normal for air pump to come off and on while driving?

**occamaroz** · 04-28-2006, 01:26 PM

It's on about 50% of the time. Car is a little low on power too.

***Ed Blown Vert*** · 04-28-2006, 01:56 PM

If I remember correctly, once it reaches a certain temp. It should not come on.

**SeVeReDiStOrTiOn** · 04-28-2006, 02:54 PM

Originally Posted by Ed Blown Vert

If I remember correctly, once it reaches a certain temp. It should not come on.

Originally Posted by occamaroz

It's on about 50% of the time. Car is a little low on power too.

You shure it's not the fan you're hearing? Did you adjust the on/off temps when you put in your predator tune? I know the basic performance tune does lower the on/off temps outta the box.

**occamaroz** · 04-29-2006, 08:26 AM

I don't run the predator tune because it worsens the par throttle pinging under a load.

**YoMommasTA** · 04-29-2006, 08:34 AM

i believe the air pump can come on if the computer sees the o2s are not responding properly.also under coast conditions.the air pump is used to get the cats and o2s hot as fast as possible to keep unburn hydros down.i had some trouble with a blocked air valve that caused car to run less than normal at slow speeds,poor response etc.i think the reason why was because the air system is used to test and calibrate the o2s.so if one side is partialy blocked and not getting enough air the computer may not see it that way and try to turn the air on to heat the o2 up.but if the oneway valve is partialy blocks it can't get enough air in the exhaust to get it hot.after i replaced the partially blocked valve the throttle response was very good again.the fuel mileage went up too.

i'm looking online to see if i can find a pdf that has all the air info.

**SeVeReDiStOrTiOn** · 04-29-2006, 09:23 AM

Originally Posted by occamaroz

I don't run the predator tune because it worsens the par throttle pinging under a load.

You running 91+ octane? You shouldn't get any pinging with the basic predator tune.

**occamaroz** · 04-29-2006, 01:14 PM

Originally Posted by SeVeReDiStOrTiOn

You running 91+ octane? You shouldn't get any pinging with the basic predator tune.

I do below 2k rpm only. Up to 12 degrees of kr. Stock programmed I still see 6 degrees kr. I just replaced the driverside air pump check valve and did the passenger side maybe 6 months ago. When the car runs low on power the exhaust pops alot upshifting compared to when it runs hard the exhaust doesn't pop. My fuel trims are fine part and wot throttle.