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  1. My fuel pressure is around 11 during prime and 12...

    My fuel pressure is around 11 during prime and 12 while running.
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    What does this clue point to?

    95 K2500 HD 5.7 TBI. Runs great.

    I have been logging a slightly high BLM of 140-144. But noticed two things today that hopefully one of you folks will recognize as a clue.

    1) At fully warmed...
  3. Normal to have a "Desired AFR" of 13.9-14.1 ?

    In my log the Desired AFR is around 13.8-14.1 for the entire trip. Is this normal? I thought after warmup it mostly sought 14.7? Are these tuned rich or is it adjusting to this number (although it...
  4. Nice catch - Rockauto says that part 10456288...

    Nice catch -

    Rockauto says that part 10456288 is correct for my truck without saying whether its manual or Auto.

    When I go to GMpartsdirect 10456288 is for "Manual trans. Thm 700-r4/4l60"...
  5. So thats interesting. Does the ECM assume 10%? ...

    So thats interesting. Does the ECM assume 10%? What happens if I use non-ethenol when it's expecting 10%? Could that contribute to knock counts?

    Or does it not assume anything and can calculate...
  6. I don't hear anything at all. I don't believe...

    I don't hear anything at all. I don't believe the sensor has ever been changed. Do they go bad in the direction of false knock?
  7. Thanks Gary - Not sure how to check the sensor to...

    Thanks Gary - Not sure how to check the sensor to determine if it is giving false knock? The only thing ive seen is to tap to see if it registers. Any advise on how to check to see if it's over...
  8. What should the Desired AFR range normally be in mellow country road cruise?

    I am new to data logging and am trying to chase down high knock counts on my 95 K2500 5.7 TBI all stock. It starts, idles and runs very well. I was surprised to see very high knock counts (over...
  9. It seems like the O2 continues to go up and down...

    It seems like the O2 continues to go up and down like normal. Doesn't swing and stay more lean-ish. It really feels like it's engine "load". I drove home with a heavy load in back today and got...
  10. Thank you for the thoughts. I do think they are...

    Thank you for the thoughts. I do think they are real. I checked and they almost always occur when the MAP starts going up.

    The question is why? I get one possibility is carbon although I...
  11. Thanks for responding. However this does not fit...

    Thanks for responding. However this does not fit my symptoms. In my case it appears to be a true case of Knocks. Counts go up by a few hundred, retard goes on a few degrees for a few seconds and...
  12. 1st data log (OBD1) and went 7000 Knock count! Any advise appreciated - log attached

    I am new to tuning/logging so could use some advice as I don't know what the values for most settings are supposed to be so can't tell what clues are being given in this data log. I had to just take...
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