I'm an old guy with most of my experience on cars pre 1975 so the new ones are a challenge. I have a 2007 4.2 inline Trailblazer with abt. 72k miles. Symptoms are, usually under 5mph when stopping the ABS kicks in, seems to be one problem. After consulting the forums, I have removed, cleaned all surfaces & re-installed all 4 ABS wheel sensors.
Second condition is, when starting from a dead stop the stabilitrak light comes on & the engine sounds like it may stall. This only lasts for 1 -2 seconds then light goes out & engine runs normal. Now this problem seems to happen most frequently on the first trip of the day (but on occasions at other times). Back out of my driveway, put it in D start to pull away & that's when in occurs. If I disable the Stabilitrak as soon as I start the car I don't have a problem with the Stabilitrak. (for the sake of full disclosure). Went to Autozone & their code reader found no codes.
Note: I disconnected the front drivers side ABS sensor & both problems went away. (Made a 200 mile trip with it disconnected & no problems). Replaced that ABS sensor, reconnected it & both problems returned.
Question: If I disconnect one (any) wheel ABS sensor does it disable the entire ABS system & the Stabilitrak system or just the signal from that one wheel? An answer to this question & that will help in my trouble shooting.
Passenger side wheel hub/assy replaced at abt. 63k miles.
Am considering, 1. Buying one rear wheel ABS sensor & swap out one rear wheel ABS sensor, if that doesn't fix the problem on one wheel then swap with other wheel sensor. If that doesn't fix it then. 2. buy second rear wheel ABS sensor. If that doesn't fix it then, 3. replace driver side front wheel hub/assy. As of now I have no obvious bad wheel bearing signs but I have read that there can be a delay between symptoms I have & bad wheel bearing symptoms.
Before proceeding any further will greatly appreciate any advice/suggestions.
Second condition is, when starting from a dead stop the stabilitrak light comes on & the engine sounds like it may stall. This only lasts for 1 -2 seconds then light goes out & engine runs normal. Now this problem seems to happen most frequently on the first trip of the day (but on occasions at other times). Back out of my driveway, put it in D start to pull away & that's when in occurs. If I disable the Stabilitrak as soon as I start the car I don't have a problem with the Stabilitrak. (for the sake of full disclosure). Went to Autozone & their code reader found no codes.
Note: I disconnected the front drivers side ABS sensor & both problems went away. (Made a 200 mile trip with it disconnected & no problems). Replaced that ABS sensor, reconnected it & both problems returned.
Question: If I disconnect one (any) wheel ABS sensor does it disable the entire ABS system & the Stabilitrak system or just the signal from that one wheel? An answer to this question & that will help in my trouble shooting.
Passenger side wheel hub/assy replaced at abt. 63k miles.
Am considering, 1. Buying one rear wheel ABS sensor & swap out one rear wheel ABS sensor, if that doesn't fix the problem on one wheel then swap with other wheel sensor. If that doesn't fix it then. 2. buy second rear wheel ABS sensor. If that doesn't fix it then, 3. replace driver side front wheel hub/assy. As of now I have no obvious bad wheel bearing signs but I have read that there can be a delay between symptoms I have & bad wheel bearing symptoms.
Before proceeding any further will greatly appreciate any advice/suggestions.