Accident, then severe rear wheel hop.
12-17-2014, 12:13 PM
#1
Melting Slicks
Thread Starter
Accident, then severe rear wheel hop.
I drove my C7 (Z51, MSRC) off a high curb at about 15 mph. I just didn't see it. The car took a pretty good blow. The right rear quarter quarter panel was pulled loose in front of the rear bumper and peeled forward about 30°. The strip under the passenger door was scraped clean of paint the entire length of the door. It took two bottles of touch paint to cover it up. Now I have severe rear wheel hop at low speed. I get on the gas in first and second at up to 25 mph and the rear wheels hop up and down violently. I can't put the power to the ground. I figure something must be broken in the rear suspension. My local Chevy dealer has had the car for a whole day and can't find the problem. I gave my service writer a ride yesterday morning, so he understands the nature of the problem. Any ideas?
12-17-2014, 12:19 PM
#3
Moderator
Well, depends on what your road temps are. Now that it has gotten cooler, the rear tires just don't grab like they do at warmer temps. The result is a lot more wheel hop under somewhat aggressive acceleration.
12-17-2014, 12:29 PM
#4
Pro
I drove my C7 (Z51, MSRC) off a high curb at about 15 mph. I just didn't see it. The car took a pretty good blow. The right rear quarter quarter panel was pulled loose in front of the rear bumper and peeled forward about 30°. The strip under the passenger door was scraped clean of paint the entire length of the door. It took two bottles of touch paint to cover it up. Now I have severe rear wheel hop at low speed. I get on the gas in first and second at up to 25 mph and the rear wheels hop up and down violently. I can't put the power to the ground. I figure something must be broken in the rear suspension. My local Chevy dealer has had the car for a whole day and can't find the problem. I gave my service writer a ride yesterday morning, so he understands the nature of the problem. Any ideas?
Since there doesn't appear to be anything visual you can see damaged, try pulling the fuses/circuit breakers, if that's possible, one at a time, for the traction control system, electronic parking brake, and the electronic posi rear axle, and see one of them might eliminate it. Just a wild guess because it sounds like something is engaging electronically at a certain speed.
12-17-2014, 02:47 PM
#7
Melting Slicks
Thread Starter
I was hoping to get some ideas as to what might be wrong here. I'm not getting much to go on.
12-17-2014, 03:47 PM
#8
Pro
No luck disabling the various electronically controlled systems that might not be reading a fault and think they're working properly but really not?? I'm all for computer controlled systems, but sometimes they can fool themselves and we pay the price!! When nothing is visibly wrong, that's always my next go-to thing...
12-17-2014, 04:36 PM
#9
Safety Car
Member Since: Oct 2012
Location: Austin Texas
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St. Jude Donor '15
It sounds as though there is a shock problem. I'm not a genius on suspension problems, but have seem similar problems over the years on other cars. If travel is disrupted it might cause the wheel(s) to hop when there is enough power added. I would find someone in your area who is good with setting up suspensions in sports cars and see what they think. If it is not obvious the dealer may not have the talent or skill at their shop to deal with this issue. Good luck on the fix.
12-17-2014, 05:09 PM
#10
It sounds like the damage was only on one side. Is the wheel hop just on that side, or on both sides?
Did they check the alignment? It's unlikely part of the suspension could be badly damaged without affecting the alignment.
Does the car have MSRC?
Did they check the alignment? It's unlikely part of the suspension could be badly damaged without affecting the alignment.
Does the car have MSRC?
Last edited by WelderGuy; 12-17-2014 at 05:11 PM.
12-17-2014, 05:20 PM
#11
Melting Slicks
Thread Starter
It sounds like the damage was only on one side. Is the wheel hop just on that side, or on both sides? BOTH SIDES
Did they check the alignment? It's unlikely part of the suspension could be badly damaged without affecting the alignment. ALIGNMENT OK
Does the car have MSRC? YES
Did they check the alignment? It's unlikely part of the suspension could be badly damaged without affecting the alignment. ALIGNMENT OK
Does the car have MSRC? YES
12-17-2014, 05:23 PM
#13
Melting Slicks
Thread Starter
12-17-2014, 06:07 PM
#14
Race Director
sounds like you bent an aluminum suspension link/component. bring it in and get it checked. bet alignment is out in rear due to the crash..
12-17-2014, 07:20 PM
#15
Melting Slicks
Member Since: Mar 2006
Location: Land of the free, home of the brave...
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Random thoughts.
What happens if you start off agressively in 3rd gear? Remember the transmission is in the rear - could there be internal damage?
Did only the rear take a hard "hit"? Is there damage to the torque tube aka drive shaft?
What is happening at higher speed - vibration? Are one or wheels out of balance ?
Is there internal damage to one of the rear shocks?
Long shot - is there something towards the front that could be causing this?
What happens if you start off agressively in 3rd gear? Remember the transmission is in the rear - could there be internal damage?
Did only the rear take a hard "hit"? Is there damage to the torque tube aka drive shaft?
What is happening at higher speed - vibration? Are one or wheels out of balance ?
Is there internal damage to one of the rear shocks?
Long shot - is there something towards the front that could be causing this?
12-17-2014, 07:20 PM
#16
OP…The comment above about lower temperatures and wheel hop on hard acceleration should be seriously considered. My Stingray would hop violently when the temperature dropped below 45 to 50°, on aggressive acceleration in lower gears, even with all electronic nannies turned on. For a while, I was firmly convinced there was something wrong with the car.
Has there been a temperature change of significance since the accident? There is the distinct possibility that there is nothing whatsoever wrong with your car.
Has there been a temperature change of significance since the accident? There is the distinct possibility that there is nothing whatsoever wrong with your car.
12-18-2014, 05:51 PM
#17
Melting Slicks
Thread Starter
Random thoughts.
What happens if you start off agressively in 3rd gear? Remember the transmission is in the rear - could there be internal damage? NOTHING, ONLY LOW SPEED.
Did only the rear take a hard "hit"? NO, ENTIRE CAR.
Is there damage to the torque tube aka drive shaft? I DON'T KNOW.
What is happening at higher speed - vibration? Are one or wheels out of balance ? NOTHING.
Is there internal damage to one of the rear shocks? I DON'T KNOW. THE DEASLER HAD IT FOR THREE DAYS AND COULDN'T FIND ANYTHING.
Long shot - is there something towards the front that could be causing this? NOTHING APPARENT.
What happens if you start off agressively in 3rd gear? Remember the transmission is in the rear - could there be internal damage? NOTHING, ONLY LOW SPEED.
Did only the rear take a hard "hit"? NO, ENTIRE CAR.
Is there damage to the torque tube aka drive shaft? I DON'T KNOW.
What is happening at higher speed - vibration? Are one or wheels out of balance ? NOTHING.
Is there internal damage to one of the rear shocks? I DON'T KNOW. THE DEASLER HAD IT FOR THREE DAYS AND COULDN'T FIND ANYTHING.
Long shot - is there something towards the front that could be causing this? NOTHING APPARENT.
12-18-2014, 05:53 PM
#18
Melting Slicks
Thread Starter
OP…The comment above about lower temperatures and wheel hop on hard acceleration should be seriously considered. My Stingray would hop violently when the temperature dropped below 45 to 50°, on aggressive acceleration in lower gears, even with all electronic nannies turned on. For a while, I was firmly convinced there was something wrong with the car.
Has there been a temperature change of significance since the accident? IT HAPPENS AT ALL TEMPERATURES, INCLUDING 90°+. There is the distinct possibility that there is nothing whatsoever wrong with your car. NO THERE ISN'T.
Has there been a temperature change of significance since the accident? IT HAPPENS AT ALL TEMPERATURES, INCLUDING 90°+. There is the distinct possibility that there is nothing whatsoever wrong with your car. NO THERE ISN'T.
12-18-2014, 06:44 PM
#20
Le Mans Master
Maybe I missed it above, but have they put it on the alignment rack yet?