Oxygen sensors...
+3
StalkerStang
Simcik
Remaggib
7 posters
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Re: Oxygen sensors...
The vacuum leak is your cause. Be sure you actually fixed it. If either end of that EGR tube is not sealed completely, you will have a vacuum leak.
The LTFT numbers are what I'm interested in and, as expected, they too confirm your lean condition. The "25" represents the maximum positive value that the PCM/ECU can adjust the trim. To have such a high number indicates that too much oxygen/not enough fuel is getting to the combustion chambers and the PCM/ECU cannot add anymore fuel to compensate. If it were a high negative number, the opposite would be the case, i.e. too rich. New EGR seals/gaskets are quite cheap. Replace them at both ends and recheck. It's highly unlikely that you found a vacuum leak AND there's still a problem. The sensors simply did their jobs and exposed the leak.
The LTFT numbers are what I'm interested in and, as expected, they too confirm your lean condition. The "25" represents the maximum positive value that the PCM/ECU can adjust the trim. To have such a high number indicates that too much oxygen/not enough fuel is getting to the combustion chambers and the PCM/ECU cannot add anymore fuel to compensate. If it were a high negative number, the opposite would be the case, i.e. too rich. New EGR seals/gaskets are quite cheap. Replace them at both ends and recheck. It's highly unlikely that you found a vacuum leak AND there's still a problem. The sensors simply did their jobs and exposed the leak.
TuxTshirt- Posts : 1121
Join date : 2012-02-14
Location : Pennsylvania
Re: Oxygen sensors...
Leave your battery disconnected for a bit too when you fix things, force the LT and ST trims to reset, hopefully it will fix it.
StalkerStang- Posts : 717
Join date : 2012-02-14
Age : 38
Location : Phx, Arizona
Re: Oxygen sensors...
Will do those things and let you know, thanks guys!
Remaggib- Posts : 759
Join date : 2012-02-18
Age : 42
Location : Wisconsin
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