I am in the process of trying to pass emissions with my 93 Rx7, I am thinking if I turn off the boost and turn on the airpump it should pass.

When My car is at idle the airpump does not engage.
When does the airpump engage?
Do I have a faulty connector?
How can I make sure the airpump is on when I go for emissions?


How do I turn off the boost? I assuming I have to make a temporary mod on the vacuum diagram.

I am running full stock vacuum lines with all the actuators, downpipe, Greddy Exahust. 96 Jspec engine and turbos

Thanks

 

The airpump magnetic clutch is engaged until 3250 rpms. Have you checked the airpump relay?

 

I was thinking about making a down pipe just for emissions.

Basically you would disconnect the intercooler & piping, throw a filter on the Throttle body, and make a cross over pipe that recirculated from the turbo's cold side into the down pipe.

making your turbo/ turbos your air pump.

like I said, this would be for emissions only...

but its probably more of a pain in the *** than its worth.

 

You can also unplug the hose that feeds the cat with air and see if it's blowing air or not (that's fairly easy to do).

When you find why it's not working you can also bypass the relay so it's enabled the whole rpm range.

 

So at idle if I rev it to 3250 rpms it should engage?

 

The air pump is engaged aka it is running up until 3250 rpms. If you rev it to 3250 rpms it should shut off at that point.

 

well my airpump does not even turn on, where can i start looking, is their a relay somewhere?

 

fsm

 

Quite true.

The relay is located in the fuse/relay box at the very front of the car (you'll need to remove the intake cover at the center - it's just 2 10mm bolts).

You should hear the relay clicking when going Key on.

 

Interesting!

My car passed the idle without any issue. It took several tries to get it to pass the road/dyno test. I wonder if I had bypassed the relay if the extra air flow would have been enough to dilute the air mixture.

Has anyone tried this before? When I passed I was literally 1ppm away from the line. So if this little trick would allow me to squeak out a few ppm that would be great!

 

What constituents did you fail on?

The air pump trick should help you reduce HC & CO (as it will bring the catalytic converter A/F ratio closer to stoichiometry) but not NOx.