Quote:
Originally Posted by jaimster
right on Blue62!
I have tested the FPR good - after removing the vacuum hose pressure went up t0 60 PSI
have not replaced seal on Oil fill tube cap - did not see any smoke coming out of there on my last SMOKE TEST ..
how to test Evap purge valve ?
had the car running for almost half hour now TOO hot for smoke test - SMOKE TEST TOMORROW with engine COLD should be smoke coming out of the exhaust if there is a leak !!
so this is what I observed today after car warm up "
MAF a/c off 3.25 a/c on 4.0 g/s
while car was running disconnected MAF sensor SOMEBODY HELP ME UNDERSTAND THIS
after disconnecting MAF car hesitated a bit almost not noticeable CAR KEPT RUNNING
numbers on old BOSH sensor are 0280 218 055 986.606.125.01
0280 218 055 986.606.125.02 on new BOSH sensor only difference last 2 numbers 02
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In simple terms:
The Maf sensor is two sensors in one.
It senses Intake Air Temp. and Intake Air Mass.
From those two things the DME knows how long to pulse the Fuel Injectors thus creating the correct fuel air mixture. (all other things being correct).
When you disconnect the MAF sensor the system reverts to a preset default fueling strategy. That fueling strategy is derived from a fueling Map or table that is largely driven by the parameters of engine RPM and Engine load.
So if you disconnect the MAF with the engine running it takes a second for the system to change or adapt to the default fueling strategy.
That is my current understanding of how it works.
Your looking for a "Voltage Spec." at the MAF Sensor.
Key on engine off your looking for 0.9V - 1.1V
Engine running at idle approx. 1.4V