Idle Tables \ VSS screw-up

CSH-HQ nacelp at jvlnet.com
Fri Aug 13 13:56:07 GMT 1999


Those areas are for fuel Type corrections, like if running hi alky content 
or for export cars.  Longer post in archives
Bruce

>Carl Summers wrote:
>> 
>> Hi Jason,
>>        Some engines don't seem to like the 14.7:1 afr bit since it also
>> involves the o2 switching....generally the engine will also see higher
>> afr's.....If you have larger pipes or bad placement of the o2 sensor it
>> will slow the switching rate...partly because the sensor cools down.....If
>> you don't already have a heated o2 sensor you might try doing that.....It
>> has worked for me in the past when I have run into this...hth's
>> -Carl Summers
>
>Carl,
>	I guess I should have mentioned that I am using a heated O2 sensor and
>it is about 8 inches from the exhaust port (shorty style header) The
>thing goes into closed loop really quick so that kinda rules that out.
>
>As for the 14.7 AFR bit 0x2aa is what I assume you were referring to, I
>had some strange results when changing this bit, it started with a value
>of 147, well I bumped it down to 137 what I thought would be a richer
>mixture. well this caused the BLM and INT values to drop taking away
>pulse width, I thought this was strange so I went and changed it to 157
>this time I thought it would be leaning the mixture out but it again did
>the exact opposite it made the BLM and INT values increase.  So this
>leads me to believe that the value being 147 is just coincidence 147
>doesn't necessarily mean 14.7:1 AFR,  Am I way off on this or what?
>
>Jason
>




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