Date registered: Jan 2006
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RE: sensor questions (MAF, IAT, O2, etc)
the oil on the intake manifold and MAF could be a cause of crankshaft ventilation bringing up the blowby gases mostly by unburned gasoline (HC) and some products of combustion that get past the piston rings and into the crankcase. cleaning the intake manifold, throttle valve, MAF, etc. is reasonable enough. be sure the crank shaft ventilation will be cleaned as well. also, try to check the oil pressure sensor connector that is caused by an internal leak on the sensor. this will send oil to the ECU and spreading it to various components like the MAF, O2 sensors, etc. oil contaminated ECU will damage the solid state devices obviously and with that case a new ECU is in order. i cant suggest to replace the MAF or O2 sensors without checking it. there are scanners that can read the responses of the O2 sensor using the oscillograph. if the ECU is oil contaminated am quite sure the O2 sensor is contaminated too. clean it and observe the engine. goodluck.