Miata Mailing List: October 1997, Message #53
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From: 	"Frank Mowry" <fmowry@ngs.noaa.gov>

Subject: Re: 96+ owners/chargers

Date: 	Wed, 1 Oct 1997 08:06:05 +0000



>Who is installing the system?  Pick their brain, 'specially if you're 

>at BEGI...  over on "the other" list (BEIG list) there is talk of 

>OBDII cars using EGR pressure data (as well as having two other 

>sensors pre-OBDII cars don't have) to determine fuel maps, which gets 

>hosed (no pun) when you boost the engine.  Why the ECU starts 

>ignoring the 02 sensors, even when an aftermarket A/F meter shows 

>full lean is beyond the grasp of those of us participating in the 

>conversation.





So how does the EGR work on the Miata.  Doesn't it close at WOT?  If so,

wouldn't this give it a constant pressure, eliminating any effect on the

determination of the fuel maps at least at WOT?  Also are you sure that the

full lean isn't an indication of the limitations of the fuel system,

pump/injectors/regulator as opposed to the ECUs handling of fuel maps?  Has

anyone attached a fuel pressure gauge to a boosted OBDII Miata?



Frank Mowry