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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 1682
Experience:  GM Grand Master Technician 2007. 14 year experience.
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2005 8.1 idle rough and sometimes stalls, consistent, crew

Customer Question

2005 8.1 idle rough and sometimes stalls
JA: Is the rough idle intermittent or consistent?
Customer: consistent
JA: What is the model of your '05 GM?
Customer: crew cab 4x4 LS
JA: Are you fixing your Cab yourself? What have you tried so far?
Customer: yes and no but I did replace the mass air sensor
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 11 days ago.
Category: GMC
Expert:  david craig replied 11 days ago.

Hi Im David, thanks for visiting the site. Is the check engine light on?

Customer: replied 11 days ago.
Expert:  david craig replied 11 days ago.

do you have a code reader?

Customer: replied 11 days ago.
running lean
Expert:  david craig replied 11 days ago.

whats the code

Customer: replied 11 days ago.
not sure 02 sensor but I will have to plug it back in . to get the code do not remember a code sorry
Expert:  david craig replied 11 days ago.

p0171 or p0174?

Customer: replied 11 days ago.
not sure of the code just remember running lean and o2 sensor new scan tool just try to figure it out
Expert:  david craig replied 11 days ago.

ok, well let me know

Customer: replied 11 days ago.
checking the history on the scan tool
Expert:  david craig replied 11 days ago.

ok

Customer: replied 11 days ago.
just ran a system scan, no codes I didn't understand it
Expert:  david craig replied 11 days ago.

check engine light is still on?

Customer: replied 11 days ago.
on the diagnostic menu, I/M Readiness had x on evap and a x on cat
yes engine light is still on
Expert:  david craig replied 11 days ago.

not worried about the i/m readiness. what scan tool are you using?

Customer: replied 11 days ago.
cen- tech obd11/eobd
Expert:  david craig replied 11 days ago.

does it read live data?

Customer: replied 11 days ago.
it can but I did not
Expert:  david craig replied 11 days ago.

can you check the fuel trims for me?

Customer: replied 11 days ago.
not sure what that is, fuel system came up as green/good. I will read more about the scan tool and try it again in the morning.
Expert:  david craig replied 11 days ago.

ok, let me know

Customer: replied 11 days ago.
Just ran a scan, now I have a generic code SAE J 1850 VPW
Expert:  david craig replied 11 days ago.

that not a code thats a protocol

Customer: replied 10 days ago.
just check the book #1 fuel and air metering
#8 transmission control
#5 vehicle speed or idle control
# 0 generic
I am going to reset to factory spec's as they recommend lets see what happens
Expert:  david craig replied 10 days ago.

you need to read the book a bit more, those are not codes.

Expert:  david craig replied 7 days ago.

just checking in to see how its going

Expert:  david craig replied 4 days ago.

you ever figure out your scan tool?