ANY????1 out there who can OFFER ""KNOWN**possible remedy(s) ????......2cats HAVE been REPLACED!!!!plus half dozen other THINGS that were suggested by ALLEGED mechanics!!!....will put it on EBAY auction if **PROBLEM**can't be RESOLVED....will SINCERELY appreciate hearing from any of U out there...car has 99,000ORIGINAL miles with like-new OIL-PRESSURE etc/etc and PERFORMS((xcept for a very MINOR **MISS**(???), as NEW... as when purchased over16 years ago....also, JUST had the INJECTORS professionally cleaned etc.....ANY helpful suggestions WILL be GREATLY appreciated!!!!RAY B.//old RX7 guy<raybdel@yahoo.com> 10/15/02 PM. END.<<<<<<<<<<<<<<<<<<<<<<<<<<<<<...

 

have you replaced the O2 sensor?

right on.

 

if it was only carbed....

j/k

 

Worst case scenario, you can adjust the mixture. There is a screw over on the passenger side engine compartment wall. It is a small black housing with a screw in it. It has two letters, R and L. I will let you guess what they mean. Just be careful and not lean it out too much. The manual suggests that you don't touch it.
hanman

 

Not too sure about 7's (first EFI's), but on every other EFI there are 2 causes of richness. Either your O2 sensor is out or your mass flow sensor is out.

Air cleaner?

You nitrogen and hydro's should go opposite. If your hydro's are high, then your nitro's should be low and vice versa. The first thing any real mechanic does that works smog is check your 02 sensor and air sensor.

The 02 sensor tells the EFI how to mix (rich or lean) and the air sensor tells the EFI how much air is going in. The EFI then calculates and adjusts the fuel ratio to get the desired level.

 

>>>>>>>>>>>>>REPLY 10/16AM>>>>>>>>>>>>>>>>>>>>THAT **R/L-rich<-->lean WAS "factory-SET"...at about 35degrees....MANUAL(which I've had 4 16 years) says ((accoding to MAZDA)) **only to be ADJUSTED by MAZDA dealer**....""moving/adjusting the SCREW is a sequential PART of a MAJOR tune-up""...my R/L **DOES** work!!!! THANX!!! 4 your post <<<<<<<<<<<<raybdel@yahoo.com>>>10/16 AM<<<<<<<<<<<<<<<<<<<<<<end.

 

>>>>>>>>>>>>>>>>>>REPLY 10/16 AM>>>>>>>>>>>""SPIEDER""::**BOTH**the MASS-FLOW-SENSOR and the O2 sensor HAVE been REPLACED!!!! ....HOWEVER,,the WIRING etc. BETWEEN all these DEVICES was NOT checked 4 continuity etc.etc....I'm going to MAZDA this week and ATTEMPT to buy the CORRECT -NEW O2 Sensor..AND a NEW **FUEL_FILTER**.....DON'T recall RENEWING the FILTER during the last 30K miles!!!! NEVER had an **automobile** ''STUMP"" me over the last 45 YEARS!!!! WON'T give-up !!!!! at least,, NOT yet!!!!!!!!!!!!!!!<<<<<<<<<<<<<<<<raybdel@yahoo.co m>>10/16AM.

 

are you communicating by telegrams?

 

>>>>>>>>>>>>>NO....just VIA the BEST mail server,, YAHOO RAY B. 10/16

 

timming? possibility (not up on the fi scene)

peace

 

Test or replace the ACV (air control Valve). I'm betting 25 cents on it!

 

See this post
https://www.rx7club.com/forum/showth...light=Emission

The way I rigged up the air pump to the cats was by taking heater hose (it's roughly the same size) and running a peice from the air pump output to the inlet of the split air pipe.

And as always do the usuals.
Clean spark plugs
Change the oil
Take it for a 10-15mins high rev run before you get it tested to warm those cats up nice and hot (they work better)

Hope this helps.

 

>>>>>>>>>>>>>"badRX7":::ON what YEAR '7' did you perform your ""HEATER-HOSE" modification????84??85'??? ANY problems((emissions-wise)) SINCE your MODIFICATION????? PLEASE get BACK. RAY Burns <raybdel@yahoo.com> 10/17/ AM END.

 

I did it on my 85 GSL-SE. and right after the test, I put it back to the way it was supposed to be. Our cars run rich at idle, that's the way they are designed. I ran it for a day with the rigged up setup. The one cat got a little red from all the added oxygen, but it helped me pass! I had the exact same setup w/one of the cats being brand new, and my numbers where about double the limit and I even took the oil metering pump off to clean up the exhaust (the time I failed). So this little trick helped me pass and save a few bucks.