Traction control on during left turns only

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May 10, 2012 | 10:44 AM

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Racer

Joined: Jun 2004

Posts: 390

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From: Cincinnati OH

Traction control on during left turns only

So for the past few weeks my corvette has the traction control kick on when making left hand turns. If I'm on a sweeping on-ramp, turning onto a street, or even turning into a parking spot the traction control will come on and you can feel the car shudder. Sometimes it will briefly kick up the "service traction system" message on the DIC. The shuddering stops as soon as I point the wheel straight again. The dealership just called and said they couldn't reproduce it, and didn't see any stored codes. Has anyone run into this problem before and give me pointers? I may head down and show them how I can replicate it if they can't their next time out. Thanks!

2008 c6 1lt z51 - no telescoping wheel

Could it be the battery? I heard weird things happen with the battery, but I imagine that wouldn't limit it to left turns. Any help appreciated!

May 10, 2012 | 12:32 PM

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Racer

Joined: Jun 2004

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From: Cincinnati OH

I know it hasn't been posted very long, but anyone have any ideas? They just called again so I may have to go down there and demo it to them.

May 10, 2012 | 02:22 PM

Gearhead Jim

Team Owner

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From: Far NW 'burbs of Chicago

St. Jude Donor '13

If the clutches in your limited slip (positraction) differential are really sticking, that might confuse the TC or AH.

If you turn TC/AH completely off, do you get any chattering/snapping/binding, while making a turn? Not the usual tire scrubbing from the fronts, but something similar from the rears?

May 10, 2012 | 02:52 PM

jft69z

Drifting

Joined: Nov 2011

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From: western NY

Could be a bad ABS sensor/wheel bearing assembly. Any decent shop with a graphing scanner can troubleshoot it for you. I usually set it up for a 2 or 4 graph view, take it for a ride & compare the individual wheel traces. If there is a bad wheel sensor, it will be pretty obvious as it will drop out or make wierd traces compared to the other wheel signals. Are there any stored ABS codes? "Service Traction System" indication is a hint here as well. A damaged ABS sensor harness is possible too, there again, the test ride with a scope will point you in the right direction.

Last edited by jft69z; May 10, 2012 at 02:56 PM.

May 10, 2012 | 08:21 PM

johnnycaker

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Maybe it's set up for Nascar

May 11, 2012 | 12:23 AM

Bill Dearborn

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From: Charlotte, NC (formerly Endicott, NY)

Quote:

Originally Posted by jft69z

Possible but not probable. If the sensor was messing up the TC the Service ABS and AH messages would have been displayed and probably a history code in the EBCM.

Bill

May 11, 2012 | 03:36 AM

jft69z

Drifting

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From: western NY

Quote:

Originally Posted by Bill Dearborn

Possible but not probable. If the sensor was messing up the TC the Service ABS and AH messages would have been displayed and probably a history code in the EBCM.

Bill

Unfortunately, there's no way of knowing for sure without actually troubleshooting the problem. It's guesswork until then.

May 11, 2012 | 08:08 AM

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Racer

Joined: Jun 2004

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From: Cincinnati OH

Problem solved, tell me what looks wrong here.

Under normal conditions the spark was jumping the gap. Under left turns the centrifugal force drove the plug wire away from the valve cover and the spark stopped.