Engine Performance problem
2003 Chevy Suburban V8 Four Wheel Drive Automatic 80009 miles
Im Having Lean Codes set on my Suburban, I have changed the MAF sensor as it intermittantly sets this code aswell. I have checked the wiring to the MAF and it has the battery voltage as asked for through Mitchell, I have checked for vacuum leaks at the intake, all vacuum hoses and the intake boot both with brake cleaner and with propane, I have cleaned the fuel Injectors with Champion cleaner introduced into the fuel rails, I have monitored the 02 sensors and they are fluctuating from mid 30mv to 800mv and reacting fast, The fuel trim levels at idle are long term 25% and short term 56.1% off idle they do adjust and at cruise long term go to 14.8%
the Alcohol content is 7% normally and in the freeze frame it shows 0%.
In the freeze frame data I get when the code sets I am concerned with one data aspect that says " commanded gear 6" and when I look at the T.O.S.S it is well above 4000 or 5000 rpm.
I also checked the battery terminals and they were dirty but I have since cleaned them and still am having the problem. I have the entire freeze fram peramiters when the codes set if you want them all I can Give them to you.
Thanks for the help
Tuesday, December 16th, 2008 AT 11:57 AM