: After 74 mph carputer says traction engaged and i get loss of power



KING03
06-27-11, 02:54 PM
2005 CTS-V After 74 mph carputer says traction engaged and i get loss of power. what can this be?

Twitch
06-27-11, 03:22 PM
Too much power, ease up on the throttle.
J/K
What tire sizes you running? Have you tried turning off traction control?

Claimslngr
06-27-11, 05:58 PM
Twitch is right, check your tire sizes it sounds like the tires are of different diameter. The other cause could be a bad tpms, (no then it should happen all the time) nope still with Twitch!

KING03
06-27-11, 06:53 PM
yeah the tires are used diffrent brands and sized 240/40/18, just bought it yesterday ,going to put new tires on it today. I tried driving it without TC on but just dont like the feel.

Claimslngr
06-27-11, 07:42 PM
Can't remember the amount of difference percentage wise you can have, but it's not a lot. You have to check outside diameter to mix brands or sizes, maybe someone can chip in the amount of difference you can have.

Good Luck

Twitch
06-28-11, 09:27 AM
yeah the tires are used diffrent brands and sized 240/40/18, just bought it yesterday ,going to put new tires on it today. I tried driving it without TC on but just dont like the feel.

240/40 is tiny, but that's just my opinion. Is that what your mounting all around, or what you have on there now?
If it doesn't do it with TC off then it should be your tires.

Skidmarcx
06-28-11, 09:30 AM
I agree on the tires... going 74 the difference in tire diameter makes enough difference, so there is a discrepancy in the wheel speeds

tweeter81
06-28-11, 01:47 PM
It's more likely probably the wheel speed sensor going bad. Does it feel like the brake is slightly being applied to one wheel when the "Stability System Engaged" message comes up?

AAIIIC
06-28-11, 05:16 PM
240/40 is tiny
And doesn't exist. :p


yeah the tires are used diffrent [sic] brands and sized 240/40/18
245/40-18? There's no such thing as a 240/40. Stock size is 245/45-18, so if you're putting new tires on it, get the proper size.


I tried driving it without TC on but just dont like the feel.
:confused: It should feel exactly the same, unless you're spinning the tires continuously until you hit 74mph.

KING03
06-28-11, 07:20 PM
Could be me feeling freaked out with it off, yeah its 245/40 on one and 245/45 on the other, going to get all new wheels tomorrow, so i'll go from there and keep you guys posted

kevm14
06-28-11, 09:55 PM
And there's your problem. You should be fine with proper sized tires all around. I'll never understand why people are incapable of using a simple tool like this to figure outer tire diameter (not the OP, but whoever put those tires on his car):

http://www.miata.net/garage/tirecalc.html

KING03
06-29-11, 02:05 PM
yeah bought the car like that and already new i needed new tires, but don't know much about cadillacs thats why its nice to have help from a forum.

tweeter81
06-29-11, 02:29 PM
And there's your problem. You should be fine with proper sized tires all around. I'll never understand why people are incapable of using a simple tool like this to figure outer tire diameter (not the OP, but whoever put those tires on his car):

http://www.miata.net/garage/tirecalc.html

I have run tires that are as much as 5% different (smaller overall diameter) than stock and had no problems with the Stability system. GM obviously allows a little leeway in the system for people to change tire sizes. When you go up-size in width, you can't always find the exact O.D. that matches stock (especially if you are trying to get a certain tire brand or type).

On a side note, when I had my car tuned, the shop reduced the amount that the TC and Stability intervenes when it's on in my car, so that could be part of the reason why I had no issues with a 5% difference in O.D.

KING03
07-10-11, 05:35 AM
new tires solved the problem

Twitch
07-10-11, 11:22 AM
Thanks for the update. So many threads drop of without answers.

AAIIIC
07-10-11, 06:14 PM
Good news.