Troubleshooting a 2009 Toyota Corolla with p0171 code

[@thermal1966]

Great video. Very helpful thank you.

[@andyavila8080]

Great video where would you recommend me getting a fuel pump replacement for my Toyota Corolla 2011

[@jirojosephesman8175]

Great video.. Any how to for the attachment for the fuel gauge and vacuum leak test...because I have the same however mine was both p0301..p0171..p0420.. Thank you have a blessed day and be blessed

[@rainierhabervo7380]

Thank you so much for the technical help, that’s exactly what’s going on on my 2009 toyota corolla

[@CreativeChaos2024]

I had one like that 1 time it was the gasket on the plastic exhaust manifold had flattened out

[@DuaneDonaldson]

As you can see, LTFT does not go back to zero like STFT does, it takes time for the different fuel cells to correct at different RPM ranges and you have not driven the car yet. Your initial DIAG of no vacuum leak based on LTFT was expecting a change back near zero that takes more time to correct while STFT showed a vacuum leak right away as part of the problem. I am a scope guy, I would have scoped the pump right after seeing the low pressure then I would have checked the waveform again at 3K RPM to watch the FP speed up a lot with a loss of pressure on the gauge, bad pump. I can tell you don't watch Mansoors Channel from Pakistan, he does what I call the Mansoor Tune Up, pulls the pump unit, the entire induction system, injectors to bench flush, plugs and coils, removes the TB to clean and intake manifold, O2s to clean and plugs to clean and recycle if not too old and CAT to wash with a chemical cleaner. After cleaning and flushing and a new/used OEM FP motor only, all back together for one low price and maybe a few guys working on it together. Might get a valve adjustment, might get the fuel filter back flushed, might get new plugs and filters, will get the MAF cleaned and maybe I forgot something? Oh yes, will get the fuel pump pick-up sock and entire assy disassembled and cleaned by hand with gas. I pray the EPA doesn't come knocking your door down, the internet is forever Bro. Thank you for the all-around explanations for the young troops, cheers.

[@siddiqui-q4r]

My 2009 Toyota corolla having problem at rush hours , it stop and does not start immediately but start after 45 minute . The car is run good if there is no rush on the high way

[@gautorepair]

That's interesting 🤔. That's definitely going to need someone to look into that

[@alexanderaparicio9653]

Hey man can you give me clues, I have a 2007 corolla and I have p0171 I had replaced the o2 sensor, intake manifold gasket, maf, pcv valve, pcv hose, fuel pump with oem and the code still pops, the fuel trim ltft is at 33.6 and stft close to 0, when I increase the rpm from a stop sign or highway ltft gets worse and goes to 39.6, when I let it go ut goes back to 33.6, at idle stays between 29 to 33, fuel pressure is good at 45 to 50 and no vaccum leaks detected with smoke detector. Any clues?

[@gautorepair]

Restricted fuel injectors would be my next guess

[@alexanderaparicio9653]

@gautorepair thank you, I replaced them with new ones, and now the ltft got corrected and stays below 9 percent. Two of them were partially clogged with carbon built up. They were originally denso with 193K miles on it!

[@gautorepair]

@alexanderaparicio9653 excellent. Thanks for following up.

[@jgwalli2421]

I have 171 and 133