Chevy / GM P0171 or P0174 System To Lean Bank 1 Bank 2

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Flat Rate Mechanic

Күн бұрын

Пікірлер: 34

@FlatRateMechanic 3 ай бұрын

This is the smoke leak checker I got on Amazon amzn.to/4ccprqC. It works great!

@TEXAS-SMITH Ай бұрын

Thank you for taking the time to make this video. You explained a LOT to me. I bought a code reader and it was all secret code. Now I have a basic understanding of it and little problems to look out for. I wish I could thank you personally. Videos like this one are rare.

@atomicdmt8763 Ай бұрын

excellent info! good tip re removing the oil cap for the smoke test

@andrewfredrick7017 3 ай бұрын

this was very helpful thank you! i bought the smoke tester, it's great. found a tiny leak where the intake boot clamps to the throttle, but no change after that was tightened. did a water spray all over the intake manifold gaskets and no steam out of the exhaust. smoke tested the exhaust as well and nothing. my long term fuel trim is around 18% on both banks at low load or idle and drops to around 10% under medium throttle. i did notice my intake air temp was considerably off from actual air temperatures and very slow to respond to changes ( from sitting in a parking lot, hot start on a hot day, to diving down the highway at 55, it changed very slowly and never read the right temp, was always high by about 5-10%) new maf on the way, i think mine is original, 20yrs old, 264k on it. cleaning it didn't have any impact.

@DryBayouGarage 22 күн бұрын

this was a great explanation of troubleshooting...thanks for doing that, now to go put it in action

@COFFEE-e3p 13 күн бұрын

THANK-YOU BROTHER , STAY AWESOME...GOD LOVES YOU !!

@Joerockhead 10 күн бұрын

Excellent video my friend, thank you so much for this A+ lesson 👍🏽👍🏽

@robertrazo57 2 ай бұрын

So if I accelerate and my bank 2 trim goes down from 20 to 0 does that indicate bad fuel pump?

@atomicdmt8763 Ай бұрын

nonflammable brake cleaner? id think youd want to to react, right?

@ws2664 5 ай бұрын

You should have pulled up the data pid for the mass airflow sensor and see what the grams per second flow reading was, that might have told you something. Was that new sensor after market or dealer? great vid other wise.

@FlatRateMechanic 5 ай бұрын

We put a denso MAF - I've had pretty good luck with this brand. Wouldnt recommend after-market

@rsmith2463 21 күн бұрын

Great video man

@justinlong977 2 ай бұрын

I have these codes and ltft numbers when I TAP and release the throttle the truck revs up and stays at the high rpm on its own for a second or two then settles.

@jbags091992 Ай бұрын

Did you figure out what caused it, mine does the same thing

@justinlong977 Ай бұрын

@@jbags091992 replaced the hoses that were cracked and brittle but it didn’t change the fuel trims. I ordered a throttle body and swapped and my trims are now better, my tb was pretty gunked up. unfortunately now I’m have a high rpm issue with the new tb swap. common with cleaning or replacing tb’s but I’ve done everything KZbin has to offer and it’s still shooting up to 2k rpm.

@stevemaltez4123 4 ай бұрын

Excellent

@AbramDorny-xt2lm 5 ай бұрын

Thanks for posting the video. 2004 Yukon 5.3L threw a MAF sensor code, so I replaced with a Delphi MAF just this past week. Code cleared, and now I have 171 and 174. If I understand your comments, with more driving is it possible the fuel trim numbers settle out to be in spec and stops throwing those codes?

@tasaiyaxaypanya3140 4 ай бұрын

I got a 5.3 Silverado and just replaced Maf and getting the same code, did u figure it out?

@CHRISFREE84 3 ай бұрын

@@tasaiyaxaypanya3140Same thing did you find a fix

@josemunoz83 Ай бұрын

any fix?

@ChrisLuke-uz7hz Ай бұрын

Fix?

@AwesomeLife-h6p 14 күн бұрын

On the 5.3 its almost always header bolts snapped , loose, broken to the cylinder heads. Be ready for the fight of your life 😢

@hotcamaro9145 2 ай бұрын

There's some decent info buried in here, but the terms and language being used to describe some of it is wrong. Examples... Fuel trim is almost NEVER zero Fuel trim at idle isn't terribly helpful for a lot - trims under load matter much, much more - especially long-term trims. Specific issues with the 2014-2018 high pressure fuel pump design causes fuel leaks directly into the valves which causes a "rich" condition. This will set the MIL and DTC's but the only way to diagnose the bad LTFT's is while actively driving the vehicle. "Within 5% of zero" should like have been described as "within a range of plus or minus 5%" as "5% of zero" is zero...

@FlatRateMechanic 2 ай бұрын

I'm grateful for your detailed explanation and corrections on the terminology regarding fuel trim. Your input helps improve the accuracy of the content shared.

@venacorchea 3 ай бұрын

I replaced the Maf sensor, the intake gasket, replaced a PCV valve and the tubing and there’s not any other leak, now I have a P0174 code. Should I have to replace the oxygen sensors? Help!!! I already spent $700 pus the parts.

@ChrisLuke-uz7hz 2 ай бұрын

I have po171, which is the other bank lean. I can't figure it out either.

@alexlsx8187 2 ай бұрын

You figure it out? I have a p0171 only code, gonna change the o2 sensors

@ChrisLuke-uz7hz 2 ай бұрын

@@alexlsx8187 No. Not yet.

@zachparadis8455 Ай бұрын

I have both codes and replace all O2 sensors fuel pump throttle body purge valve and mass air flow

@s4ljb665 23 күн бұрын

@@zachparadis8455did you have any luck yet? I’m desling with the same issue plus knock sensors both banks.