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  1. R

    Codes 172 and 136 still there

    Changing gasket Saturday I got a new Upper Intake gasket and EGR valve - going to change all on Saturday. The EGR was carboned up, though with tests it showed ok. Will change it anyway.
  2. R

    Codes 172 and 136 still there

    Codes still there I fixed the vacuum leak, engine runs as smooth as glass. After ten miles, light came back on and codes are there again. Checked for vacuum leaks, found none including on upper manifold surfaces. ????
  3. R

    Codes 172 and 136 still there

    Found It I found the leak. A really large 90 degree elbow was leaking bad. Did not show up the first time I checked for leaks.
  4. R

    Codes 172 and 136 still there

    Possible Vacuum Leak It is running worse when cold. I think the upper intake is leaking - I am going to test that after work. It also idles slightly high, my clue to intake leak.
  5. R

    Codes 172 and 136 still there

    172 and 136 codes Fuel pressure is good, no vacuum leaks. The engine runs good.
  6. R

    Codes 172 and 136 still there

    I have a 93 XLT. I had codes 172 and 136. I replaced both O2 sensors and cleared the codes. After about ten miles, the CEL came back on and the codes are back. Wiring looks good. I am looking for ideas.
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