December 18, 2009, 11:18 pm
[quote name='InstructorPiggy' post='52033' date='Dec 2 2009, 09:44 PM']sounds like fueling problem.
Try checking that the air flow sensor hasnt been refitted wrong way round (assuming they checked the air filter)
Check the air temp sensor while you are there, thinks it in the airbox/intake soon after filter, check connection/damage.
Also check the coolant temp sensor, ensure not damaged and still connected.
After that, gota look at Lambda sensors, throttle position sensor and fuel pressure.
Thanks Instructor piggy for the advice however we have checked all you suggested and couldn't find the fault. What else can you suggest? The mpg is now down to 21.7 from 27.5.