.........me I needed a new EGR, and trottle body. Had multiple mass air flow codes, which they thought were from the egr. Kinda looking for ideas or thoughts on it.
Any chance you have a record of those mass air codes? It seems that EGR, or Throttle Body, concerns are, IMO, "shots in the dark". My reasoning is that if the words "Mass Air" are present in the codes presented, that should relate to the PCM (computer) being unable to obtain satisfactory info on the
amount, i.e. the mass, of air entering the engine.
While both the EGR and Throttle Body systems control the amount of air being used by the engine, they have no function attached to them to actually
measure it.
As far as replacing the Throttle Body goes, that's far-fetched, again my opinion only here, but the throttle body is nothing more than a variable obstruction to air flow, just like the plates in a carburetor, and therefore the Throttle Body does nothing more than control the amount of air the engine can "suck in", thereby controlling it's power output. If the T.B. were
cracked, jamming or binding, then replacing it would be in order.
The EGR Valve's movement is monitored by it's own position sensor, which tells the PCM whether it is moving, sticking, stuck open, or stuck closed. Since the EGR valve allows relatively "dirty" air (exhaust gases) to flow back into the engine to be "re-burned", it often gets gunked up in service due to the heat and such. That's why they chose to monitor it's movement. EGR failure generates it's own set of DTCs (trouble codes), unrelated to Mass-Air codes.
Now, let's hear some dissention from the "ranks"! imp
Sarge
