I removed the pcv that’s connected to my K&N intake to the valve cover with a fuel like disconnect tool. Is it suppose to rattle like a normal PCV valve when shaken? I cleaned it with some electric parts cleaner and I can blow one way but not the other but it doesn’t rattle when shaken.

I replaced the one in the intake manifold when I cleaned the valves 20k ago. I’m fighting an issue with my LTFT running rich anywhere from -3.9 to -5.4 on my Aeroforce gauges. STFT varies from +2 to -3 while cruising and when I let off accelerator while getting on off ramp from 75 mph it will shoot all the way to -10 sometimes -15 for a split second on STFT.

During town driving 40 mph and constant shifting it will drop the LTFT to -2 and sometimes -1. During the summer heat this year my LTFT was all the way close to -9 during the 95 and 100 degree weather and 90% humidity. Now the cool weather is here my LTFT is low like what’s stated above.

I’ve replaced with a new OEM maf, both upper and lower O2 sensors. 3 bar map sensors from Zzp have been removed and checked o-rings, connections, and cleaned. Checked all clamps on my ZZP charge pipes and ZZP intercooler. Checked turbo for shaft play. Ac delco OEM plugs gapped at .32. Cleaned my K&n filter and lightly oiled and dried before installing. Cleaned & lubed forge BPV. Replaced purge vent valve on intake and purge solenoid on evap charcoal canister.

Running out of ideas because I’m getting 1-3 intermittent misfires on random cylinders and wonky rich fuel trims on LTFT when letting off accelerator and when I reapply accelerator.

If anyone can confirm the PCV check it’s one less thing I will replace. Maybe next is doing and exhaust leak smoke test. I’m at a loss….

mods:
k&n intake
forge bpv
Gmpp clutch
ZZP charge pipes & intercooler
ZZP catback & catted downpipe
Zzp tuned pcm & 3 bar map

 

That line shouldn't rattle when shaken. The flow one way and not the other is correct, and it's the fresh air inlet for the PCV system.

Don't get overly focused on STFT when lifting off the accelerator unless you spent a lot of time and sent a lot of logs to ZZP it's going to happen.

The trims being what they are, shouldn't worry you too much (the -9 LFTF could use some cleanup). The LNF live adjusts fueling so nothing too terrible should happen.

If you want the trims to be in check better, start with a boost leak (not a smoke test, you need pressure at least 22psig) and then contact ZZP about updating your tune.

 

Cool thanks for the reassurance. Car runs smooth for 130k. Just trying to maintain it and have a lot of fun. Get a lot of compliments on how good it looks for its age.