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Engine idle hunting and Check engine light came on. .codes codes 1128 and 1130. Drove

  • 2002
  • Boxster
Mileage: 
65 000
Fuel System
Gaithersburg, 
Maryland

Check engine light came on. Due for 60 K service. Took to my Indy mechanic. Replaced plugs, coils, engine air filter cabin filter, flushd brake and clutch fluid. Replaced engine mount and reset codes. Codes 1128 and 1130. Drove home, car began to idle hunt and check engine light came back on. Took back replaced air mass meter. Drove engine light came on same codes. Took back replaced breather air oil separator and spark plug tubes. Drove engine light came on, same codes.Took back replaced vapor canister vent and gas cap. Drove check engine light came on same codes. Took back replaced fuel pump, tank sender, and regulator. Drove check engine light came on, same codes. Additionally mechanic did smoke test no air leaks. Replaced 02 sensors with borrowed functioning 02 sensors. Check engine light came back on the same codes. Issues remain. Idle hunting after cars warm. RPM drops from about 7-800 RPM to three or 400 RPM and then catches itself. After RPM drops check engine light comes on.

My Mechanic is stumped. I would greatly appreciate any ideas or recommendations.

Jack Roth

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