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The major problem with increasing tire size on the Envoy is at the front wheel assembly. The upper ball joint is very close to the tire, even with standard size tires. Go to www.trailvoy.com and do a search on tire size, I believe someone posted a chart of tire sizes for fit with different years of Envoy and Trailblazer.
if u have a grand am gt--gt1--[se1--se2 w touring package]stock tire size 225/50/r16 [16 inch rims] if urs is a se--se1--se2 stock tire size is 205/65/r15 [15 inch rims]
1st number is tread width (mm)265
r =speed rating
2nd is wheel size, in inches 16
the rule of thumb re tread width, is the tread should not exceed the inner wheel width,measured inside the wheel/tyre sealing area by more then 20mm.
otherwise car will tend to sway when steered for moose test.so check your wheels first...
r rating only good upto 100 mph intermitently...
If you have recently bought new tires and the size is larger or smaller than the stock tire size, it will throw off the ABS as the computer thinks the tire is not running at the correct programmed rpm in relation to the overall truck speed. Check with a local tire shop to have it checked.
your code is PCM/ECM power input signal intermittent. this is ussually a sign of a bad connection whether it be in a connector or a short or brake in a wire.
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