NOLAN5162

I just recently installed a new engine. i have been going extremely easuy on it.
I am currently at like 400 miles on the new engine.

I have a problems with it bogging out ALMOST as if it is hitting the rev limiter when the pedal is more than halfway to WOT. The boost gauge read about 10psi and bounces at 10psi.
Origianlly it woul get to 15psi with occasional spikes at 16psi.

I had to replace my modified K04 turbo with a new non-modified turbo.

I am wondering what the problem could be.

I have a couple of theories on this but keep in mind that I myslef am not a mechaninc, nor am i the one who originally modified this car.

1. the software on my ECU was modified to take advantage of the modified K04's larger compressor inlet and compressor wheel. Therefore the smaller compressor wheel on the new k04 is not reacting properly.

2. Sparkplugs- they are currently gaped at 0.40", which they came at. I did not regap them to 0.32". However before my TB destroyed my engine i had they same sparkplugs. gapped the same and i never had this problem.

3. Fuel filter, hasn't been changed, and the car has been sitting fro like 6 mos. where the hell is it?

4. Some kind of vacuum leak?

Any suggestions on what it could be?

Thanks for any help in advance.

xr4tic

datalog the O2 voltage and see if it's going too rich or too lean.

Try re-gapping the plugs to 0.032", it could be blowing the spark out.

Fuel filter is in the back on the Quattro A4/S4, you have to drop the fuel tank down slightly to get to it.

Is the BPV OK?

NOLAN5162

Would the BPV be "clicking" if it wasn't functioning properly?

Thanks for the help.

I don't have a VAG-COM. My Dad has a snap-on diagnostic computer. Will that work? Unfortunately he is in Houston for the next 5 weeks.

Should I try to resolve the other issues first?

xr4tic

gap them down.

Also check every hose you can find and make sure it's tight, especially the turbo hoses.

The BPV has two ~1" hoses running to it (one from the turbo outlet, and one from the turbo inlet), and a vacuum line, there is no sensor to it. The clicking thing is for emissions.

NOLAN5162

THANKS!

NOLAN5162

also i am running autolite's
(got them for free and figured they can work for now, haven't decided what kind of plug i want to run)

You think that is an issue? I ran them before with no problem.

So many conflicting opinions on sparkplugs i can't decide what to get.

xr4tic

0.032" should be fine

NOLAN5162

Seriously.....Thanks.