[Diy_efi] P0300 Random/Multiple Cylinder Missfire Detected

[Programmer]

Random missfires can be anything from EGR to fuel pressure problems. I can't
see it being the plug wires.
The system is accurate enough to know "which" cylinder is causing the
problem, and I can't see all the wires failing at once.

Lyndon

----- Original Message -----
From: "Matthew McCain" <mmccain at usaor.net>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, June 26, 2002 6:17 PM
Subject: [Diy_efi] P0300 Random/Multiple Cylinder Missfire Detected


> Hello,
>         I have a 2001 Chevy Blazer that has 30K miles on it.  I can feel
it
> missing slightly when going up hills. Only when the TCC is engaged, I know
> you will feel more of a miss then.  When I go up steep hills on the
> interstate the MIL will start to flash indicating a missfire is going on.
> Then sometimes it will stay on constantly.  It is under warenty with GM,
> They can not find a problem with it other than a P0300 code.  They gave
the
> ECM a firmware update, and it seemed to help for a while.  I have read on
> the net that for some reason the wires on a blazer need to be changed
every
> 30K miles to eliminate the problem.  I have inspected the wires and they
> look good.  I know sometimes you can't tell by looking at them.  It idles
> ok, and accelerates ok.  Any suggestions?  Thoughts?
>
> Thanks,
> Matt
>
>
>
>
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