KZ1

Well I just removed my airpump. I did it so that I could run the greddy pulley kit. What adjustments shoudl I do. I haev heard Chuck mention turning the o2 sensor control off. Is this was eveyone is doing? or are you just elving it on.

the car idles a little rougher than normal. Also, for the two pipes what sould I do with them? right now I haev them both pen to the air. I tried to plug them but the car absolutely idled like ****. I still haev the ACV and evything intacted, and the apump conector is dangling in engine bay

now I am wishing I polished the bottom half of y-pipe since I can see it now.

cheers guys, oh BTW, when I had the ACV blocked and o2 off, I hit 95 knock, under boost at around 3k rpm. I usually never see about 65.

Cheers

cewrx7r1

iTrader: (2)

With my air pump disconnected for O2 AFR testing, my engine idles smoother with the O2 idle control still on. But is runs a little smoother under light load at low rpms with it turned off. Either way, mine idles very well with the pump disconnected.

I did discover that mine idles smoother with the hose that goes from the "Y" pipe to the bottom of the intake manifold, left connected. With it off or plugged my idle is worse. This hose supplies air to the primary
injectors air bleed sockets. This helps to push and atomize the gas into the primary intakes at idle when the air velocity is low. It should help large port engines even more than stock port as they have even less air velocity.

KZ1

so what should I do with the 2 pipes that are left from airpump? Robinette says to plug them, but when I do that it idles even worse. SHould I reset the PFC and let it learn again?

Thanks

cewrx7r1

iTrader: (2)

If yours idles better with them unplugged, it propably means that the exhaust is actually sucking air through the inlet pipe into the exhaust manifold. This causes a leaner AFR at the O2 sensor which is closer to the normal operation of the system.

I bet that if you only plug the discharge pipe, the idle will not change.
Determine which one is allowing air to inter and leave it open but also place a small K&N filter on it to prevent dirt ingestion. Some shops carry the mini filters for crankcase venting.

KZ1

you are right about he discharge pipe. I want my idle perfect, does it make sense then to plug them both an dmake the manual map correctiosn to the PFC and disable o2 correction?

adax

iTrader: (2)

I've removed and blocked off the ACV which effectively removes the pipes you are talking about. Can't say that I've noticed much difference in idle, I still have O2 enabled even though most believe that the sensor is not used for idle with the stock ECU. Sounds like the PFC may use it though. I occasionally get wild idle fluctuations when coming to a stop when the engine is not quite warm but that seems to be resolving over time.

Alan