stft at99.2%,p0300 code,changed 2 after cat sencers checked for air leaks-none,checked fuel pressure,new pluges&wires,both cats are hotter on outputs

Asked by Jan 20, 2015 at 01:08 PM about the Chevrolet Silverado 2500HD

Question type: Maintenance & Repair

code only comes on while on the move-off atslow or stop.changed maf,plugs&wires,b1-s2&b2-s2 have been changed.looked for air leaks atpcv...cleaned throttle

3 Answers

2,535

Did you Check Compression. Checked for Shorted or Opened Circuits on your Fuel System and Ignition System.

2,535

Make sure you run some fuel injector cleaner just in case the injectors are clogged!

found ground green-cut off end replaced end;then added an extra one. tomarrow will tell more.

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