sierrafery
Well-Known Member
Itr's high but depends on the outside temp and how clean your intercooler is... the IAT can go from ambient air temp + 10 to max 30*C depending on outside temp, engine coolant temp and boost(meaured when the coolant gauge is at middle)...also it can be higher if EGR(especially non-cooled EGR) is still fitted.
as long as at cold start in the morning is very close to the outside temp at idle the sensor might not be the problem
as long as at cold start in the morning is very close to the outside temp at idle the sensor might not be the problem
sierrafery
Well-Known Member
i say again with warm engine is over ambient +10 to 30+ so that 46 can be correct if there were 16* outside if you see what i mean
sierrafery
Well-Known Member
if at first start in the morning with cold engine was 10*C difference it's not good, they should be quite the same, at 21 outside with high boost 46 is not excessive but the intercooler can be great help, clean the MAP/IAT sensor and check at first start and if there's more than 2-3*C difference in the first minutes then IMO better change the MAP/IAT sensor... the intercooler should be flushed at least once at 50K miles(they say 24 months or 48K miles in the maintainance sheet)
MJI
Well-Known Member
Tahnks will check before work, but those are not cheap sensors!
sierrafery
Well-Known Member
no they're not and aftermarket can give you erratic readings, it's like in the MAF's situation, only OE is reliable, but bad readings from that sensor can mix up bad the whole management, accurate MAP and IAT readings are very important for the addaptive strategy
sierrafery
Well-Known Member
Then IMO the sensor and the reading is good, you'll need only to flush the intercooler if it wasnt done lately
