I got some bad gas from a no-brand station I stopped at before the ferry, but I've run through that tank and burned through a tank and a half of Shell premium since then with no change. I've looked for leaks in the turbo/IC/TB piping and connections and didn't find anything, plus the silicone IC-to-TB hose swells when I open the throttle like it always has .. so even without the gauge I know I'm getting *some* boost, just not what it should.
I'm suspicious of the diverter valve (OEM plastic, 2+ years old), maybe the knock sensors and the Chinese fleabay MAF I've got in there .. though I've been running that fleabay MAF all along with no problems. I've got a multimeter with me so I can test electrical things (wire continuity to ECM, ohms of N75 valve, etc) if I know what I'm looking for. Drives OK so it's not like we're stuck. If I can find what's wrong and it's an easy fix, great! If not, I'll dick with it when we get home in a few days.