I am just getting started on an 87 TII Rx and I have a few Questions. I purchased the car about 1 year ago and the only thing I've done so far is an aftermarket intake. Everything is pretty new to me. I have basic automotive knowledge but I have no Rotary experience. The car idles fairly rough and refuses to start when warm. I recently took it in for emissions and it is running extremely rich, almost 5 times the allow level on a number of emissions. I was told this could possibly be an injection problem. I have already replaced the O2 sensor and the temp sensor located behind the water pump. I don't know if anything has been messed with except the idle. I did the jumperwire deal to try to bring it down because it was at around 1500 RPM> It was also running at 2300 RPM when first started. I am hoping the collective knowledge of the site can help me out Thanks.

 

check your AFM and your TPS. Both can cause this.

 

How do I check these? The TPS is fairly easy to adjust. I'm not sure what the AFM is. Which way do I go on the TPS nut?

 

Do a search for info on how to adjust the TPS. You need either a meter or 2 test lights to do it. I can't remember off the top of my head what the readings should be. The AFM is on your airbox right where the hose comes out to the turbo. This can't be adjusted, so if it turns out to be bad, you need to replace it.

 

Thanks. I'll give it a try. What does the AFM do?

 

The AFM is the Air Flow Meter its also called the MAFS(Mass Air Flow Sensor).Mine recently went on me and i was told a new one is like $1,200 so I looked for a used one which was $60 shipped and it had 60,000 miles on it.There is one in the for sale section for cheap and its for a S4 I believe.The AFM is the part that conects to your air filter.Do you ever have to push on the gas to get it started when its warmed up?

 

I don't know if it helped or not but I have tried everything. If I only let it crank for a second it seems to start better than if I keep cranking. Any other ideas on the emission problem? Could it be a bad injector?