Not sure what to do

[Badluck251728]

I have a 08 Yukon with 213k on it. Love the vehicle but it’s been jerking and acting strange when accelerating. No codes and happen more as the vehicle gets warm from driving. Any help or advice would be appreciated

 

[mikez71]

Maybe a transmission issue..

Do you have a good scanner that will check transmission codes?

 

[Badluck251728]

Maybe a transmission issue..

Do you have a good scanner that will check transmission codes?

I don’t personally own a scanner. But I’ve had a couple of friends plug there’s in. No codes on anything. I’m not a car guy at all. Could it be fuel filter?

 

[Fless]

Which engine? How long since the MAF was cleaned?

Get some live data with a scanner, and look for anything that's out of whack
- Engine Coolant Temp sensor value (cold, and as the engine temp rises)
- MAF reading in g/s (not lb/min) and corresponding RPM
- Intake air temp value
- individual cylinder misfire counts
- fuel pressure at rail, KOEO
- document fuel trims at idle and at 1500 or 2000 RPM

 

[Marky Dissod]

Before firing the parts cannon, aim well, then fire the parts derringer.
Clean or replace MAF sensor and MAP sensor.
Some transmission issues are in fact throttle position sensor issues. Is it working properly after 213k miles?

If your coolant temp sensor is intermittently connecting and disconnecting,
your fueling and spark could be alternating between closed loop and open loop,
which could cause bucking and jerking.

Although I doubt it's the fuel filter, it should be cheap and quick to replace,
just don't be surprised when it's not the problem.

What about the cam and or crank position sensors?

It likely needs scanning IN REAL TIME while you're driving if there are no codes.

 

[Fless]

I don't think there's a fuel filter on these, except for the filter sock on the fuel pump. I could be wrong, though.

 

[Badluck251728]

Thank you all for reaching out with suggestions. I’ll keep ya updated

 

[Badluck251728]

Which engine? How long since the MAF was cleaned?

Get some live data with a scanner, and look for anything that's out of whack
- Engine Coolant Temp sensor value (cold, and as the engine temp rises)
- MAF reading in g/s (not lb/min) and corresponding RPM
- Intake air temp value
- individual cylinder misfire counts
- fuel pressure at rail, KOEO
- document fuel trims at idle and at 1500 or 2000 RPM

6.2

 

[j91z28d1]

I don't think there's a fuel filter on these, except for the filter sock on the fuel pump. I could be wrong, though.

you're right

 

[OBSalsoNNBS]

Thank you all for reaching out with suggestions. I’ll keep ya updated

@Badluck251728
How'd it shake out? My 2012 has been having Throttle body/sensor issues, the main symptom is a weird rev bump/lurch on 2-1 downshift and stopping.