"hachiroku" <Trueno@[EMAIL PROTECTED]
> wrote in message
news:YhGUj.1418$Vd.1020@[EMAIL PROTECTED]
> 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...
>
I responded to your e-mail about the EGR - check your in-box.
You check the mixture by looking at the HC numbers on your emissions test.
I don't remember all of the numbers you posted, but I don't think the
mixture is too lean.
I have never seen a va**** lock on a fuel-injected Toyota because the
higher
pressure from the electric pump keeps the fuel in its liquid state while
it
is in the fuel line.
It is possible that your injectors are a little fouled, try some Chevron
Techron, exercise the engine, and see if it clears up. If you can find a
shop that has Motor-Vac, I've heard good things about it, from my buddy
the
Ford master tech and from MDT Tech.
Good luck!
--
Ray O
(correct punctuation to reply)
|
