[Gmecm] GMECM

[Darryl M Gilbert]

Hello: Wondering what kind of mufflers you have, are there any cats.
involved, or are they gone. the O2 sensor does not even work until it
gets hot enough to put the ECM in closed loop. So for the first couple
Minutes of operation things should be the same. I have true duals also,
no cats, O2 sensor only monitors driver side exhaust stream. Are you sure
you did not yank a vacuum line off accidently someplace???
Darryl...
On Thu, 03 Nov 2005 00:38:23 -0500 "lostrecep tion"
<lostreception at hotmail.com> writes:
> I currently have a 1990 Chevy G20 Van. With a V8 350 5.7l engine ECM 
> 1227747
> 
> its been running fine until i put dual exhaust on it now its not 
> running 
> well at all the idle is very rough at idle and also at slow speeds 
> (most 
> notably when its cold out)
> 
> Ive been told by my mecanic i can be a number of things but 02 
> sensors seem 
> to always come up as my ecu supports 1 o2 sensor and with dual 
> exhause i 
> should technically have 2 ? Right or wrong?
> 
> id like to possibly avoid doing a flash of the eeprom as im not 
> totaly 
> familiar with it and was hoping that someone may know of a solution 
> to fix 
> this problem . preferably not a real expensive one ive invested 
> quite alot 
> of money in this truck and really want it running well again
> 
> thanks very much for your help -Mike
> 
> 
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