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I have a 2000 GMC 3500 sierra with check engine light on…

Customer Question
hello i have a 2000 GMC...
hello
i have a 2000 GMC 3500 sierra
with check engine light on
codes po171 ans po174
i need help with how to read the o2 sensor data
thanksalready checked for intake leaks and intake manifold gasket but it all seems fine and engine works and runs good and smoothtruck does not pass smog check
Submitted: 6 months ago.Category: Chevy
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Answered in 2 minutes by:
1/5/2018
Chevy Mechanic: Chris (aka-Moose), Technician replied 6 months ago
Chris (aka-Moose)
Chris (aka-Moose), Technician
Category: Chevy
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How did you check for vacuum leaks?

Which engine?

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Customer reply replied 6 months ago
i saw a youtube video where the guy poor water around the intake gasket and the engine started acting out, mine did not, also someone told me to spray cleaner around the top of the engine to see if it acts wierd but nothing, any other way i can chek, also check every single hose and nothing, i wish i had a smoke machine but im gonna try and get one soonenigne is 5.7L v8
Customer reply replied 6 months ago
can't talk on the phone right now, as im at work and the truck is at home
Chevy Mechanic: Chris (aka-Moose), Technician replied 6 months ago

Will your scan tool allow you to check the short term fuel trims?

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Customer reply replied 6 months ago
not sure i my scan tool would do that, i can see the O2 data
Chevy Mechanic: Chris (aka-Moose), Technician replied 6 months ago

Is that something you could check when home and respond then.

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Customer reply replied 6 months ago
my scan tool is the mps700 by matco tools
Customer reply replied 6 months ago
i saw the readind for the bank 1 sensor 1 going crazy, from 0.130 to 0.850 and gave me too manny diferent readings
Customer reply replied 6 months ago
ok. maybe we can continue this tomorrow mornig when im home and have the truck and scan tool in hand, that way you can tell me what to do step by step
Chevy Mechanic: Chris (aka-Moose), Technician replied 6 months ago

My day tomorrow is hectic but I will be online about 8 hours just sporadic throughout the day. When you get home tonight can you see if the tool can read short term trims if so respond then? I can then give you some tests to get started on for Saturday.

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Customer reply replied 6 months ago
you think we can do this with my scan tool or should i try and get a better one for this issue?
Customer reply replied 6 months ago
ok, i 'll check to see if my scan tool can read short term trims, then we can talk, thanks and good day
Chevy Mechanic: Chris (aka-Moose), Technician replied 6 months ago

Sounds good.

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Customer reply replied 6 months ago
Sorry, i did not have time to check if the scan tool works got really busy but will try tomorrow and keep you updated
Thanks
Chevy Mechanic: Chris (aka-Moose), Technician replied 6 months ago

OKay

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Chevy Mechanic: Chris (aka-Moose), Technician replied 6 months ago

Hello, Chris here again,

I am checking in to make sure you got everything you expected from my answer. The option to rate my response or reply is still available. I want to make sure you were pleased with what you paid for.

Thanks Chris

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