On Wed, 07 May 2008 20:43:03 -0500, Ray O wrote:
>> Now, I can't remember...to reduce NOx, do you Advance the timing, or
>> Retard it? Last summer I set the timing dead nuts on spec, and then
>> played with it slightly to get the car running smooth and get a little
>> OOMPH out of it, only a degree or so one way or the other.
>>
>> Now, about the roof. I havent been driving with the roof on much, so I
>> suppose this isn't helping, either. But it just seems I wasn't putting
>> this much gas in it the past 3 years...
>>
> High NOx comes from high combustion chamber temperatures, which can be
> the result of insufficient EGR flow, over-advanced timing, or lean
> mixture.
Guess I'll start by resetting the timing to stock. However, I checked the
timing when I got the car, and it was at factory spec, and the NOx was
high then, too.
The EGR is easy enough to check; how do I check lean mixture? Tracking
this down may also help with my va****-locking problem, too...
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