Cavalier - ABS, Trac Off, and Service Wrench

My 2003 Cavaliar does this just about every morning, start it up put it reverse and back up it will miss , and then the low trac comes on, then shift to drive and , the trac off/abs and wrench light comes on, at times it wont , miss and all is fine, tect 2 reads right hub turning faster then left??, same size tires, replaced hub a few months ago, was loud and wore out, some times it will miss at a red light when taking off, then the low trac and abs and wrench light will come on, i dont know where to starat ???????

When you say miss, are we talking misfire? If yes, does it misfire under a load on the highway, for example, going up a slight grade at 50-55mph, and you lightly accelerate?

Also are you familiar with the traction control on this vehicle? Different systems accomplish traction control in different ways......if a wheel slips, the computer could shift the vehicle to second gear(reduce torque), could kill injector(s), adjust timing, etc.....Check your owner's manual to see how this is accomplished.....

If the ABS light is on, a code is set....if the rim and tires are the same(also approximately worn the same, meaning you don't have a new one on one side, and a worn one on the other)......I ran into a couple of cases where, both front tires were the same size, but different brands, and caused a problem with the speed sensor due to the difference in circumference......the difference in circumference can cause the speed sensors to read differently....if this is not the case, might be a bad hub assembly or one that is out of spec....

when i say a miss no its not under load, it runs fine going down the highway, and is smooth running, its when i put on brake and shift into gear to back up, i get the miss then the low trac, then when i shift into drive it has trac off/abs and wrench light, they stay on, now whats crazy, is if i back it in and start it next time i drive it, its ok, ( seems like this is a reveise thing, ) but oksay i back it in, start it go to drive drive to work, sometimes when iam at a light with back on , and let off give it gas, it will miss/hasatate and then u get the same low trac, then trac off /abs/ wrench
i have replaced the hub asemmbly could i have got a bad one?? this didnt start all this until a week or so after hub change , it never missed before then,

You need a scan tool capable of reading ABS codes and data, to see what is going on....

I am still fighting this, here is what i got after getting code read , replaced ABS senscor, as it read bad, it fixed it for about 3 days, same , as when i cleaned it off , it fixed it for 3 days,
Ok, it keeps getting worse, hard to explain but here goes,
start it up in the morning , or after work, or anytime, put it in revearse, i get a miss, not a miss fire , a miss , the low trac light comes on, put it in drive and i get ABS/ TRAC OFF AND SERVISE SOON LIGHT , THAT STAY ON, now it just started , doing this also, you can feel it and hear it sounds like the ABS is going off, keep in mind i dont even have foot on brake, it will do this for say 5 sec. or so, then when you hit brakes it will do it also, ( BTW all new rotors and best pads you can get ) it will also do the pulsating of the brakes when turning right , not left just right , ??? is there a senscor on the trans for the trac, bad maybe??, went back and read codes and keeps saying right side ABS senscor bad ?? i will try to discrabe all what it does as best i can, this thing does some strange things, and ABS goes off when it wants.

You still did not tell us what the code is......

A code does not name a specific part is at fault......it just tells you what circuit is at fault.....that means anything in the circuit......

For example, if a code is set that involves the RF sensor, it doesn't mean that it is the RF sensor.....it means anything in the circuit.....that means the speed sensor, the ABS module, or the wiring in between......

The fact this happens while shifting or turning, could possibly be a harness problem......

I had it read @ advanced auto and they just told me the speed sensor showed bad, i replaced that, it puzzles me, because, the ABS is working when brake isnt being used, and there is no trac loss, , i did replace a right hub, but it took a few weeks after for all this to start doing this, when i would clean the speed sensor off , it would be fine for about 3 to 4 days, ???? i plan on getting it scanned again, and will see if they can give me numbers