sinecter

So I bought this car off a dude. He had 17s on it and said he had disabled the tcs (by pulling fuse) because it kept going off w/ the 17s, but he had no problem on stock 18s. So today I put the stock 18s back on and put the fuse back in and reset the ECU. The brake and ABS light turned off, but whenever I turn w/o breaking all my breaks kick in and slow me down. Checked under the car found that a bolt from the tortion/roll bar was missing. Replaced it and still same. Any suggestions? Does it take time for the system to "recalibrate" no CEL or any other lights on. The VDC button does nothing, so maybe the module is bad?

terrasmak

iTrader: (8)

What tires (size are mounted) on your wheels

sinecter

Front 225/45R18 Rear 245/45R18

350ZTheStandard

iTrader: (4)

I believe the outside diameters of the front & rear tires need to be > 1 inch of each other or you will have the slip light come on, even at low speeds.

DavesZ#3

iTrader: (26)

Those are the correct OEM sizes for the 18" wheels.

Nope, ideally you want the stagger to be between 0.25 and 0.75". In this case it doesn't matter because he has the correct OEM size.

DavesZ#3

iTrader: (26)

It sounds like he put the wrong size tires on with the 17s but since you've returned to OEM 18s and the problem still exists, he may have had problems far beyond just wrong sized tires initially.

The symptom you describe is the classic example of wrong size tires which you don't have. If VDC/SLIP came on all the time, then I'd guess you have problems with a wheel speed sensor or the ABS/TCS/VDC control module. It could be a problem with the G-sensor that is part of the VDC system, or it could be a problem with the steering angle sensor.

Usually when somebody pulls the fuse, that kills ABS/TCS/VDC and the brake lights so I'm not 100% sure of what fuse he pulled and you replaced. He may have also disconnected the G-sensor as that is a method of disabling it. The G-sensor is under the console. I assume you've talked to him to find out exactly what he did, correct?

I'd take it to a dealer and get them to run the diagnostics on it.

theleonard350z

iTrader: (10)

I have had the same problem with my Z as well, i have 245/45/19F and 275/35/19R. i did not have any problems with the traction contol with the stock wheels. somtimes will be going as slow as 20 mph around a curve and the traction control kicks right in for no reason. i just turn it off now everytime i drive...

DavesZ#3

iTrader: (26)

No, you have a totally different problem. You have the wrong size tires on the car. Please read this post...

https://my350z.com/forum/4936171-post42.html

sinecter

Sorry for the long responses. But today I took the center console/arm rest apart and looked at the g-sensor. It appears to be hooked. I unplugged it and replugged it. I also did a overnight unplug of the battery. After 6 miles of driving it still does it. But still no "slip" lights come on neither does the "VDC off" after I press the VDC button.