LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

O2 Sensors keep going out!

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Old Jul 15, 2008 | 12:11 AM
  #16  
charliediss's Avatar
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From: Detroit, MI
Originally Posted by Injuneer
Have you checked for intermittent readings from the coolant temp sensor in the water pump housing? If the coolant temp indicates low enough, it will drop out of closed loop, and the PCM will start to richen the A/F mixture because it thinks the engine isn't warmed up.
No, I havnt checked the sensor reading from the coolant temp sensor yet, that will make it to the top of my list for things to check when I get home. I am also going to pick up a set of AC Delco O2s, anything else you can think of?
Old Jul 15, 2008 | 12:25 AM
  #17  
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Since you have long tubes, you probalby have extensions. Have you checked the extensions for a ground leak to the purple (or purple/white) signal wire? That would cause the O2's to read super lean, forcing the PCM to add fuel the engine doesn't need.
Old Jul 15, 2008 | 04:56 AM
  #18  
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Originally Posted by Injuneer
Since you have long tubes, you probalby have extensions. Have you checked the extensions for a ground leak to the purple (or purple/white) signal wire? That would cause the O2's to read super lean, forcing the PCM to add fuel the engine doesn't need.
That sounds very possible because even after I put new O2s in there, that bank smells rich, I guess that is also going to be an avenue of approach as I prep the car to hit the road once more. Thanks Fred, if you think of anything else, I would really appreciate the thought.

You have been a huge help

Charlie
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