Hmmm.... if it seems to be building & holding boost, then the next thing I'd look at is inside the intake for carbon build up.Just did another test run to try the boost theory, manifold pressure goes to 30 and holds until I hit the said RPM band then drops and starts to slowly rise so I don't think its boost being lost. I tried lugging the motor and the manifold pressure holds all through the rpm until it gets to the 2700ish mark. I made a really crappy video of the scan gauge and didn't realize I bumped the rpm to volts until I was done. Commute traffic was building so I decided to abstain from another distracted WOT run until traffic lightens up. I brought up the clogged manifold theory to my mechanic friend and his opinion that would probably show more through the whole band. its really feels normal and then just straight up falls on its face.
This was really plugged up on mine, too, but the main problem was carbon in the intake runners. Some places had maybe half an inch hole left for air to go through. For what it is worth, I've owned the car since new (same year as yours). I don't know if it has a cat or not, but I've never done anything with the exhaust, just the intake.Also check the snow screen inside of the intake snorkel. A little tricky to find.. It’s near the rear of the battery next to the fender. They clog with leaves and such.
Mines a Golf, I think the air boxes are different. I didn't look to hard, but I believe my snorkel is just above my grillAlso check the snow screen inside of the intake snorkel. A little tricky to find.. It’s near the rear of the battery next to the fender. They clog with leaves and such.
Exactly what we think happened, got it to mechanic he hooked up his scanner. I think the timing was supposed to be 77 degrees if I remember right. It's currently 255. Lucky it didn't jump any more and crush my valvesThat doesn't sound good, wonder if the timing belt jumped a tooth or something.
When mine wouldn't start after some googling that was also the first thing I checked....... I wasn't so luckyAfter a little research, I found the anti-shudder valve was stuck shut. This valve just shuts off the air supply to make the engine stop quickly when you shut it down. Anyway, that valve was stuck shut. As soon as I knocked the valve open, it started right up!