P1171 Fuel System Lean During Acceleration

[olsonjus]

Well, I took it into the shop. Looks like I had a bad o2 sensor that was causing my A/F mixtures to be off during closed loop.

Justin

[CSTYLES]

I had same problem. Lost acceleration on the highway. Started slowing even with the gas pedal floored. When I got over to the shoulder it completely stalled out.
Check engine light; retrurned P0137, P0157, and P1171.

They replaced both O2 sensors and its running real smooth now.

[Tone]

Cool new gauge a buddy told me about - gives live readout of codes and their meaning - http://www.scangauge.com/scan.htm

[LittleBeast]

So my check engine light has been on since I bought the car on December 2nd. When I tried to get it inspected in Houston it failed because:

Fault Codes:
P0440: Evaporative Emission Control System Malfunction
P0405: Exhauast Gas Recirculation Sensor A Circuit Low

What does this mean and what should I do? I do have the PV Muffler (it was on there when I bought it). Thanks in advance, Ryan. Oh yeah I drove outside the city to Waller, TX(middle o' no where) to get it inspected and it passed even with my cracked belt that I need to replace!

[Raque Thomas]

So my check engine light has been on since I bought the car on December 2nd. When I tried to get it inspected in Houston it failed because:

Fault Codes:
P0440: Evaporative Emission Control System Malfunction
P0405: Exhauast Gas Recirculation Sensor A Circuit Low

What does this mean and what should I do? I do have the PV Muffler (it was on there when I bought it). Thanks in advance, Ryan. Oh yeah I drove outside the city to Waller, TX(middle o' no where) to get it inspected and it passed even with my cracked belt that I need to replace!

Did you buy it from an auto dealer? If so, take it back and amke them fix it - in KY it is not legal to sell a car that will not pass the emissions test. If you bought it from an individual (or the place you bought it from will not help), it may be under warranty. I think that emissions systems are covered by law up to 50,000 miles.

[Maugan_VX]

Tone, while I like that box, the one I have my eyes on is www.autotap.com

check it out, you have a laptop or a palm pilot and you have a code reader, and engine diagnostic tool

and yes its going on my carputer

[GoIsuzu]

There's a TSB issued in April '00 regarding P1171.

Service Information

Condition: Some customers may complain that the engine runs rough or MIL light on. In some cases, vacuum leak noise may be heard as well. [Intermittent rough idle and/or the MIL is on with DTC P0171 (Fuel Trim System Lean Bank 1), P0174 (Fuel Trim System Lean Bank 2), or P1171 (Fuel Trim System Lean During Acceleration)].

Probable Cause: It was found that the inlet manifold gasket(s) were cracking due to excessive stress caused by heat expansion/contraction.

Correction: Replace old inlet manifold gasket(s) with new inlet manifold gasket(s).