Question Answered: air suspension warning lights comes on after the first start.
February 16, 2012, 12:44 PM
You may have a leaking air shock, that sags over night. Every time you start the engine the air suspension does a self-test and the suspension pump runs to level out any of the shocks. If a shock sags too much because it is leaking air, then this will set a code and turn the air suspension light on for awhile.
Question Answered: what is causing a mysterious electrical problem?
February 16, 2012, 12:39 PM
This sounds like a weakened ground problem in your dash. When you operate different devices, they can not utilize their normal ground, so they cannibalize the ground from another device, which makes that device go 'wacky'.
Question Answered: Engine sometimes sputters on a hard downshift, what's the problem
February 16, 2012, 12:29 PM
There are about 4000 codes for this engine, so the best thing to do is to have a Pro level tech diagnose this hesitation problem, by scanning the engine/transmission computers while performing a test drive and duplicating the hesitation.
Question Answered: Slight rough idle. RPMs fluctuate 150± sometimes. Surges at highway speeds.
February 16, 2012, 11:49 AM
This could be so many things. How are your mode 6 readings? This is the scientific data for the OBD-II system, not just scan data. See if something is borderline, like fuel trim, misfire counts, EGR ( if equipped ) and yes air/vacuum leaks. How are your coils? And how old is the mass air flow sensor? Again, check your fuel long term fuel trim, It needed to be no more than 4-5% on either bank.
Question Answered: throttle position sensor
February 16, 2012, 11:43 AM
This car has 4 throttle position sensors, 2 on the throttle body and 2 on the gas pedal, so I need to know the exact code. For the most part, the sensors fail on the electronic throttle body, which typically means a new ETC unit or electronic throttle control throttle body assembly ( not cheap ) with some new software.