2007 Yukon..Engine issues. Need help asap

[Kodiak Yukon]

Alright where do I start. 2007 Yukon SLT 5.3.

Call was shifting rough and idling bad

check engine light came on.
Map sensor
Lean bank 1
Lean bank 2


replaced map sensor

shifting rough went away.

lean bank 1 and bank 2 stayed.

ordered a new MAF unit. Being shipped now.

car runs a little rough not to bad

this morning the DIC indicates the car is in park and no speed indication when driving. The seat belt and airbag lights are flashing and seat belt is connected.

where do I start. Please send me anything you have for me.

 

[wjburken]

Alright where do I start. 2007 Yukon SLT 5.3.

Call was shifting rough and idling bad

check engine light came on.
Map sensor
Lean bank 1
Lean bank 2


replaced map sensor

shifting rough went away.

lean bank 1 and bank 2 stayed.

ordered a new MAF unit. Being shipped now.

car runs a little rough not to bad

this morning the DIC indicates the car is in park and no speed indication when driving. The seat belt and airbag lights are flashing and seat belt is connected.

where do I start. Please send me anything you have for me.

What are the actual codes you are seeing?

How old is your battery?

A quick thing that you can try to get your dah out of its little snot-fit is disconnect both the positive and negative battery cables and touch them together. I know it sounds weird, but it has solved a lot of problems when things just go haywire.

 

[Kodiak Yukon]

What are the actual codes you are seeing?

How old is your battery?

A quick thing that you can try to get your dah out of its little snot-fit is disconnect both the positive and negative battery cables and touch them together. I know it sounds weird, but it has solved a lot of problems when things just go haywire.

I will have to give you the codes of the edge when the wife gets home from work. We only live a mile from work so it wasn’t a big deal driving.

battery is a year and half old. But we do live in Alaska. So anything is possible.

touch battery leads together? Really?

 

[wjburken]

I will have to give you the codes of the edge when the wife gets home from work. We only live a mile from work so it wasn’t a big deal driving.

battery is a year and half old. But we do live in Alaska. So anything is possible.

touch battery leads together? Really?

Battery cables. After disconnecting them from battery of course. It’s like a reboot in the car.

 

[Kodiak Yukon]

Battery cables. After disconnecting them from battery of course. It’s like a reboot in the car.

Ok. I will try it out. Then I guess take it for a drive.

 

[wjburken]

Ok. I will try it out. Then I guess take it for a drive.

That hopefully will clear up your dash issues.

Still curious as to the codes your seeing.

Have you had any work done on the vehicle lately?
How many miles on it?

 

[Kodiak Yukon]

That hopefully will clear up your dash issues.

Still curious as to the codes your seeing.

Have you had any work done on the vehicle lately?
How many miles on it?

P0174
P0171
P0106

130k miles

 

[OR VietVet]

With that mileage you may need to replace at least the oxygen sensors, especially if they are all the same age.

I would also, while you have the battery cables off the battery, look at all the ground wires that are all over the place, especially anywhere on the engine and at the firewall and frame connections. Many many threads here about dirty/loose/corroded ground contacts causing multiple codes all at once.

 

[wjburken]

P0174
P0171
P0106

130k miles

In addition to what Ron mentioned about O2 sensors, Just for kicks, check the PCV hose that goes from your drivers side valve cover to the intake manifold, particularly where it attaches to the valve cover. They have been known to split there.

 

[Kodiak Yukon]

Wife j

In addition to what Ron mentioned about O2 sensors, Just for kicks, check the PCV hose that goes from your drivers side valve cover to the intake manifold, particularly where it attaches to the valve cover. They have been known to split there.

Wife just got home and when she started the car to come home everything on the dash worked normal. It is snowing pretty good outside so I am going. To let it be. MAF gets here on Monday so I will rip into the car then. Thank you for all the info. I will plan on checking the ground. Great idea. O2 sensor. Probably should do that anyways. I am a preventive maintenance guy. Love that idea as well. Thank you for all the info. I will have to do a relearn on the system for the MAF anyways so I will be doing some battery work then.
Thanks again all for the details. Will continue to watch this if you all have more guidance.
Jason

 

[OR VietVet]

Maintenance pays and breakdowns cost.

 

[wjburken]

My dad was a fireman for 54 years. He said the fire fighters may get all the glory, but it is the fire preventers that avoid the need for fire fighters and typically go unnoticed for it. He told me to be a fire preventer.

 

[Kodiak Yukon]

Thanks all.
I am a helicopter mechanic by trade. So everything I do is preventive maintenance Unless a pilot **** something up haha.

 

[BG1988]

What are the actual codes you are seeing?

How old is your battery?

A quick thing that you can try to get your dah out of its little snot-fit is disconnect both the positive and negative battery cables and touch them together. I know it sounds weird, but it has solved a lot of problems when things just go haywire.

That is wrong Never discharge the system doing that

there is better ways to do that, without shorting it out.
plug in a cell adapter to the 12volt socket or cycle the key a few times...

 

[wjburken]

That is wrong Never discharge the system doing that

there is better ways to do that, without shorting it out.
plug in a cell adapter to the 12volt socket or cycle the key a few times...

That is a matter of opinion.

If both cables are disconnected, what you are saying to do is doing nothing different than what I recommended.

 

[BG1988]

That is a matter of opinion.

If both cables are disconnected, what you are saying to do is doing nothing different than what I recommended.

its adding a load rather then shorting it to ground.... short circuit is different then adding a load to remove charge from the system
Even a resistor load will reset the computer


it only takes a few seconds to reset the computer on one these anyway.... by flipping on the headlights... with the battery disconnected why risk damaging a ECM or something else that will cost a ton of money to replace just to save a couple of seconds?

 

[wjburken]

its adding a load rather then shorting it to ground.... short circuit is different then adding a load to remove charge from the system
Even a resistor load will reset the computer


it only takes a few seconds to reset the computer on one these anyway.... by flipping on the headlights... with the battery disconnected why risk damaging a ECM or something else that will cost a ton of money to replace just to save a couple of seconds?

Perfect. With all the resistance that exists in the grounding system, as you have pointed out numerous times, there should be enough load so there is. It a direct short like you say.

 

[BG1988]

Perfect. With all the resistance that exists in the grounding system, as you have pointed out numerous times, there should be enough load so there is. It a direct short like you say.

that is still a Resistive load
it's still not a short circuit


and since it's an incomplete circuit it would have no effect..

i.e turning the headlight is a completed circuit which can discharge the system without potentially causing damage..


a good example is the air bag controller module it uses a Resistive load (a bleeder resistor)to safely discharge the module.

 

[Doubeleive]

Brent go away, go measure your wheel height again since you seem to be confused about what 2" is

Jason, the 02 sensor's on these trucks are rated for 100k miles, I would recommend changing all 4 at once, you can get a good price from rock auto, the set of 4 ran me about $200 or close to it. you may want to also order a crows foot & 02 sensor socket to get the drivers side one in & out it's a real *****, you wont hurt anything disconnecting the battery, while you have the cables off give the battery post and cable ends a good scrub with a wire brush. These trucks are pretty finicky when there is power fluctuations, poor ground etc we see it all the time.

 

[BG1988]

Brent go away, go measure your wheel height again since you seem to be confused about what 2" is
.

i looked at my parking spot it was just a bump in the spot were i park so the axle was tilting forgot it was a solid axle... it's still stupid to short the connections out anyways This is not a vehicle from 1960s where you can disconnect random shit when it's running without damaging anything and short shit out without problem... mine resets as soon as you pull the power cable from the battery anyways, so the NNBS don't need to be discharged at all..




it WOULD in fact cause damage if reverse polarity protection diode(s) were bad(or none were in place)