Diagnose this? Flighty under acceleration
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Joined: Oct 2007
Posts: 68
Likes: 1
From: San Carlos CA
Someone is just telling me not to go to Nationals....
I let Dave drive the car this morning, he found it to be very weird as well so I got home and jacked up the rear end. Went about tightening things down. I found a connection unplugged on the passenger side, I cleaned it up and plugged it back in. Not sure which connector that is?
After that I tried tightening up things under the car, and ended up breaking one of the bolts on the rear diff mount where it goes to the subframe
In the photo above it was the bolt on the bottom left of that picture (picture not of my car).
So I am done, I'm taking it to a dealer in the morning and giving them my credit card. Hopefully they have it fixed by Wednesday and without maxing out my card
I let Dave drive the car this morning, he found it to be very weird as well so I got home and jacked up the rear end. Went about tightening things down. I found a connection unplugged on the passenger side, I cleaned it up and plugged it back in. Not sure which connector that is?
After that I tried tightening up things under the car, and ended up breaking one of the bolts on the rear diff mount where it goes to the subframe
In the photo above it was the bolt on the bottom left of that picture (picture not of my car).
So I am done, I'm taking it to a dealer in the morning and giving them my credit card. Hopefully they have it fixed by Wednesday and without maxing out my card
Thread Starter
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Joined: Oct 2007
Posts: 68
Likes: 1
From: San Carlos CA
The local dealer says I need to replace all the control arms in the back of the car, so I am picking it up today and taking it to Superior Chevy thursday morning on my way to Topeka to have them replace the parts. Here's to hoping that solves the problem!
Melting Slicks
Joined: Aug 2004
Posts: 2,237
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From: Springhill FL
I had this same problem after one of my many driveline jobs. Was driving me nuts. Was driving along and heard a loud "Clank, ting ting ting" Pulled over to find one of my rear control arm bolts on the road. 
Either I forgot to tighten it or forgot the locktite on it and it backed out. Got it home and put bolt back in and car drove like new 
I would imagine worn out bushings causing the same feeling. I cant see the control arms being bent though. That kind of cast aluminum would normally break rather than bend.
Either I forgot to tighten it or forgot the locktite on it and it backed out. Got it home and put bolt back in and car drove like new I would imagine worn out bushings causing the same feeling. I cant see the control arms being bent though. That kind of cast aluminum would normally break rather than bend.
Last edited by MawneeC5; Sep 9, 2008 at 10:25 PM.
Burning Brakes
Joined: Nov 2006
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From: Goose Creek SC
Thread Starter
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Joined: Oct 2007
Posts: 68
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From: San Carlos CA
That's a lot of runs!
Last edited by christoc; Sep 10, 2008 at 12:47 AM.
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Burning Brakes
Joined: Nov 2006
Posts: 1,071
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From: Goose Creek SC
Correct, I also have autocrossed a LOT this year, I've travelled to a lot of national events. I just did some quick math and I believe I've had somewhere around 133 autocross runs this year myself (not included a T&T day at Topeka in August), with codrivers the car has seen almost another 200 runs.
That's a lot of runs!
That's a lot of runs!
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Joined: Oct 2007
Posts: 68
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From: San Carlos CA
Holy crap I am an idiot.
For future reference....
If you put an 18" tire on the front and a 17" tire on the rear (other side of the car has 17F 18R) the car goes to hell. Swap them and all is well again.
I can't believe I didn't see this, or the first dealer didn't see this. Talk about an expensive screwup.
For future reference....
If you put an 18" tire on the front and a 17" tire on the rear (other side of the car has 17F 18R) the car goes to hell. Swap them and all is well again.
I can't believe I didn't see this, or the first dealer didn't see this. Talk about an expensive screwup.
Instructor
Joined: Oct 2007
Posts: 214
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I just had to chuckle at the resolution... and give this resolution a bump.
But I also wonder... I thought the overall OD of the tires front and rear was the same or close. Maybe it's enough that it was causing the AH to kick in when the narrow tire started to break loose?
At least you didn't wreck it! ;-)
bob