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Shaky idle shutdown... lol thanks for asking. changed Mass…

Customer Question
Shaky idle shutdown... lol...

Shaky idle shutdown... lol thanks for asking. changed Mass Air Flow and Throttle Body (new parts). drives better but still trying to shut down when coming to a stop

Mechanic's Assistant: How many miles are on the car? What size is the engine?

224K, 1 owner (me)

Mechanic's Assistant: What is the model/year of your GM?

2003 Yukon SLE

Mechanic's Assistant: Are you fixing your Yukon yourself? What have you tried so far?

I changed the Mass Air Flow and the Throttle Body

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

No and thank you

Submitted: 6 months ago.Category: GMC
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Customer reply replied 6 months ago
Note, I am not a mechanic. I comfortable following an instruction set (can read schematic) and not scared of a semi-easy/difficult task. I placed both the MAFS and the throttle body on the car myself, as both were/are extremely easy to get to
Answered in 11 minutes by:
1/5/2018
GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 6 months ago
david craig
david craig, Owner/[email protected] 3D Atuomotive
Category: GMC
Satisfied Customers: 5,808
Experience: owner/mechanic at 3D Automotive
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Hi my name is ***** ***** I'll be more than happy to assist you. Please allow me a few minutes to review your information. Thank you

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GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 6 months ago

was the check engine light on which lead you to fault codes for the MAF and Throttle body replacement?

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Customer reply replied 6 months ago
ALSO, check engine light is still on and computer giving 7 or 8 faluts/errors however, it's 4 of 1 and 3 of another (post installation. 4 codes (2 and 2) are all MASF too lean banks 1 and 2. the other 3 say the same thing without the MASF reference. To answer the question yes, that's part of the reason I changed the parts. But it was more about the idling/shutting off when coming to a stop. I had disconnected the MASF and it drove better but I ended up getting a message about reduction in power. This happened on Tuesday and was after trying two new MASF sensors (put back in the 10 o'clock position and all screws tightened). I was going to change the TPS, but they 100 for it alone and the one on the unit was not on with clamps.
GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 6 months ago

what are the fault code numbers?

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Customer reply replied 6 months ago
p0171 was 1, but I don't have the print out with me at work. I may be able to run to the nearest AutoZone and get a quick scan. I do however have the report at home
GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 6 months ago

that would be best before I start diagnosing things.

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Customer reply replied 6 months ago
What are my options in getting back to you. I only get a 30 minute lunch. I'm going to try and get the diagnostic report but if i can't get it until after work (5:30 PM Eastern time) is that ok
GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 6 months ago

you can get back to me anytime you want to. right here

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GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 6 months ago

holy smokes.... this will take a while. do you have a voltmeter and a scan tool that reads live data?

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Customer reply replied 6 months ago
I do, but certainly not here with me. I have a small electrical back ground so i should be able to follow instructions.
GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 6 months ago

great. ill gather up some troubleshooting

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Customer reply replied 6 months ago
thanks
GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 6 months ago

you bet

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Customer reply replied 6 months ago
the suggested stuff from the print off i'm not concerned with at the moment, just the errors
GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 6 months ago

i understand that,... we will need to do some testing

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