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2000 Toyota Celica GTS (P0171)

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18 Mar 2020 15:54 - 18 Mar 2020 15:55 #38424 by BLEE
2000 Toyota Celica GTS (P0171) was created by BLEE
Working on a 2000 Toyota Celica GTS with a P0171 but only at a RPM range of 3,000-4,000 RPM's according to the freeze frame data. The short term fuel trim is good, but the long term fuel trim at this higher RPM is +30% to +40%. The individual that owns the car replaced the intake gasket, MAF sensor, & oxygen sensor. We smoked the car and no intake leaks are found. The WOT test is good since the O2 sensor B1S1 reads rich .7vdc to .9vdc. The only after market parts on the car is a aftermarket intake air tube and K & N air filter. Any help is greatly appreciated.

Brian
Last edit: 18 Mar 2020 15:55 by BLEE.

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18 Mar 2020 16:39 #38427 by John Curtis
Replied by John Curtis on topic 2000 Toyota Celica GTS (P0171)
Lean at higher rpm? Move toward fuel issue. What does your MAF read at idle and at 3k?

Thinking out loud always helps me in the process.

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18 Mar 2020 17:05 #38428 by Cheryl
Replied by Cheryl on topic 2000 Toyota Celica GTS (P0171)
Perform a volumetric efficiency test. Do a wide open throttle in 1st gear graph the maf g/s intake air temp, engine rpm and engine liter size. Report back with numbers. Also these things are known for fuel injector issues. Take fuel alcohol content sample.
The following user(s) said Thank You: juergen.scholl

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19 Mar 2020 14:58 #38449 by BLEE
Replied by BLEE on topic 2000 Toyota Celica GTS (P0171)
Copy I will do that and get the numbers. Thank you.

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