bushido

My car is having a series of problems. First the overboost/irregular boost issue, which was never resolved. Now it's stuttering at high boost. I'm guessing it's a lean stutter because the car was running very lean last time I checked (white plugs/o2 sensor; -7.5% block 32). I know the MAF is fine, so I decided to pick up a new fuel filter and new plugs (NGK PFR6Q) while I was at it. Any other suggestions at this point? Will plugs gapped at 0.0032 be ok with my current mods (chip, modshack stg3, FMIC, downpipe)? TIA!

JohnLZ7W

coilpacks

bushido

and swapping coilpacks to check if necessary.

bushido

when replacing coilpacks, just replace the faulty one or all 4? thanks!

JohnLZ7W

however last time I was getting misfires they weren't showing up in VAG. I took a guess and replaced #3 and #4 and that did it. You can always do just one at a time and see which one makes it go away too but that's a pain in the ***, two at a time make it a bit easier.

bushido

Thanks for the tip. I'll try the fuel filter and plugs first, then move on to coilpacks if necessary

TTschwing

Lean stutter and your Block 32 readings point to a fuel problem. Either in delivery, Vac leak or sensor (MAF) output..

JohnLZ7W

I never really had any stuttering when my fpr hose was torn but did get slightly white plugs and negative block 32 numbers.

bushido

Also know that it's not the combi valve or FPR hoses because I replaced those a couple of weeks ago with silicon hoses to try solving lean problem.

Just Vag'ed my car a couple of minutes ago and pulled 2 codes:

- S1 O2 sensor circuit malfunction intermittent
- S2 O2 sensor no activity intermittent

TTschwing

Bad info from them will result in incorrect fueling corrections..