Air Pump Vs A/f Meter
03-21-2003, 07:02 PM
#1
Junior Member
Thread Starter
Join Date: Dec 2002
Posts: 9
Hi
Please can someone enlighten me.
I have a homemade a/f meter with 10 leds. 3 green (rich), 4 yellow (stoic), and 3 red (rich).
While cruising in 4th gear at 35mph ( approx 2000rpm ) my meter will be flicking between red & yellow
but then I can hear what sounds like the air pump coming on and my meter flicks to the first green led.
In my case that is the 'power led' the one the lights under WOT.
The pump can stay on a while unless you take your foot off the gas, it will then go full lean but the cycle then repeats.
Cruising at higher speeds, approx above 45mph this doen't seem to happen.
Is this behaviour normal for the air pump ??
Thanks
Puppetman..
PS> As seen in other posts, my a/f meter reads steady first green led at idle.
Please can someone enlighten me.
I have a homemade a/f meter with 10 leds. 3 green (rich), 4 yellow (stoic), and 3 red (rich).
While cruising in 4th gear at 35mph ( approx 2000rpm ) my meter will be flicking between red & yellow
but then I can hear what sounds like the air pump coming on and my meter flicks to the first green led.
In my case that is the 'power led' the one the lights under WOT.
The pump can stay on a while unless you take your foot off the gas, it will then go full lean but the cycle then repeats.
Cruising at higher speeds, approx above 45mph this doen't seem to happen.
Is this behaviour normal for the air pump ??
Thanks
Puppetman..
PS> As seen in other posts, my a/f meter reads steady first green led at idle.
03-22-2003, 08:32 PM
#5
Senior Member
Join Date: Sep 2002
Location: jackson, ms
Posts: 1,305
the air pump is a clutch style pulley/tensioner, and under specific load [>~4K rpm] is not used, or useless, or should i say, non funcitonal.......it disengages and just free spins.....so therefore it is not doing anything above say, 4500 rpm.....it is solely for emissions and what not.....
03-23-2003, 03:54 PM
#7
Member
Join Date: Aug 2002
Posts: 65
Yep. When I took off my air pump my car ran so rich at idle that it surged badly and fouled plugs if left at idle for too long. After pulling some fuel out down low it was fine. So because you haven't got an adjustable ECU, I wouldn't advise you rip off the pump.
03-23-2003, 10:11 PM
#8
Senior Member
Join Date: Oct 2002
Location: Merrick NY / St.John's Uni Jamacia, NY
Posts: 1,073
i had the same problem when i took off my pump. I have a PFC now (it has the setting for removed or disabled airpump) so i dont get the idle problems anymore. only thing im worried about is my main cat clogging up in a few months, eh that will be my excuse for open exaust..... i still need catback though.... damn im sad. 
blargh anyway if u remove ur airpump be sure to cap off the two pipe ends coming from buhind the intake manifold or else ull hear a loud annoying noise hard to explain but it goes away once plugged up.
ps it makes the engine bay look a lot roomier plus u can see ur turbos from above the car
-mike
blargh anyway if u remove ur airpump be sure to cap off the two pipe ends coming from buhind the intake manifold or else ull hear a loud annoying noise hard to explain but it goes away once plugged up.
ps it makes the engine bay look a lot roomier plus u can see ur turbos from above the car
-mike
03-24-2003, 05:03 PM
#10
Senior Member
Join Date: Oct 2002
Location: Merrick NY / St.John's Uni Jamacia, NY
Posts: 1,073
its in one of the settings, u look and it says O2 pump or something and select the japanese symbol next to it and change it (all the symbols look the same for "on" change it so it is diff "off"
ill take a pic of the screen and get ack to u with the exacts in a few
mike
ill take a pic of the screen and get ack to u with the exacts in a few
mike