Bang after cold start?
Thread Starter
Burning Brakes
Joined: Oct 2001
Posts: 1,232
Likes: 2
From: Palm Desert CA
Bang after cold start?
Whenever I start driving in the morning (from a cold start) after about 3-5 mins there is a "bang" coming from the passenger side rear fender area. It only happens once and then not again for the rest of the day??? It sounds like an object hitting the hollow plastic inner fender.
I looked in the trunk storage areas and everything is secure, so I know it's not anything rolling around in there.
Has anyone else had this experience?
Any help would be greatly appreciated as I'd like to fix this problem before my last resort...taking it to the stealership
I looked in the trunk storage areas and everything is secure, so I know it's not anything rolling around in there.
Has anyone else had this experience?
Any help would be greatly appreciated as I'd like to fix this problem before my last resort...taking it to the stealership
Thread Starter
Burning Brakes
Joined: Oct 2001
Posts: 1,232
Likes: 2
From: Palm Desert CA
Burning Brakes
Joined: Oct 2005
Posts: 924
Likes: 161
From: Atwater CA
2024 C7 of the Year Finalist - Unmodified
Looks like you have a convertible. Maybe you have a problem with the automatic antenna? That's back there.... Run the antennae up, clean if off and lube it with silicone or something, just a suggestion 
Thread Starter
Burning Brakes
Joined: Oct 2001
Posts: 1,232
Likes: 2
From: Palm Desert CA
Thread Starter
Burning Brakes
Joined: Oct 2001
Posts: 1,232
Likes: 2
From: Palm Desert CA
Burning Brakes
Joined: Oct 2005
Posts: 924
Likes: 161
From: Atwater CA
2024 C7 of the Year Finalist - Unmodified
I was thinking maybe the antenna was sticking before it got to the top and then bang that last inch
The gas tank and the fuel pump is right behind the seats...
The gas tank and the fuel pump is right behind the seats...
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Thread Starter
Burning Brakes
Joined: Oct 2001
Posts: 1,232
Likes: 2
From: Palm Desert CA
. Luckily I have a GMPP warranty, if it comes to that!
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
Could it be something inside the fender well?
Its reasonably easy to take off the wheel and take out a few of the screws to get a flashlight in there and take a look. You can also get the rear taillight out in 5 seconds flat and see if theres anything loose in the antenna area.
This pic shows whats in there
Its reasonably easy to take off the wheel and take out a few of the screws to get a flashlight in there and take a look. You can also get the rear taillight out in 5 seconds flat and see if theres anything loose in the antenna area.
This pic shows whats in there
Last edited by DeeGee; Nov 5, 2007 at 01:34 AM.
Thread Starter
Burning Brakes
Joined: Oct 2001
Posts: 1,232
Likes: 2
From: Palm Desert CA
Could it be something inside the fender well?
Its reasonably easy to take off the wheel and take out a few of the screws to get a flashlight in there and take a look. You can also get the rear taillight out in 5 seconds flat and see if theres anything loose in the antenna area.
This pic shows whats in there
Its reasonably easy to take off the wheel and take out a few of the screws to get a flashlight in there and take a look. You can also get the rear taillight out in 5 seconds flat and see if theres anything loose in the antenna area.
This pic shows whats in there
Cheers mate!
Race Director
Joined: Oct 2004
Posts: 18,401
Likes: 3
From: Retired but working
Cruise-In VI Veteran
Check to see if you have a loose pipe hanger or perhaps the pipe is smacking the bottom of the car for so reason. Could be the initial torque causing the pipe to hit once.
Regards,
The Pup
Regards,
The Pup
Thread Starter
Burning Brakes
Joined: Oct 2001
Posts: 1,232
Likes: 2
From: Palm Desert CA
Pro
Joined: Jan 2001
Posts: 603
Likes: 0
From: Windsor, Ontario & Bradenton, Florida
Sounds like it may be heat related if it takes the same 3 to 5 minutes to happen which would indicate the exhaust system. May be a pipe or cat or muffler clamp. Kust a thought.
Thread Starter
Burning Brakes
Joined: Oct 2001
Posts: 1,232
Likes: 2
From: Palm Desert CA
.
Advanced
Joined: Jun 2007
Posts: 68
Likes: 0
From: Arlington Texas
I think what your hearing is what drove me crazy when I first got mine until I had my girlfriend drive while I sat in the passenger seat heard the thump. It was just the flap slamming open on the ac/ heater. When it goes from recirculate to fresh air after car detects outside temp. Hope this helps.
Instructor
Joined: Jun 2006
Posts: 148
Likes: 3
From: Fairfax Va
Another thought your parking brake could be sticking on one side, when things get warm enough it releases. If you can, try not using the parking brake and see if you still get the noise on the next start up.
Thread Starter
Burning Brakes
Joined: Oct 2001
Posts: 1,232
Likes: 2
From: Palm Desert CA
I think what your hearing is what drove me crazy when I first got mine until I had my girlfriend drive while I sat in the passenger seat heard the thump. It was just the flap slamming open on the ac/ heater. When it goes from recirculate to fresh air after car detects outside temp. Hope this helps.
Thread Starter
Burning Brakes
Joined: Oct 2001
Posts: 1,232
Likes: 2
From: Palm Desert CA