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Klunk from a stop


clucas6308

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Hi to everyone,

I get a bit of a klunk when I take off from a stop and worse foward to reverse, Hmmmm...like, when stuck in MI snow, feels like a bad universal joint would feel in a rear wheel drive car. CV joint?... tranny? I thought CV's klunked on a hard turn.

Thank everyone for any help,

Chris

2002 Seville STS 114,000

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It may well be a bad CV joint, but

I had that with a bad front engine mount, if you get under there you may see it cracked. Have a look at your engine mounts

Here is a photo of a bad front mount

WaterPumpenginemount8.jpg

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Hi to everyone,

I get a bit of a klunk when I take off from a stop and worse foward to reverse, Hmmmm...like, when stuck in MI snow, feels like a bad universal joint would feel in a rear wheel drive car. CV joint?... tranny? I thought CV's klunked on a hard turn.

Thank everyone for any help,

Chris

2002 Seville STS 114,000

I agree with BBF. in addition, you might want to check your wishbones.

with the car in park, emergency brake on. put the car in drive, and then reverse. do you hear any noise? have the hood open, and check out for any excessive movement of the engine (paying close attention to the wishbones.

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First, Thanks for the help, I opened the hood and shifted reverse to drive, with foot on brake, parking brake auto released, anyway, the engine did jump about an inch, so, I raised the car and located the front mount and it looks like one on either side in the wheel wells hard to find the rear. Due to torque direction is it usually one or the other or just replace both? After I find the rear one. Shade tree job or bring it in?

Thanks,

Chris

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Your ENGINE/TRANSMISSION has a total of 4 mounts, you are seeing 2 of them on the LEFT AND RIGHT, here are your mounts

Front Engine mount

2003EngineMountFront.gif

Right Engine Mount

2003EngineMountRight.gif

Left Transmission Mount

2003TransmissionMountLeft.gif

Rear Transmission Mount

2003TransmissionMountRear.gif

I had to replace my LEFT Transmission mount and my FRONT ENGINE mount, the FRONT mount made a HUGE difference and removed the clunking on takeoff. All of your mounts should be inspected, especially the front and rear mounts

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Thanks Everyone, will be changing motor mounts all 4.

Is it just me or do you pull over in the next parking lot the second the ses light comes on?

SES light may scare anyone. Nevertheless, remember that you can drive for months with SES light on. All depends on the cause. I always keep a list of trouble codes in my glovebox.

The saddest thing in life is wasted talent

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Thanks Everyone, will be changing motor mounts all 4.

Is it just me or do you pull over in the next parking lot the second the ses light comes on?

Oh good, they look easy enough to change on your car, I changed my front mount in the driveway it was much easier than I thought.

You didn't say, did you find a definate crack or split in any of your mounts?,

I don't want you to run with our diagnosis and make a mistake. Parts replacing is not an efficient way to nail a problem, make sure you determine that you are having a mount problem. I would get under there and inspect them, replacing all four is not cheap or necessary. As you know the front mount takes a lot of stress on acceleration, so we see them go, but I'd inspect them and replace as necessary.

As Adallak mentioned the SES can be a host of issues that can be put off till your next convenient stop to check. Unless there are serious driveability problems, I cross my fingers and check mine at the first opportunity, right now my Monte Carlo has a CEL and its a bad O2 Sensor, and sucking fuel as a result, because its not going into closed loop.

It has been on for about two months, I should replace it soon the rich mixture is going to damage my CAT

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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