Arctic2 Where is the map sensor located ?
td4 maf is pre-egr valve in the intake airflow system .. the maf sensor can't have a clue how much exhaust gas is being introduced via the egr valve
maf sensor voltage output .. determines how much fuel can be injected on go-pedal 'demand' without being over rich in mixture .. if maf be disconnected the ecu relies on an internal substitute maf mapping
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leeogt4 ..
make sure the egr valve .. if fitted .. is clean and doesn't stick ..
better still get rid of it altogether .. replace it with an egr delete/bypass unit
one thing less to go wrong and cause crap-engine-running issues ..
better mpg and go-pedal response without it ..
Would it cause it to smoke so much though?
The exception being if EGR is active. When EGR is active the reduction in airflow through the MAF sensor tells the ECU how much exhaust gas is being ingested. The ECU then modulates the EGR control valve to adjust the exhaust gas being ingested. The reduction in oxygenated air cools the combustion temperature to reduce Nox production.
it does at lower rpmSimple as that, the MAF sensor DOES NOT control fuelling on a diesel.
Have you thought about cleaning out the intercooler? It being clogged up could be the reason for your smoke.Ok so I've cleaned the maf sensor and the map sensor which was all clogged up with gunk and now it's pulling a lot better but still very smokey I did notice oil in the air intake pipes both sides of the maf so all cleaned out is there any oil breather pipes that could possibly blocked up on the engine? ?