LS1TA_956

iTrader: (1)

So Ive been having trouble with my 1998 Trans Am it stumbles when warm (on closed loop) at wot in low rpm range like from 1k to 3k........ It runs fine when cold in open loop. I also have to prime it twice sometimes 3times for it to start fuel rail looses fuel pressure if left off more than five minutes..

*also where is the fpr located at? is it the one in the rail?

I put the scanner and these are the codes:
P0171
P0157
P0131
P0151
P0153

THANKS FOR ANY INPUT ....!!

LS6427

iTrader: (2)

They all point to a bad 02 sensors. Bank 2 Sensor 2. So passengers side, rear sensor. Passengers side front sensor. And Bank 1 Sensor 1, drivers side front. So 3 bad sensors.

I would get a scan with an OBD11 scanner WHILE the engine is running to make sure they are all bad. If its conformed, buy 4 new ones.

P0171 System too Lean (Bank 1)
P0157 02 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
P0131 02 Sensor Circuit Low Voltage (Bank I Sensor I)
P0151 02 Sensor Circuit Low Voltage (Bank 2 Sensor I)
P0153 02 Sensor Circuit Slow Response (Bank 2 Sensor 1)

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artic99z28

check your cat to make sure its not clogged more likely than not your whole o2 sensor system is working fine its just thinking u have a lean condition wich only worsens the problem so

-check your catalytic converter to see if its clogged-
thats way more like ifs prly not sensor system if it was just 1 sens id say maybe but its not its 3 , also the loss of pwr when under wot tells me clogged cat