@Grandpadave52

What year is this Buick, and does it possibly have Stabilatrak (Vehicle Stability Assist)?

50 minutes ago, Larry Buskirk said:

Seems more like cam position sensor, did they replace the sensor when they replaced the gear?IDK? Maybe?

Does it stumble when cold, or after it warms up?Yes

 

47 minutes ago, Larry Buskirk said:

@Grandpadave52

What year is this Buick, and does it possibly have Stabilatrak (Vehicle Stability Assist)?

2011 Enclave and yes pretty sure it does.

1 hour ago, Grandpadave52 said:

Does it stumble when cold, or after it warms up?Yes

 ... Does that mean both? 

1 hour ago, Grandpadave52 said:

2011 Enclave and yes pretty sure it does.

 ... Acts like a Throttle Position Sensor? Stumbles just off idle? 

TPS would affect more than one cylinder.  in theory.

1 minute ago, Gunny said:

TPS would affect more than one cylinder.  in theory.

I haven't got to where I'm going with this. The stumble just off idle is simply a clue.

If it's what I'm thinking they're totally looking in the wrong direction.

1 minute ago, Gunny said:

TPS would affect more than one cylinder.  in theory.

Has been my experience limited as it is. Not that it dismisses TPS, but the throttle body was pretty darn clean for year and miles. The "stumble" is a definite miss. Old as I am, I could detect it by ear and feel out the left tailpipe.

2 minutes ago, Grandpadave52 said:

Has been my experience limited as it is. Not that it dismisses TPS, but the throttle body was pretty darn clean for year and miles. The "stumble" is a definite miss. Old as I am, I could detect it by ear and feel out the left tailpipe.

Is the stumble just off idle, when you press the gas to go?

3 hours ago, Larry Buskirk said:

Is the stumble just off idle, when you press the gas to go?

Thanks Larry for your phone call this afternoon with the suggestions and possibilities. Hope my raspy, ragged voice was not a distraction. IDK if we solved the Buick problem, but I think we effectly covered other problems and pretty sure we didn't add to any world problems

 

Oh, best watch for COVID cooties the next few days just in case some escaped through the phone

12 hours ago, Grandpadave52 said:

Thanks Larry for your phone call this afternoon with the suggestions and possibilities. Hope my raspy, ragged voice was not a distraction. IDK if we solved the Buick problem, but I think we effectly covered other problems and pretty sure we didn't add to any world problems

 

Oh, best watch for COVID cooties the next few days just in case some escaped through the phone

It was nice conversing with you Dave, these crazy Canbus systems can really make you .

It's strange how one systems control module can affect the performance of another system, that in theory it shouldn't be able to do. Intermittant failures are the worst in that a borderline failing part doesn't trigger a DTC that identifies that part, but triggers a DTC that sends you looking for a problem in the wrong system.

 

@Gunny

Didn't make a whole lot of sense to me but, the neighbors "new" 2005 Express van which had been in a sandwhich wreck would flicker the Stabilatrak light. When it would trigger the light the van would go into a"Limp Mode" type symptom with a bad stumble when you'd press the gas pedal to go. We got a code for the passengers side front Wheel Speed Sensor (WSS), so replaced it. Cleared up most of the problem, but would still on occasion do it's "Limp Mode" type symptom. and would also misfire at 45-50 MPH. Checked again for codes but nothing. Ordered both another WSS, and TPS. Replaced the drivers front WSS (Which was showing no code but the easiest to replace).

 

He's been driving it now for 2-3 weeks, and the problem is gone!