Quote:
Originally Posted by overtureZ
Possibly look into doing a PCV delete/catch can system.
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I added a catch can... but I did not delete the PCV.
Quote:
Originally Posted by overtureZ
Question, When you have the idle surge, does your vacuum flutter, and do you run rich?
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When i notice idle surge, 80% of the time I get the p0507 ISC. The fuel trims are increasing... so i actually have a lean condition. From my cheapo logger (NDS or Torque Pro) I see STFT's increase when the fans kick on.
Unfortunately, I still have not found time to rip the front bumper off.
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Diagnosing with Fuel Trims
Fuel trim can be a valuable diagnostic tool - Eastern Manufacturing
Fuel trims can help you zero in on the problem, especially when there are no other trouble codes present. Knowing whether a vehicle is running too rich or too lean will help narrow down your diagnosis. Fuel trims that differ greatly from one cylinder bank to the other will also point you in the right direction. Always evaluate fuel trims at idle and at 2500 RPM.
Running too rich – High negative fuel trim corrections can be caused by MAF sensor problems, high fuel pressure, leaking fuel pressure regulator diaphragm, faulty evaporative emissions components, leaking injectors, defective O2 sensors, exhaust leaks/pinholes before the O2 sensor, coolant temp sensor problems, and base engine issues such as low compression and incorrect camshaft timing.
Running too lean – High positive fuel corrections can be traced to MAF and O2 sensor faults, vacuum leaks from intake gaskets/hoses, unmetered air (intake snorkel leak), clogged or dirty fuel injectors, fuel delivery issues, and exhaust restrictions such as a clogged catalytic converter.