ECM fault?

[Akselrud, Boris]

It has always been like that since I've got the car 3 years ago (it was made
in 1993).

I am very electronically/microprocessor inclined, however my experience with
engine mechanics/functionality is close to 0. It became better, though, over
these tree years that I am trying to battle this problem.

I replaced EGR valve with a new one at some point.

My brother says there are no vacuum leak, bad PCV valve and he has been an
auto mechanic since day 1. However I wish I could check it myself just to
make sure. I don't know how. I understand that looking for a vacuum leak
which can be anywhere is very difficult task. How do I check PCV valve?

Thanks for responding.


-----Original Message-----
From: David Cooley [mailto:n5xmt at bellsouth.net]
Sent: Tuesday, November 09, 1999 9:58 AM
To: gmecm at efi332.eng.ohio-state.edu
Subject: RE: ECM fault?


At 09:29 AM 11/9/1999 -0500, you wrote:
>O2 output does seem slow when you scope it. We did replace it, but I am not
>sure if it was genuine GM.
>Also I would imagine that right after the replacement while the sensor was
>brand new we should have felt at least some change in the idle character,
>but there was no change.
>That's why I am beginning to think that ECM program is causing it by
>reacting slowly or over/under compensating the sensor input. Do you think
>that it is possible? Of caurse if that's the case, I'll be stuck trying to
>reprogram it.

Did this suddenly start or has it done it since new?
Could be a leaky EGR valve, vacuum leak, bad PCV valve etc...
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