Quote:
Originally Posted by danielsatur
Because of the Age + mileage of this car, the wear tear on valve stem seals are going to leak oil, and throwing all the PCV, and EGR gases back into the intake. The feedback from the O2 sensor will just confuse the ECU for the Air/fuel mix control.
Your symptoms of a cold hard start and hesitates, tells me your MAF sensor is bad, or contaminated, because of poor emissions.
You don't see this stuff on race cars!
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I don't deny that the valve stem seals are probably worn and that the oil can contaminate the O2 sensors and cats, but the MAF sensor is nowhere near the exhaust system. Only clean, filtered air goes past the MAF sensor. It may be dirty from other fine contaminants. Get some CRC MAF Cleaner from your local parts store, spray it on the MAF sensor wire, and let it dry. Pull the negative cable from the battery for 15+ minutes to reset the PCM's learned fuel trims and drive around a bit for it to relearn.
Since it's hard to start when cold it's probably due to the valve stem seals letting the compression leak just enough to make it hard to start. Do a dry compression test on the cylinders.