'05 STS - Slipping Transmission at low MPH

[freshchops]

Hey, first time here!

I'm driving an '05 STS (V8), 1SG performance, Auto transmission with right under 50k miles.

I'm noticing more and more that it feels the transmission is slipping, or giving out on me only while going between about about 25-35 MPH, and strangely enough, only noticable within those speeds. I'm not very knowledgeable about mechanics and all, but kind'a has a feeling like slipping transmission.

Any huntches as to what could be causing this. I'm also thinking something along the lines of a Timing Belt?

Also, does this sound like something covered by the GM warranty... even at the point of it being suspicious or does the engine need to drop out first?

Thanks for any input, I'd be glad to throw out more details if the question seems to bleek.

Thanks!
C

[caddydaddy]

Before I'd even look at it, I'd take it in and have Cadillac look at it for free using the factory 4 year or 50,000 mile warranty! Just be sure you get it in before you hit 50k, or you're SOL!

[AJxtcman]

3.6L ?

[clarkz71]

Originally Posted by freshchops

Hey, first time here!

I'm driving an '05 STS (V8), 1SG performance, Auto transmission with right under 50k miles.



Thanks!
C

Originally Posted by AJxtcman

3.6L ?

You got me scratching my head AJ.

[AJxtcman]

Originally Posted by clarkz71

You got me scratching my head AJ.

I read the title and looked up the bulletin to make sure it was just 3.6L and it is. Then I posted the question without reading his post.

[clarkz71]

Why does he say V-8?

[freshchops]

OK, I'm confussed.....

It is a '05 STS, Northstar 4.6L V-8, Auto transmission.

What's so confussing about that? Did I say 3.6L ? ...... I say "V-8", as opposed to V-6..... that other engine they come with.

Did I post this in the wrong forum?

[caddydaddy]

Originally Posted by freshchops

OK, I'm confussed.....

It is a '05 STS, Northstar 4.6L V-8, Auto transmission.

What's so confussing about that? Did I say 3.6L ? ...... I say "V-8", as opposed to V-6..... that other engine they come with.

Did I post this in the wrong forum?

I'm confused too! It's a bunch of posts irrelevant to your transmission problem. You posted in the correct forum for the Northstar engine.

Did you talk to the Cadillac dealer yet?

[clarkz71]

That's why I kept asking AJ why he said 3.6. The guy said V-8.
I don't know where he got 3.6

[urbanski]

Originally Posted by freshchops

Did I post this in the wrong forum?

no you didnt, you're fine and i dont know what went wrong here.
however i will copy this thread to the STS 05+ forum.
http://www.cadillacforums.com/forums...n-low-mph.html

[AJxtcman]

Originally Posted by clarkz71

That's why I kept asking AJ why he said 3.6. The guy said V-8.
I don't know where he got 3.6

The 3.6L have a known chuggle. I have seen quite a few.
.
.
It would be like an 00 deville stalling when pulling off the freway = Crank sensor.
.
.
STS chuggle/surge below 40mph = TCC issue. 3.6L only.
.
.
just habit.

[freshchops]

After talking to my brother who works on cars in spare time and his father in-law who rebuilds Caddy's... he's eased my mind a little. He's basically summarized it as a slight glitch in an electronic based automatic transmission. It's hitting a tricky speed where it doesn't really know what to do; preparing to downshift / preparing to upshift. since it's electronic, it's programed for an intricate speed to make the shift, if you are coasting along at this tricky speed, it goes haywire......

I've narrowed it down to going about 29 MPH steadily. Fortunately, I don't go 29 MPH very much.... at all (mwuuuhaha), but still. And even if it is a nonspecific trans. goofy spot, it still makes me kinda nervous. I can't imagine them all rolling off the lot like that.

Maybe it needs to be tuned, I'm not sure. I did just have my 60,000 mile factory service done though and it wasn't noticed or mentioned, although I don't know if they'd look for that.

Thanks