05 trailblazer stalling at idle

[deagle12]

My girlfriend's 05 TB with the 4.2l is stalling at idle about once a month. It happened again yesterday and there are no codes. Here's a list of what has been done to it this year:

TB cleaning
T stat replaced with new coolant (per code)
New motor mounts
New plugs

Any ideas for what to try next? It has 202k miles

 

[shovenose]

interested to see if you find a solution as i have this issue too. maybe check for vacuum leaks? 05 should have maf sensor, maybe clean it?

 

[Tiggerr]

If it's doing it at idle... for instance at a light, occasionally... and with the ac on... no-one's ever solved that issue...unless I missed it somewhere...

My 04 Rainier does it too... so did my wife's 04 Malibu that she'd bought new...even the dealer never could figure that out on the Malibu...

I chalk it up as a GM quirk...

 

[Redbeard]

Ours has been doing this for over 10 years. GM stealership was unable to find anything wrong. Any and all parts which commonly die which we read about on these threads I replaced often without any codes but to no avail. Whoever figures out this problems may retire comfortably should they want to sell their solution.

probably just a GM quirk
my 2¢
redbeard

 

[Mooseman]

When you cleaned the throttle body, did you disconnect the battery for 30+minutes?

 

[Redbeard]

"When you cleaned the throttle body, did you disconnect the battery for 30+minutes?"

regularly...but unfortunately to no help on the stalling issue

 

[Mooseman]

I'm also asking the OP.

 

[deagle12]

I'm also asking the OP.

Yes, and shortly after the battery got disconnected again for other services I was doing on it

 

[Mooseman]

If you have a bluetooth adapter and Torque, maybe check out your fuel trims.

 

[deagle12]

I was actually thinking about ordering one of those Bluetooth adapters. I'll get one soon and report back.