Not sure how you can expect an answer to that question when you haven't yet described the issue/symptoms.Better to leave the MAP seldom alone then. When I scan the car, it shows no trouble codes. I wonder if the issue is related to the spark plugs. The car has around 115k miles.
Correct, a diagnostic approach is always preferred and most often the less costly, but based on mdesjard's question whether his car uses an MAF or MAP it's my guess that he does not have the experience to do the type of diagnostics that you have suggested.Does your code reader show pending codes as well? How about freeze frame data? It's really hard to diagnose prior to a code unless it's pending or can be shown in freeze frames. The complexity of intake systems puts several culprits in the way - Crankshaft Position Sensor, Throttle Position Sensor (only it's not a TPS any longer, it's in the pedal assembly since it's an electronic throttle), MAP, variable valve timing and intake. I believe that any of those can create a pending code before they actually light up the CEL. Intermittent problems are the worse unless data is captured when it happens and you actually have something to show the shop.
