RE: Playing in Pueblo

["Lawson, Dave" <dlawson@ball.com>]

Thanks for you input Orin.

>Did you hit the rev limiter?

I don't think so. At the start I was shifting around 5500-6000,
and then later I was shifting at 5000-5500. I might have though,
I do remember a couple of times exiting turn 9 where I noticed
a slight hesitation, nothing like the fuel pump being cut because
of excessive boost, but a slight stumble. I could have hit the
limiter on the H/T downshift from 4th to 3rd.

>I got a 2141 the other day after deliberately hitting the rev
>limiter.  The check engine light came on about an (uphill)
>mile later.

I have run the car against the rev limiter before, but not recently.

>Anyone seen the check engine light or pulled a 2141 after hitting
>the rev limiter?

Not yet. But I can test it out.

>The 2141 is almost certainly due to the ECU getting confused
>over which cylinder is firing.  It is listening for a quiet
>signal from cyl 1 or 5 and gets a real loud one from 2, 3 or 4
>and thinks there is knock when there isn't.

On both the ur-qs we were getting a zzzzzzing sound on rapid
acceleration, like 2nd or 3rd gear WOT. I was at first worried
that is was pinging, but we thnk we have it traced to the expansion
and movement of the exhaust system, we think it is rubbing on
the rear axle flange. It is a very audible sound, I wonder if it could
be transmitted back up through the exhaust/manifold/head and
fool the knock sensor?
 
>I'm also suspicious of the hall sender since this is what tells
>the ECU which cylinder it is on and there IS a bug in the MAC11
>related to the current cylinder if the hall sender is missed
>for more than 51 revs.

I will check over the dist and hall sender.  Is there an update to
the MAC11 s/w "available"?

Thanks again
-
Dave Lawson