Quote:Is it also odd that a code hasn't been set?
Not odd at all....
Quote:Any quick fixes?
On iatn, you'll probably get 30 quick fixes. Its just a matter of picking the right one.
Quote:I asked my instructor and...
At the risk of unintentionally offending you, I'm guessing this means your fairly new to the field. In which case I know its a tough road your facing.
One thing you have to keep in mind. Today instructors/educators tend to speak in terms of system operation in a "the computer monitors and sees such and such. Therefore, when this happens, the computer does this and that".
The problem is, older vehicles were equipped with technology far below todays and therefore much of the system programming only works as it should if current events/signals fall within certain "windows".
My comment above about it not being odd that a code hasn't set would also apply to much newer vehicles with much greater onboard diagnostic capabilities.
If there is no stored code, then other than an educated guess, you've got your work cut out for you. The absolute worst scenario is when the calibrators could not forsee a given fuel characteristic for a given situation and there is not yet a new calibration (or in some asian vehicles) or a new pcm to address the problem. Been there done that too many times...
I think though, the basics have already been mentioned. Throttle body coking, dripping fuel injectors, leaking regulator, fuel quality, etc...