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Help troubleshoot problem plz...

Old 10-30-2011, 12:02 AM
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Unhappy Help troubleshoot problem plz...

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:


Last edited by LS1TA_956; 10-30-2011 at 12:33 AM.
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Old 10-31-2011, 08:39 PM
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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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Old 11-02-2011, 08:04 PM
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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
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