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Old 12-14-2018, 07:52 PM   #14
<Master Tech>
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Join Date: Nov 2002
Location: California

.9v, as mentioned, means stuck rich.

Try the measurement again on a hot engine and with the sensor unplugged. Measuring on the o2 sensor side. It makes it's own voltage.

Can't hurt to measure the resistance of each injector, disconnected. See if they are all similar.

Things that come to mind that would cause a rich condition would be torn FPR diaphragm, stuck open fuel injectors, bad computer, bad temp sensor, or bad MAF. About in that order.
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