EthanF

Right now I'm running 225/55's on my 17's all around so I don't think that can be it. And to add to the confusion after driving to the gas station and filling up before the dry gas, it wouldn't start!!! After a quick jump from a nice old man it fired right up, but still threw me off how that happened...

Spike100

^^ Your tire sizes are good. --Spike

myfirstzcar

Yeah no reason to suspect a tire issue, as long as the tires are the same size or the rears are slightly larger.

EthanF

So all was good until today in -10 degree weather it bogged down, gave me a SES which read as both front 02 sensors. Cleared the codes, reset the cry and it was perfect the rest of the way home. WHAT THE EFF?!?! If they were truly the problem it should still have issues after the reset, no? I'm beginning to think my car just doesn't like the cold....

myfirstzcar

The ecu reset will reset the rediness monitors, which means it may not detect a problem right away. both O2 sensors throwing codes, I would look for a lean condition being caused by something.

EthanF

And finally I have some codes to work with!!! P0321, P0152, P0300, and P0158! Which if I'm getting this right is that I have a misfire! Not sure where to go from here...possibly a bad coil pack/injector? :/

myfirstzcar

Random misfires are most likely to be caused by a fuel delivery issue, but there are many other possibilities.

EthanF

Cleaned the (very dirty) throttle body today, did all the resets and got the readings off of the front O2 sensors....both read 1.3 volts!!!! If I'm not mistaken that's really really rich :/ Now I'm even more confused

myfirstzcar

Did you let it warm up and go into closed loop before you took the readings?

EthanF

Yep! Even while cruising on the highway it was a pretty steady reading of 1.3v from the sensors

myfirstzcar

That sucks. FYI, if you have a coil pack issue your check engine light will flash. I think I'd dismiss that possibility for now.

EthanF

Swapped maf sensors with a friend today....still rough idle and still the ses light comes on showing both o2 sensors are reading high voltage. Could they booth be the root of my problem? I'm running out of ideas

EthanF

And the 03003 misfire I should add too :P

myfirstzcar

What are the rear O2 sensors reading? I have a sensor getting bad on my truck, the fuel trims are even, rear sensors are even, one upstream sensor reads a bit high. Fortunately, it's still within it's range and there's no worries at this time.

EthanF

both upstream sensors are reading a pretty steady 1.3v

myfirstzcar

And the downstream sensors?

350Zdj

iTrader: (3)

Maybe you should check if all plugs are firing. It could be just bad coilpacks.
I had dead coilpacks before and it made the car idle rough and lost a huge amount of power. It also caused CEL and a few other errors to show up.

EthanF

Downstream sensors are also reading 1.3v due to test pipes I'm assuming. Coils should be good if I checked them right

myfirstzcar

Ok, all of your sensors are reading 1.3v correct? Your car is extremely rich. I don't believe they can go past 1.3v, but I may be mistaken there.

myfirstzcar

I would also rule out the misfiring completely, since running extremely rich will cause the ecu to detect a misfire. Something is causing this car to dump fuel, and I'm thinking it's intermittent as well.