02-08-2018, 09:06 AM
ok, High NOX.
engine misfire hot at idle? not good.
the pushing gas pedal in A.M start ups means its staving for air.
the IAC is not open. is my guess. for cold starts. In fact the ECu assumes it is open and injects cranked based on the modeling of IAC open.
or its over injecting (ECT reads wrong (too high ohms) and overfuels and you need even more air to start engine.
so is fuel pressure at spec.? at ide and at WOT , (gunned pressure increases about 6 PSI from idle.)
Make sure the MAF is clean (from 8' afar clean it with cleaner spray)
injectors not leaking,
oddly....
nox happens the most the better the combustion, nox is by product of too much heat (and max power) in the combustion chamber, all normal and is why they inject EGR gasses to cool it down a bit the the remainder is via the 3 way CAT removing the NOX last.
but if car misfires, nox is less. (so must be only some conditions NOX happens, speeds and load,)
so there are 2 problem so solve.
it seems
I can assume tuned up, spark ,wires ,cap rotor and fuel &air filter, less that say 30k ago.
Id check fuel pressure first if not already done.
The FPR on this car is too old now if original.
engine misfire hot at idle? not good.
the pushing gas pedal in A.M start ups means its staving for air.
the IAC is not open. is my guess. for cold starts. In fact the ECu assumes it is open and injects cranked based on the modeling of IAC open.
or its over injecting (ECT reads wrong (too high ohms) and overfuels and you need even more air to start engine.
so is fuel pressure at spec.? at ide and at WOT , (gunned pressure increases about 6 PSI from idle.)
Make sure the MAF is clean (from 8' afar clean it with cleaner spray)
injectors not leaking,
oddly....
nox happens the most the better the combustion, nox is by product of too much heat (and max power) in the combustion chamber, all normal and is why they inject EGR gasses to cool it down a bit the the remainder is via the 3 way CAT removing the NOX last.
but if car misfires, nox is less. (so must be only some conditions NOX happens, speeds and load,)
so there are 2 problem so solve.
it seems
I can assume tuned up, spark ,wires ,cap rotor and fuel &air filter, less that say 30k ago.
Id check fuel pressure first if not already done.
The FPR on this car is too old now if original.
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