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2006 gmc Envoy p0171

2006 gmc Envoy p0171
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2/23/2018
KALAMYKID
KALAMYKID, Shop owner, tech
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Experience: HAVE OWNED MY OWN SHOP FOR OVER THREE YEARS. I HAVE THE TOOLS AND SOFTWARE TO ANSWERE ALMOST ANY QUESTION CORECTLY.
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This code is set when the drivers side of the engine is running to lean. To correct this code you need to check for fuel pressure " it should be right around 60 psi" vacuum leaks " this can be a broken vacuum line or leaking intake gaskets", or the problem can be clogged fuel injectors, or a bad injector that is not opening.

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Customer reply replied 5 months ago
I just replaced the fuel pump the float was bad

I can not tell you how many times I have replaced a fuel pump, and it would not create enough pressure. You need to check it just to make sure the pump is good.

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Customer reply replied 5 months ago
Please send me vacuum diagram and how do I test for leaking intake
Customer reply replied 5 months ago
Also how do I test the injectors

The best way to find a vacuum leak is to use gumout carb cleaner in short burst withe engine running around the intake and vacuum lines. If the engine rpms comes up when you hit a spot with the carb cleaner, that is where your vacuum leak is.

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Customer reply replied 5 months ago
Ok I will try it

Let me know what you find and we can go from there.

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Customer reply replied 5 months ago
Ok sounds good

Thank you.

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Customer reply replied 5 months ago
Sprayed all around and nothing fuel pressure is good

What was the fuel pressure?

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Customer reply replied 5 months ago
58 to 60

Very. Can you see what the lt trim is with the rpms up around 2000 please?

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Customer reply replied 5 months ago
It drops down

But the st trim went way up. Have you cleaned the mass air flow?

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Customer reply replied 5 months ago
No
Customer reply replied 5 months ago
I will first thing in the morning

See if that does not bring down the lt trim leaves. To reset the lt trim, hold the gas pedal tot he floor with it running in park. The rev limiter will kick in around 3000 rpms so do not worry about hurting it. Hold it there for 5 seconds and let off of the pedal slow. See if the lt will come down to around 3.

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And you are 100% sure you do not have any vacuum leaks?

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What size engine is in this truck and is it a 2wd or a 4wd?

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Customer reply replied 5 months ago
2wd 4.2 checking again
Customer reply replied 5 months ago
You never sent the vacuum diagram so I am spraying blindly

Make sure to check the hose in the drivers side of the intake that is connected to the center of the intake. These hoses are bad about oil deteriorating the rubber and causing a vacuum leak.

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This engine only has two vacuum lines, the main line for the brake booster, and the pcv hose in the center of the intake.

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The evap lines are hard plastic lines, and have quick disconnects on them.

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Customer reply replied 5 months ago
I have checked those and the cap on the driver side front

And you sprayed all around the intake where it bolts to the head?

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Customer reply replied 5 months ago
2 cans 4 different attempts

I believe that you may have a bad mass air flow.

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Customer reply replied 5 months ago
I cleaned it but will replace it

Let me know what the fuel trims do after you replace it.

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Customer reply replied 5 months ago
Now it also has p0014

Then you may not have a bad mass air flow. This code is set when the cam phasing system has a fault. Let me do some checking and see what you need to do to correct this code.

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Customer reply replied 5 months ago
Ok

Sorry for the delay. To test this system you have to have a scan tool that will control the DOD solenoids. Do you have one?

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Customer reply replied 5 months ago
P2119
P0171
P0014
After mass air flow sensor replacement
Customer reply replied 5 months ago
I don’t think I have 1

I hate to say it but it is looking more like the throttle body is going bad and letting in to much air due to the throttle plate not closing all the way.

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Customer reply replied 5 months ago
I will order 1 and will let you know

Do you have an auto salvage yard near you? A new or rebuilt unit will cost way to much, where you can get a good used one for around $50.00

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Customer reply replied 5 months ago
I ordered a new one 190 dollars

Let me know when it comes in and I will walk you through replacing it, and doing the relearn.

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Customer reply replied 5 months ago
Ok thanks

You are very welcome.

KALAMYKID
KALAMYKID, Shop owner, tech
Category: GMC
Satisfied Customers: 5,593
Experience: HAVE OWNED MY OWN SHOP FOR OVER THREE YEARS. I HAVE THE TOOLS AND SOFTWARE TO ANSWERE ALMOST ANY QUESTION CORECTLY.
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