ok, I've read most of the threads that contain the p1151 cel. My car is a '98 SE, Mtx, 2.5, 169K.
I just replaced the engine and don't know if this motor was throwing codes in the previous car. Anyway, it runs smooth, although the idle is a little slow in coming down, compared to previous 2.5s.
So after installing the motor i get the p1151 code. I checked for vacuum leaks by the carb cleaner method with no hint of a leak. I used up more than half a can of the spray stuff in the process.
I then changed out the upstream o2 sensor with one i had...p1151 after a few miles. Datastream gives me a reading on the sensor, although i don't know exactly how to interpret the voltage readings, other than they appear high, like closer to 1 volt than they should be, which would indicate sensor working properly and a lean reading, right ?
Then swapped out the MAF with one i had....p1151 after a few miles.
So now if i swap out upstream sensors and i still get p1151, i suppose i need to take a closer look at the UIM/LIM gaskets. I figure if the leak were somewhere else it would run both banks lean right ?
But if it is the gaskets, shouldn't the carb spray have had some effect? I sprayed it pretty liberally around the front bank.
How much of a leak will set off the sensor?
Any other ideas ?
I just replaced the engine and don't know if this motor was throwing codes in the previous car. Anyway, it runs smooth, although the idle is a little slow in coming down, compared to previous 2.5s.
So after installing the motor i get the p1151 code. I checked for vacuum leaks by the carb cleaner method with no hint of a leak. I used up more than half a can of the spray stuff in the process.
I then changed out the upstream o2 sensor with one i had...p1151 after a few miles. Datastream gives me a reading on the sensor, although i don't know exactly how to interpret the voltage readings, other than they appear high, like closer to 1 volt than they should be, which would indicate sensor working properly and a lean reading, right ?
Then swapped out the MAF with one i had....p1151 after a few miles.
So now if i swap out upstream sensors and i still get p1151, i suppose i need to take a closer look at the UIM/LIM gaskets. I figure if the leak were somewhere else it would run both banks lean right ?
But if it is the gaskets, shouldn't the carb spray have had some effect? I sprayed it pretty liberally around the front bank.
How much of a leak will set off the sensor?
Any other ideas ?